diff --git a/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.spvasm.expected.fxc.hlsl b/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.spvasm.expected.fxc.hlsl
index 98a6605..8944e7d 100644
--- a/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.spvasm.expected.fxc.hlsl
+++ b/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.spvasm.expected.fxc.hlsl
@@ -1,4 +1,4 @@
-SKIP: FAILED - TIMEOUT
+SKIP: FAILED - crbug.com/tint/1375
 
 void set_scalar_float2x3(inout float2x3 mat, int col, int row, float val) {
   switch (col) {
@@ -177,236 +177,545 @@
   m43 = float4x3((0.0f).xxx, (0.0f).xxx, (0.0f).xxx, (0.0f).xxx);
   m44 = float4x4((0.0f).xxxx, (0.0f).xxxx, (0.0f).xxxx, (0.0f).xxxx);
   i = 0;
-  {
-    [loop] for(; (i < 1); i = (i + 1)) {
-      i_1 = 0;
-      {
-        [loop] for(; (i_1 < 1); i_1 = (i_1 + 1)) {
-          i_2 = 0;
-          {
-            [loop] for(; (i_2 < 1); i_2 = (i_2 + 1)) {
-              i_3 = 0;
-              {
-                [loop] for(; (i_3 < 1); i_3 = (i_3 + 1)) {
-                  i_4 = 0;
-                  {
-                    [loop] for(; (i_4 < 1); i_4 = (i_4 + 1)) {
-                      i_5 = 0;
-                      {
-                        [loop] for(; (i_5 < 1); i_5 = (i_5 + 1)) {
-                          i_6 = 0;
-                          {
-                            [loop] for(; (i_6 < 1); i_6 = (i_6 + 1)) {
-                              i_7 = 0;
-                              {
-                                [loop] for(; (i_7 < 1); i_7 = (i_7 + 1)) {
-                                  i_8 = 0;
-                                  {
-                                    [loop] for(; (i_8 < 1); i_8 = (i_8 + 1)) {
-                                      i_9 = 0;
-                                      {
-                                        [loop] for(; (i_9 < 1); i_9 = (i_9 + 1)) {
-                                          i_10 = 0;
-                                          {
-                                            [loop] for(; (i_10 < 1); i_10 = (i_10 + 1)) {
-                                              i_11 = 0;
-                                              {
-                                                [loop] for(; (i_11 < 1); i_11 = (i_11 + 1)) {
-                                                  i_12 = 0;
-                                                  {
-                                                    [loop] for(; (i_12 < 1); i_12 = (i_12 + 1)) {
-                                                      i_13 = 0;
-                                                      {
-                                                        [loop] for(; (i_13 < 1); i_13 = (i_13 + 1)) {
-                                                          i_14 = 0;
-                                                          {
-                                                            [loop] for(; (i_14 < 1); i_14 = (i_14 + 1)) {
-                                                              i_15 = 0;
-                                                              {
-                                                                [loop] for(; (i_15 < 1); i_15 = (i_15 + 1)) {
-                                                                  i_16 = 0;
-                                                                  {
-                                                                    [loop] for(; (i_16 < 1); i_16 = (i_16 + 1)) {
-                                                                      i_17 = 0;
-                                                                      {
-                                                                        [loop] for(; (i_17 < 1); i_17 = (i_17 + 1)) {
-                                                                          i_18 = 0;
-                                                                          {
-                                                                            [loop] for(; (i_18 < 1); i_18 = (i_18 + 1)) {
-                                                                              i_19 = 0;
-                                                                              {
-                                                                                [loop] for(; (i_19 < 1); i_19 = (i_19 + 1)) {
-                                                                                  i_20 = 0;
-                                                                                  {
-                                                                                    [loop] for(; (i_20 < 1); i_20 = (i_20 + 1)) {
-                                                                                      i_21 = 0;
-                                                                                      {
-                                                                                        [loop] for(; (i_21 < 1); i_21 = (i_21 + 1)) {
-                                                                                          i_22 = 0;
-                                                                                          {
-                                                                                            [loop] for(; (i_22 < 1); i_22 = (i_22 + 1)) {
-                                                                                              i_23 = 0;
-                                                                                              {
-                                                                                                [loop] for(; (i_23 < 1); i_23 = (i_23 + 1)) {
-                                                                                                  i_24 = 0;
-                                                                                                  {
-                                                                                                    [loop] for(; (i_24 < 1); i_24 = (i_24 + 1)) {
-                                                                                                      i_25 = 0;
-                                                                                                      {
-                                                                                                        [loop] for(; (i_25 < 1); i_25 = (i_25 + 1)) {
-                                                                                                          i_26 = 0;
-                                                                                                          {
-                                                                                                            [loop] for(; (i_26 < 1); i_26 = (i_26 + 1)) {
-                                                                                                              i_27 = 0;
-                                                                                                              {
-                                                                                                                [loop] for(; (i_27 < 1); i_27 = (i_27 + 1)) {
-                                                                                                                  i_28 = 0;
-                                                                                                                  {
-                                                                                                                    [loop] for(; (i_28 < 1); i_28 = (i_28 + 1)) {
-                                                                                                                      i_29 = 0;
-                                                                                                                      {
-                                                                                                                        [loop] for(; (i_29 < 1); i_29 = (i_29 + 1)) {
-                                                                                                                          i_30 = 0;
-                                                                                                                          {
-                                                                                                                            [loop] for(; (i_30 < 1); i_30 = (i_30 + 1)) {
-                                                                                                                              i_31 = 0;
-                                                                                                                              {
-                                                                                                                                [loop] for(; (i_31 < 1); i_31 = (i_31 + 1)) {
-                                                                                                                                  i_32 = 0;
-                                                                                                                                  {
-                                                                                                                                    [loop] for(; (i_32 < 1); i_32 = (i_32 + 1)) {
-                                                                                                                                      i_33 = 0;
-                                                                                                                                      {
-                                                                                                                                        [loop] for(; (i_33 < 1); i_33 = (i_33 + 1)) {
-                                                                                                                                          i_34 = 0;
-                                                                                                                                          {
-                                                                                                                                            [loop] for(; (i_34 < 1); i_34 = (i_34 + 1)) {
-                                                                                                                                              i_35 = 0;
-                                                                                                                                              {
-                                                                                                                                                [loop] for(; (i_35 < 1); i_35 = (i_35 + 1)) {
-                                                                                                                                                  i_36 = 0;
-                                                                                                                                                  {
-                                                                                                                                                    [loop] for(; (i_36 < 1); i_36 = (i_36 + 1)) {
-                                                                                                                                                      i_37 = 0;
-                                                                                                                                                      {
-                                                                                                                                                        [loop] for(; (i_37 < 1); i_37 = (i_37 + 1)) {
-                                                                                                                                                          [loop] while (true) {
-                                                                                                                                                            x_GLF_global_loop_count = (x_GLF_global_loop_count + 1);
-                                                                                                                                                            {
-                                                                                                                                                              if ((x_GLF_global_loop_count < 98)) {
-                                                                                                                                                              } else {
-                                                                                                                                                                break;
-                                                                                                                                                              }
-                                                                                                                                                            }
-                                                                                                                                                          }
-                                                                                                                                                          set_scalar_float2x3(m23, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float2x4(m24, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float3x2(m32, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float3x3(m33, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float3x4(m34, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float4x2(m42, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float4x3(m43, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float4x4(m44, i_37, i_37, 1.0f);
-                                                                                                                                                        }
-                                                                                                                                                      }
-                                                                                                                                                    }
-                                                                                                                                                  }
-                                                                                                                                                }
-                                                                                                                                              }
-                                                                                                                                            }
-                                                                                                                                          }
-                                                                                                                                        }
-                                                                                                                                      }
-                                                                                                                                    }
-                                                                                                                                  }
-                                                                                                                                }
-                                                                                                                              }
-                                                                                                                            }
-                                                                                                                          }
-                                                                                                                        }
-                                                                                                                      }
-                                                                                                                    }
-                                                                                                                  }
-                                                                                                                }
-                                                                                                              }
-                                                                                                            }
-                                                                                                          }
-                                                                                                        }
-                                                                                                      }
-                                                                                                    }
-                                                                                                  }
-                                                                                                }
-                                                                                              }
-                                                                                            }
-                                                                                          }
-                                                                                        }
-                                                                                      }
-                                                                                    }
+  [loop] while (true) {
+    const int x_105 = i;
+    if ((x_105 < 1)) {
+    } else {
+      break;
+    }
+    i_1 = 0;
+    [loop] while (true) {
+      const int x_112 = i_1;
+      if ((x_112 < 1)) {
+      } else {
+        break;
+      }
+      i_2 = 0;
+      [loop] while (true) {
+        const int x_119 = i_2;
+        if ((x_119 < 1)) {
+        } else {
+          break;
+        }
+        i_3 = 0;
+        [loop] while (true) {
+          const int x_126 = i_3;
+          if ((x_126 < 1)) {
+          } else {
+            break;
+          }
+          i_4 = 0;
+          [loop] while (true) {
+            const int x_133 = i_4;
+            if ((x_133 < 1)) {
+            } else {
+              break;
+            }
+            i_5 = 0;
+            [loop] while (true) {
+              const int x_140 = i_5;
+              if ((x_140 < 1)) {
+              } else {
+                break;
+              }
+              i_6 = 0;
+              [loop] while (true) {
+                const int x_147 = i_6;
+                if ((x_147 < 1)) {
+                } else {
+                  break;
+                }
+                i_7 = 0;
+                [loop] while (true) {
+                  const int x_154 = i_7;
+                  if ((x_154 < 1)) {
+                  } else {
+                    break;
+                  }
+                  i_8 = 0;
+                  [loop] while (true) {
+                    const int x_161 = i_8;
+                    if ((x_161 < 1)) {
+                    } else {
+                      break;
+                    }
+                    i_9 = 0;
+                    [loop] while (true) {
+                      const int x_168 = i_9;
+                      if ((x_168 < 1)) {
+                      } else {
+                        break;
+                      }
+                      i_10 = 0;
+                      [loop] while (true) {
+                        const int x_175 = i_10;
+                        if ((x_175 < 1)) {
+                        } else {
+                          break;
+                        }
+                        i_11 = 0;
+                        [loop] while (true) {
+                          const int x_182 = i_11;
+                          if ((x_182 < 1)) {
+                          } else {
+                            break;
+                          }
+                          i_12 = 0;
+                          [loop] while (true) {
+                            const int x_189 = i_12;
+                            if ((x_189 < 1)) {
+                            } else {
+                              break;
+                            }
+                            i_13 = 0;
+                            [loop] while (true) {
+                              const int x_196 = i_13;
+                              if ((x_196 < 1)) {
+                              } else {
+                                break;
+                              }
+                              i_14 = 0;
+                              [loop] while (true) {
+                                const int x_203 = i_14;
+                                if ((x_203 < 1)) {
+                                } else {
+                                  break;
+                                }
+                                i_15 = 0;
+                                [loop] while (true) {
+                                  const int x_210 = i_15;
+                                  if ((x_210 < 1)) {
+                                  } else {
+                                    break;
+                                  }
+                                  i_16 = 0;
+                                  [loop] while (true) {
+                                    const int x_217 = i_16;
+                                    if ((x_217 < 1)) {
+                                    } else {
+                                      break;
+                                    }
+                                    i_17 = 0;
+                                    [loop] while (true) {
+                                      const int x_224 = i_17;
+                                      if ((x_224 < 1)) {
+                                      } else {
+                                        break;
+                                      }
+                                      i_18 = 0;
+                                      [loop] while (true) {
+                                        const int x_231 = i_18;
+                                        if ((x_231 < 1)) {
+                                        } else {
+                                          break;
+                                        }
+                                        i_19 = 0;
+                                        [loop] while (true) {
+                                          const int x_238 = i_19;
+                                          if ((x_238 < 1)) {
+                                          } else {
+                                            break;
+                                          }
+                                          i_20 = 0;
+                                          [loop] while (true) {
+                                            const int x_245 = i_20;
+                                            if ((x_245 < 1)) {
+                                            } else {
+                                              break;
+                                            }
+                                            i_21 = 0;
+                                            [loop] while (true) {
+                                              const int x_252 = i_21;
+                                              if ((x_252 < 1)) {
+                                              } else {
+                                                break;
+                                              }
+                                              i_22 = 0;
+                                              [loop] while (true) {
+                                                const int x_259 = i_22;
+                                                if ((x_259 < 1)) {
+                                                } else {
+                                                  break;
+                                                }
+                                                i_23 = 0;
+                                                [loop] while (true) {
+                                                  const int x_266 = i_23;
+                                                  if ((x_266 < 1)) {
+                                                  } else {
+                                                    break;
+                                                  }
+                                                  i_24 = 0;
+                                                  [loop] while (true) {
+                                                    const int x_273 = i_24;
+                                                    if ((x_273 < 1)) {
+                                                    } else {
+                                                      break;
+                                                    }
+                                                    i_25 = 0;
+                                                    [loop] while (true) {
+                                                      const int x_280 = i_25;
+                                                      if ((x_280 < 1)) {
+                                                      } else {
+                                                        break;
+                                                      }
+                                                      i_26 = 0;
+                                                      [loop] while (true) {
+                                                        const int x_287 = i_26;
+                                                        if ((x_287 < 1)) {
+                                                        } else {
+                                                          break;
+                                                        }
+                                                        i_27 = 0;
+                                                        [loop] while (true) {
+                                                          const int x_294 = i_27;
+                                                          if ((x_294 < 1)) {
+                                                          } else {
+                                                            break;
+                                                          }
+                                                          i_28 = 0;
+                                                          [loop] while (true) {
+                                                            const int x_301 = i_28;
+                                                            if ((x_301 < 1)) {
+                                                            } else {
+                                                              break;
+                                                            }
+                                                            i_29 = 0;
+                                                            [loop] while (true) {
+                                                              const int x_308 = i_29;
+                                                              if ((x_308 < 1)) {
+                                                              } else {
+                                                                break;
+                                                              }
+                                                              i_30 = 0;
+                                                              [loop] while (true) {
+                                                                const int x_315 = i_30;
+                                                                if ((x_315 < 1)) {
+                                                                } else {
+                                                                  break;
+                                                                }
+                                                                i_31 = 0;
+                                                                [loop] while (true) {
+                                                                  const int x_322 = i_31;
+                                                                  if ((x_322 < 1)) {
+                                                                  } else {
+                                                                    break;
+                                                                  }
+                                                                  i_32 = 0;
+                                                                  [loop] while (true) {
+                                                                    const int x_329 = i_32;
+                                                                    if ((x_329 < 1)) {
+                                                                    } else {
+                                                                      break;
+                                                                    }
+                                                                    i_33 = 0;
+                                                                    [loop] while (true) {
+                                                                      const int x_336 = i_33;
+                                                                      if ((x_336 < 1)) {
+                                                                      } else {
+                                                                        break;
+                                                                      }
+                                                                      i_34 = 0;
+                                                                      [loop] while (true) {
+                                                                        const int x_343 = i_34;
+                                                                        if ((x_343 < 1)) {
+                                                                        } else {
+                                                                          break;
+                                                                        }
+                                                                        i_35 = 0;
+                                                                        [loop] while (true) {
+                                                                          const int x_350 = i_35;
+                                                                          if ((x_350 < 1)) {
+                                                                          } else {
+                                                                            break;
+                                                                          }
+                                                                          i_36 = 0;
+                                                                          [loop] while (true) {
+                                                                            const int x_357 = i_36;
+                                                                            if ((x_357 < 1)) {
+                                                                            } else {
+                                                                              break;
+                                                                            }
+                                                                            i_37 = 0;
+                                                                            [loop] while (true) {
+                                                                              const int x_364 = i_37;
+                                                                              if ((x_364 < 1)) {
+                                                                              } else {
+                                                                                break;
+                                                                              }
+                                                                              [loop] while (true) {
+                                                                                const int x_371 = x_GLF_global_loop_count;
+                                                                                x_GLF_global_loop_count = (x_371 + 1);
+                                                                                {
+                                                                                  const int x_373 = x_GLF_global_loop_count;
+                                                                                  if ((x_373 < 98)) {
+                                                                                  } else {
+                                                                                    break;
                                                                                   }
                                                                                 }
                                                                               }
+                                                                              const int x_375 = i_37;
+                                                                              const int x_376 = i_37;
+                                                                              set_scalar_float2x3(m23, x_376, x_375, 1.0f);
+                                                                              const int x_378 = i_37;
+                                                                              const int x_379 = i_37;
+                                                                              set_scalar_float2x4(m24, x_379, x_378, 1.0f);
+                                                                              const int x_381 = i_37;
+                                                                              const int x_382 = i_37;
+                                                                              set_scalar_float3x2(m32, x_382, x_381, 1.0f);
+                                                                              const int x_384 = i_37;
+                                                                              const int x_385 = i_37;
+                                                                              set_scalar_float3x3(m33, x_385, x_384, 1.0f);
+                                                                              const int x_387 = i_37;
+                                                                              const int x_388 = i_37;
+                                                                              set_scalar_float3x4(m34, x_388, x_387, 1.0f);
+                                                                              const int x_390 = i_37;
+                                                                              const int x_391 = i_37;
+                                                                              set_scalar_float4x2(m42, x_391, x_390, 1.0f);
+                                                                              const int x_393 = i_37;
+                                                                              const int x_394 = i_37;
+                                                                              set_scalar_float4x3(m43, x_394, x_393, 1.0f);
+                                                                              const int x_396 = i_37;
+                                                                              const int x_397 = i_37;
+                                                                              set_scalar_float4x4(m44, x_397, x_396, 1.0f);
+                                                                              {
+                                                                                const int x_399 = i_37;
+                                                                                i_37 = (x_399 + 1);
+                                                                              }
+                                                                            }
+                                                                            {
+                                                                              const int x_401 = i_36;
+                                                                              i_36 = (x_401 + 1);
                                                                             }
                                                                           }
+                                                                          {
+                                                                            const int x_403 = i_35;
+                                                                            i_35 = (x_403 + 1);
+                                                                          }
+                                                                        }
+                                                                        {
+                                                                          const int x_405 = i_34;
+                                                                          i_34 = (x_405 + 1);
                                                                         }
                                                                       }
+                                                                      {
+                                                                        const int x_407 = i_33;
+                                                                        i_33 = (x_407 + 1);
+                                                                      }
+                                                                    }
+                                                                    {
+                                                                      const int x_409 = i_32;
+                                                                      i_32 = (x_409 + 1);
                                                                     }
                                                                   }
+                                                                  {
+                                                                    const int x_411 = i_31;
+                                                                    i_31 = (x_411 + 1);
+                                                                  }
+                                                                }
+                                                                {
+                                                                  const int x_413 = i_30;
+                                                                  i_30 = (x_413 + 1);
                                                                 }
                                                               }
+                                                              {
+                                                                const int x_415 = i_29;
+                                                                i_29 = (x_415 + 1);
+                                                              }
+                                                            }
+                                                            {
+                                                              const int x_417 = i_28;
+                                                              i_28 = (x_417 + 1);
                                                             }
                                                           }
+                                                          {
+                                                            const int x_419 = i_27;
+                                                            i_27 = (x_419 + 1);
+                                                          }
+                                                        }
+                                                        {
+                                                          const int x_421 = i_26;
+                                                          i_26 = (x_421 + 1);
                                                         }
                                                       }
+                                                      {
+                                                        const int x_423 = i_25;
+                                                        i_25 = (x_423 + 1);
+                                                      }
+                                                    }
+                                                    {
+                                                      const int x_425 = i_24;
+                                                      i_24 = (x_425 + 1);
                                                     }
                                                   }
+                                                  {
+                                                    const int x_427 = i_23;
+                                                    i_23 = (x_427 + 1);
+                                                  }
+                                                }
+                                                {
+                                                  const int x_429 = i_22;
+                                                  i_22 = (x_429 + 1);
                                                 }
                                               }
+                                              {
+                                                const int x_431 = i_21;
+                                                i_21 = (x_431 + 1);
+                                              }
+                                            }
+                                            {
+                                              const int x_433 = i_20;
+                                              i_20 = (x_433 + 1);
                                             }
                                           }
+                                          {
+                                            const int x_435 = i_19;
+                                            i_19 = (x_435 + 1);
+                                          }
+                                        }
+                                        {
+                                          const int x_437 = i_18;
+                                          i_18 = (x_437 + 1);
                                         }
                                       }
+                                      {
+                                        const int x_439 = i_17;
+                                        i_17 = (x_439 + 1);
+                                      }
+                                    }
+                                    {
+                                      const int x_441 = i_16;
+                                      i_16 = (x_441 + 1);
                                     }
                                   }
+                                  {
+                                    const int x_443 = i_15;
+                                    i_15 = (x_443 + 1);
+                                  }
+                                }
+                                {
+                                  const int x_445 = i_14;
+                                  i_14 = (x_445 + 1);
                                 }
                               }
+                              {
+                                const int x_447 = i_13;
+                                i_13 = (x_447 + 1);
+                              }
+                            }
+                            {
+                              const int x_449 = i_12;
+                              i_12 = (x_449 + 1);
                             }
                           }
+                          {
+                            const int x_451 = i_11;
+                            i_11 = (x_451 + 1);
+                          }
+                        }
+                        {
+                          const int x_453 = i_10;
+                          i_10 = (x_453 + 1);
                         }
                       }
+                      {
+                        const int x_455 = i_9;
+                        i_9 = (x_455 + 1);
+                      }
+                    }
+                    {
+                      const int x_457 = i_8;
+                      i_8 = (x_457 + 1);
                     }
                   }
+                  {
+                    const int x_459 = i_7;
+                    i_7 = (x_459 + 1);
+                  }
+                }
+                {
+                  const int x_461 = i_6;
+                  i_6 = (x_461 + 1);
                 }
               }
+              {
+                const int x_463 = i_5;
+                i_5 = (x_463 + 1);
+              }
+            }
+            {
+              const int x_465 = i_4;
+              i_4 = (x_465 + 1);
             }
           }
+          {
+            const int x_467 = i_3;
+            i_3 = (x_467 + 1);
+          }
+        }
+        {
+          const int x_469 = i_2;
+          i_2 = (x_469 + 1);
         }
       }
+      {
+        const int x_471 = i_1;
+        i_1 = (x_471 + 1);
+      }
+    }
+    {
+      const int x_473 = i;
+      i = (x_473 + 1);
     }
   }
   sum = 0.0f;
   r = 0;
-  {
-    [loop] for(; (x_GLF_global_loop_count < 100); r = (r + 1)) {
-      x_GLF_global_loop_count = (x_GLF_global_loop_count + 1);
-      const float x_486 = m23[0][r];
-      sum = (sum + x_486);
-      const float x_491 = m24[0][r];
-      sum = (sum + x_491);
-      const float x_496 = m32[0][r];
-      sum = (sum + x_496);
-      const float x_501 = m33[0][r];
-      sum = (sum + x_501);
-      const float x_506 = m34[0][r];
-      sum = (sum + x_506);
-      const float x_511 = m42[0][r];
-      sum = (sum + x_511);
-      const float x_516 = m43[0][r];
-      sum = (sum + x_516);
-      const float x_521 = m44[0][r];
-      sum = (sum + x_521);
+  [loop] while (true) {
+    const int x_479 = x_GLF_global_loop_count;
+    if ((x_479 < 100)) {
+    } else {
+      break;
+    }
+    const int x_482 = x_GLF_global_loop_count;
+    x_GLF_global_loop_count = (x_482 + 1);
+    const int x_484 = r;
+    const float x_486 = m23[0][x_484];
+    const float x_487 = sum;
+    sum = (x_487 + x_486);
+    const int x_489 = r;
+    const float x_491 = m24[0][x_489];
+    const float x_492 = sum;
+    sum = (x_492 + x_491);
+    const int x_494 = r;
+    const float x_496 = m32[0][x_494];
+    const float x_497 = sum;
+    sum = (x_497 + x_496);
+    const int x_499 = r;
+    const float x_501 = m33[0][x_499];
+    const float x_502 = sum;
+    sum = (x_502 + x_501);
+    const int x_504 = r;
+    const float x_506 = m34[0][x_504];
+    const float x_507 = sum;
+    sum = (x_507 + x_506);
+    const int x_509 = r;
+    const float x_511 = m42[0][x_509];
+    const float x_512 = sum;
+    sum = (x_512 + x_511);
+    const int x_514 = r;
+    const float x_516 = m43[0][x_514];
+    const float x_517 = sum;
+    sum = (x_517 + x_516);
+    const int x_519 = r;
+    const float x_521 = m44[0][x_519];
+    const float x_522 = sum;
+    sum = (x_522 + x_521);
+    {
+      const int x_524 = r;
+      r = (x_524 + 1);
     }
   }
-  if ((sum == 8.0f)) {
+  const float x_526 = sum;
+  if ((x_526 == 8.0f)) {
     x_GLF_color = float4(1.0f, 0.0f, 0.0f, 1.0f);
   } else {
     x_GLF_color = (0.0f).xxxx;
@@ -433,3 +742,6 @@
   wrapper_result.x_GLF_color_1 = inner_result.x_GLF_color_1;
   return wrapper_result;
 }
+FXC validation failure:
+C:\src\dawn\test\tint\Shader@0x000001C31974FD40(409,76-87): error X3531: can't unroll loops marked with loop attribute
+
diff --git a/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.wgsl.expected.fxc.hlsl b/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.wgsl.expected.fxc.hlsl
index 98a6605..4ae3c7d 100644
--- a/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.wgsl.expected.fxc.hlsl
+++ b/test/tint/vk-gl-cts/graphicsfuzz/cov-multiple-one-iteration-loops-global-counter-write-matrices/0-opt.wgsl.expected.fxc.hlsl
@@ -1,4 +1,4 @@
-SKIP: FAILED - TIMEOUT
+SKIP: FAILED - crbug.com/tint/1375
 
 void set_scalar_float2x3(inout float2x3 mat, int col, int row, float val) {
   switch (col) {
@@ -177,236 +177,545 @@
   m43 = float4x3((0.0f).xxx, (0.0f).xxx, (0.0f).xxx, (0.0f).xxx);
   m44 = float4x4((0.0f).xxxx, (0.0f).xxxx, (0.0f).xxxx, (0.0f).xxxx);
   i = 0;
-  {
-    [loop] for(; (i < 1); i = (i + 1)) {
-      i_1 = 0;
-      {
-        [loop] for(; (i_1 < 1); i_1 = (i_1 + 1)) {
-          i_2 = 0;
-          {
-            [loop] for(; (i_2 < 1); i_2 = (i_2 + 1)) {
-              i_3 = 0;
-              {
-                [loop] for(; (i_3 < 1); i_3 = (i_3 + 1)) {
-                  i_4 = 0;
-                  {
-                    [loop] for(; (i_4 < 1); i_4 = (i_4 + 1)) {
-                      i_5 = 0;
-                      {
-                        [loop] for(; (i_5 < 1); i_5 = (i_5 + 1)) {
-                          i_6 = 0;
-                          {
-                            [loop] for(; (i_6 < 1); i_6 = (i_6 + 1)) {
-                              i_7 = 0;
-                              {
-                                [loop] for(; (i_7 < 1); i_7 = (i_7 + 1)) {
-                                  i_8 = 0;
-                                  {
-                                    [loop] for(; (i_8 < 1); i_8 = (i_8 + 1)) {
-                                      i_9 = 0;
-                                      {
-                                        [loop] for(; (i_9 < 1); i_9 = (i_9 + 1)) {
-                                          i_10 = 0;
-                                          {
-                                            [loop] for(; (i_10 < 1); i_10 = (i_10 + 1)) {
-                                              i_11 = 0;
-                                              {
-                                                [loop] for(; (i_11 < 1); i_11 = (i_11 + 1)) {
-                                                  i_12 = 0;
-                                                  {
-                                                    [loop] for(; (i_12 < 1); i_12 = (i_12 + 1)) {
-                                                      i_13 = 0;
-                                                      {
-                                                        [loop] for(; (i_13 < 1); i_13 = (i_13 + 1)) {
-                                                          i_14 = 0;
-                                                          {
-                                                            [loop] for(; (i_14 < 1); i_14 = (i_14 + 1)) {
-                                                              i_15 = 0;
-                                                              {
-                                                                [loop] for(; (i_15 < 1); i_15 = (i_15 + 1)) {
-                                                                  i_16 = 0;
-                                                                  {
-                                                                    [loop] for(; (i_16 < 1); i_16 = (i_16 + 1)) {
-                                                                      i_17 = 0;
-                                                                      {
-                                                                        [loop] for(; (i_17 < 1); i_17 = (i_17 + 1)) {
-                                                                          i_18 = 0;
-                                                                          {
-                                                                            [loop] for(; (i_18 < 1); i_18 = (i_18 + 1)) {
-                                                                              i_19 = 0;
-                                                                              {
-                                                                                [loop] for(; (i_19 < 1); i_19 = (i_19 + 1)) {
-                                                                                  i_20 = 0;
-                                                                                  {
-                                                                                    [loop] for(; (i_20 < 1); i_20 = (i_20 + 1)) {
-                                                                                      i_21 = 0;
-                                                                                      {
-                                                                                        [loop] for(; (i_21 < 1); i_21 = (i_21 + 1)) {
-                                                                                          i_22 = 0;
-                                                                                          {
-                                                                                            [loop] for(; (i_22 < 1); i_22 = (i_22 + 1)) {
-                                                                                              i_23 = 0;
-                                                                                              {
-                                                                                                [loop] for(; (i_23 < 1); i_23 = (i_23 + 1)) {
-                                                                                                  i_24 = 0;
-                                                                                                  {
-                                                                                                    [loop] for(; (i_24 < 1); i_24 = (i_24 + 1)) {
-                                                                                                      i_25 = 0;
-                                                                                                      {
-                                                                                                        [loop] for(; (i_25 < 1); i_25 = (i_25 + 1)) {
-                                                                                                          i_26 = 0;
-                                                                                                          {
-                                                                                                            [loop] for(; (i_26 < 1); i_26 = (i_26 + 1)) {
-                                                                                                              i_27 = 0;
-                                                                                                              {
-                                                                                                                [loop] for(; (i_27 < 1); i_27 = (i_27 + 1)) {
-                                                                                                                  i_28 = 0;
-                                                                                                                  {
-                                                                                                                    [loop] for(; (i_28 < 1); i_28 = (i_28 + 1)) {
-                                                                                                                      i_29 = 0;
-                                                                                                                      {
-                                                                                                                        [loop] for(; (i_29 < 1); i_29 = (i_29 + 1)) {
-                                                                                                                          i_30 = 0;
-                                                                                                                          {
-                                                                                                                            [loop] for(; (i_30 < 1); i_30 = (i_30 + 1)) {
-                                                                                                                              i_31 = 0;
-                                                                                                                              {
-                                                                                                                                [loop] for(; (i_31 < 1); i_31 = (i_31 + 1)) {
-                                                                                                                                  i_32 = 0;
-                                                                                                                                  {
-                                                                                                                                    [loop] for(; (i_32 < 1); i_32 = (i_32 + 1)) {
-                                                                                                                                      i_33 = 0;
-                                                                                                                                      {
-                                                                                                                                        [loop] for(; (i_33 < 1); i_33 = (i_33 + 1)) {
-                                                                                                                                          i_34 = 0;
-                                                                                                                                          {
-                                                                                                                                            [loop] for(; (i_34 < 1); i_34 = (i_34 + 1)) {
-                                                                                                                                              i_35 = 0;
-                                                                                                                                              {
-                                                                                                                                                [loop] for(; (i_35 < 1); i_35 = (i_35 + 1)) {
-                                                                                                                                                  i_36 = 0;
-                                                                                                                                                  {
-                                                                                                                                                    [loop] for(; (i_36 < 1); i_36 = (i_36 + 1)) {
-                                                                                                                                                      i_37 = 0;
-                                                                                                                                                      {
-                                                                                                                                                        [loop] for(; (i_37 < 1); i_37 = (i_37 + 1)) {
-                                                                                                                                                          [loop] while (true) {
-                                                                                                                                                            x_GLF_global_loop_count = (x_GLF_global_loop_count + 1);
-                                                                                                                                                            {
-                                                                                                                                                              if ((x_GLF_global_loop_count < 98)) {
-                                                                                                                                                              } else {
-                                                                                                                                                                break;
-                                                                                                                                                              }
-                                                                                                                                                            }
-                                                                                                                                                          }
-                                                                                                                                                          set_scalar_float2x3(m23, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float2x4(m24, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float3x2(m32, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float3x3(m33, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float3x4(m34, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float4x2(m42, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float4x3(m43, i_37, i_37, 1.0f);
-                                                                                                                                                          set_scalar_float4x4(m44, i_37, i_37, 1.0f);
-                                                                                                                                                        }
-                                                                                                                                                      }
-                                                                                                                                                    }
-                                                                                                                                                  }
-                                                                                                                                                }
-                                                                                                                                              }
-                                                                                                                                            }
-                                                                                                                                          }
-                                                                                                                                        }
-                                                                                                                                      }
-                                                                                                                                    }
-                                                                                                                                  }
-                                                                                                                                }
-                                                                                                                              }
-                                                                                                                            }
-                                                                                                                          }
-                                                                                                                        }
-                                                                                                                      }
-                                                                                                                    }
-                                                                                                                  }
-                                                                                                                }
-                                                                                                              }
-                                                                                                            }
-                                                                                                          }
-                                                                                                        }
-                                                                                                      }
-                                                                                                    }
-                                                                                                  }
-                                                                                                }
-                                                                                              }
-                                                                                            }
-                                                                                          }
-                                                                                        }
-                                                                                      }
-                                                                                    }
+  [loop] while (true) {
+    const int x_105 = i;
+    if ((x_105 < 1)) {
+    } else {
+      break;
+    }
+    i_1 = 0;
+    [loop] while (true) {
+      const int x_112 = i_1;
+      if ((x_112 < 1)) {
+      } else {
+        break;
+      }
+      i_2 = 0;
+      [loop] while (true) {
+        const int x_119 = i_2;
+        if ((x_119 < 1)) {
+        } else {
+          break;
+        }
+        i_3 = 0;
+        [loop] while (true) {
+          const int x_126 = i_3;
+          if ((x_126 < 1)) {
+          } else {
+            break;
+          }
+          i_4 = 0;
+          [loop] while (true) {
+            const int x_133 = i_4;
+            if ((x_133 < 1)) {
+            } else {
+              break;
+            }
+            i_5 = 0;
+            [loop] while (true) {
+              const int x_140 = i_5;
+              if ((x_140 < 1)) {
+              } else {
+                break;
+              }
+              i_6 = 0;
+              [loop] while (true) {
+                const int x_147 = i_6;
+                if ((x_147 < 1)) {
+                } else {
+                  break;
+                }
+                i_7 = 0;
+                [loop] while (true) {
+                  const int x_154 = i_7;
+                  if ((x_154 < 1)) {
+                  } else {
+                    break;
+                  }
+                  i_8 = 0;
+                  [loop] while (true) {
+                    const int x_161 = i_8;
+                    if ((x_161 < 1)) {
+                    } else {
+                      break;
+                    }
+                    i_9 = 0;
+                    [loop] while (true) {
+                      const int x_168 = i_9;
+                      if ((x_168 < 1)) {
+                      } else {
+                        break;
+                      }
+                      i_10 = 0;
+                      [loop] while (true) {
+                        const int x_175 = i_10;
+                        if ((x_175 < 1)) {
+                        } else {
+                          break;
+                        }
+                        i_11 = 0;
+                        [loop] while (true) {
+                          const int x_182 = i_11;
+                          if ((x_182 < 1)) {
+                          } else {
+                            break;
+                          }
+                          i_12 = 0;
+                          [loop] while (true) {
+                            const int x_189 = i_12;
+                            if ((x_189 < 1)) {
+                            } else {
+                              break;
+                            }
+                            i_13 = 0;
+                            [loop] while (true) {
+                              const int x_196 = i_13;
+                              if ((x_196 < 1)) {
+                              } else {
+                                break;
+                              }
+                              i_14 = 0;
+                              [loop] while (true) {
+                                const int x_203 = i_14;
+                                if ((x_203 < 1)) {
+                                } else {
+                                  break;
+                                }
+                                i_15 = 0;
+                                [loop] while (true) {
+                                  const int x_210 = i_15;
+                                  if ((x_210 < 1)) {
+                                  } else {
+                                    break;
+                                  }
+                                  i_16 = 0;
+                                  [loop] while (true) {
+                                    const int x_217 = i_16;
+                                    if ((x_217 < 1)) {
+                                    } else {
+                                      break;
+                                    }
+                                    i_17 = 0;
+                                    [loop] while (true) {
+                                      const int x_224 = i_17;
+                                      if ((x_224 < 1)) {
+                                      } else {
+                                        break;
+                                      }
+                                      i_18 = 0;
+                                      [loop] while (true) {
+                                        const int x_231 = i_18;
+                                        if ((x_231 < 1)) {
+                                        } else {
+                                          break;
+                                        }
+                                        i_19 = 0;
+                                        [loop] while (true) {
+                                          const int x_238 = i_19;
+                                          if ((x_238 < 1)) {
+                                          } else {
+                                            break;
+                                          }
+                                          i_20 = 0;
+                                          [loop] while (true) {
+                                            const int x_245 = i_20;
+                                            if ((x_245 < 1)) {
+                                            } else {
+                                              break;
+                                            }
+                                            i_21 = 0;
+                                            [loop] while (true) {
+                                              const int x_252 = i_21;
+                                              if ((x_252 < 1)) {
+                                              } else {
+                                                break;
+                                              }
+                                              i_22 = 0;
+                                              [loop] while (true) {
+                                                const int x_259 = i_22;
+                                                if ((x_259 < 1)) {
+                                                } else {
+                                                  break;
+                                                }
+                                                i_23 = 0;
+                                                [loop] while (true) {
+                                                  const int x_266 = i_23;
+                                                  if ((x_266 < 1)) {
+                                                  } else {
+                                                    break;
+                                                  }
+                                                  i_24 = 0;
+                                                  [loop] while (true) {
+                                                    const int x_273 = i_24;
+                                                    if ((x_273 < 1)) {
+                                                    } else {
+                                                      break;
+                                                    }
+                                                    i_25 = 0;
+                                                    [loop] while (true) {
+                                                      const int x_280 = i_25;
+                                                      if ((x_280 < 1)) {
+                                                      } else {
+                                                        break;
+                                                      }
+                                                      i_26 = 0;
+                                                      [loop] while (true) {
+                                                        const int x_287 = i_26;
+                                                        if ((x_287 < 1)) {
+                                                        } else {
+                                                          break;
+                                                        }
+                                                        i_27 = 0;
+                                                        [loop] while (true) {
+                                                          const int x_294 = i_27;
+                                                          if ((x_294 < 1)) {
+                                                          } else {
+                                                            break;
+                                                          }
+                                                          i_28 = 0;
+                                                          [loop] while (true) {
+                                                            const int x_301 = i_28;
+                                                            if ((x_301 < 1)) {
+                                                            } else {
+                                                              break;
+                                                            }
+                                                            i_29 = 0;
+                                                            [loop] while (true) {
+                                                              const int x_308 = i_29;
+                                                              if ((x_308 < 1)) {
+                                                              } else {
+                                                                break;
+                                                              }
+                                                              i_30 = 0;
+                                                              [loop] while (true) {
+                                                                const int x_315 = i_30;
+                                                                if ((x_315 < 1)) {
+                                                                } else {
+                                                                  break;
+                                                                }
+                                                                i_31 = 0;
+                                                                [loop] while (true) {
+                                                                  const int x_322 = i_31;
+                                                                  if ((x_322 < 1)) {
+                                                                  } else {
+                                                                    break;
+                                                                  }
+                                                                  i_32 = 0;
+                                                                  [loop] while (true) {
+                                                                    const int x_329 = i_32;
+                                                                    if ((x_329 < 1)) {
+                                                                    } else {
+                                                                      break;
+                                                                    }
+                                                                    i_33 = 0;
+                                                                    [loop] while (true) {
+                                                                      const int x_336 = i_33;
+                                                                      if ((x_336 < 1)) {
+                                                                      } else {
+                                                                        break;
+                                                                      }
+                                                                      i_34 = 0;
+                                                                      [loop] while (true) {
+                                                                        const int x_343 = i_34;
+                                                                        if ((x_343 < 1)) {
+                                                                        } else {
+                                                                          break;
+                                                                        }
+                                                                        i_35 = 0;
+                                                                        [loop] while (true) {
+                                                                          const int x_350 = i_35;
+                                                                          if ((x_350 < 1)) {
+                                                                          } else {
+                                                                            break;
+                                                                          }
+                                                                          i_36 = 0;
+                                                                          [loop] while (true) {
+                                                                            const int x_357 = i_36;
+                                                                            if ((x_357 < 1)) {
+                                                                            } else {
+                                                                              break;
+                                                                            }
+                                                                            i_37 = 0;
+                                                                            [loop] while (true) {
+                                                                              const int x_364 = i_37;
+                                                                              if ((x_364 < 1)) {
+                                                                              } else {
+                                                                                break;
+                                                                              }
+                                                                              [loop] while (true) {
+                                                                                const int x_371 = x_GLF_global_loop_count;
+                                                                                x_GLF_global_loop_count = (x_371 + 1);
+                                                                                {
+                                                                                  const int x_373 = x_GLF_global_loop_count;
+                                                                                  if ((x_373 < 98)) {
+                                                                                  } else {
+                                                                                    break;
                                                                                   }
                                                                                 }
                                                                               }
+                                                                              const int x_375 = i_37;
+                                                                              const int x_376 = i_37;
+                                                                              set_scalar_float2x3(m23, x_376, x_375, 1.0f);
+                                                                              const int x_378 = i_37;
+                                                                              const int x_379 = i_37;
+                                                                              set_scalar_float2x4(m24, x_379, x_378, 1.0f);
+                                                                              const int x_381 = i_37;
+                                                                              const int x_382 = i_37;
+                                                                              set_scalar_float3x2(m32, x_382, x_381, 1.0f);
+                                                                              const int x_384 = i_37;
+                                                                              const int x_385 = i_37;
+                                                                              set_scalar_float3x3(m33, x_385, x_384, 1.0f);
+                                                                              const int x_387 = i_37;
+                                                                              const int x_388 = i_37;
+                                                                              set_scalar_float3x4(m34, x_388, x_387, 1.0f);
+                                                                              const int x_390 = i_37;
+                                                                              const int x_391 = i_37;
+                                                                              set_scalar_float4x2(m42, x_391, x_390, 1.0f);
+                                                                              const int x_393 = i_37;
+                                                                              const int x_394 = i_37;
+                                                                              set_scalar_float4x3(m43, x_394, x_393, 1.0f);
+                                                                              const int x_396 = i_37;
+                                                                              const int x_397 = i_37;
+                                                                              set_scalar_float4x4(m44, x_397, x_396, 1.0f);
+                                                                              {
+                                                                                const int x_399 = i_37;
+                                                                                i_37 = (x_399 + 1);
+                                                                              }
+                                                                            }
+                                                                            {
+                                                                              const int x_401 = i_36;
+                                                                              i_36 = (x_401 + 1);
                                                                             }
                                                                           }
+                                                                          {
+                                                                            const int x_403 = i_35;
+                                                                            i_35 = (x_403 + 1);
+                                                                          }
+                                                                        }
+                                                                        {
+                                                                          const int x_405 = i_34;
+                                                                          i_34 = (x_405 + 1);
                                                                         }
                                                                       }
+                                                                      {
+                                                                        const int x_407 = i_33;
+                                                                        i_33 = (x_407 + 1);
+                                                                      }
+                                                                    }
+                                                                    {
+                                                                      const int x_409 = i_32;
+                                                                      i_32 = (x_409 + 1);
                                                                     }
                                                                   }
+                                                                  {
+                                                                    const int x_411 = i_31;
+                                                                    i_31 = (x_411 + 1);
+                                                                  }
+                                                                }
+                                                                {
+                                                                  const int x_413 = i_30;
+                                                                  i_30 = (x_413 + 1);
                                                                 }
                                                               }
+                                                              {
+                                                                const int x_415 = i_29;
+                                                                i_29 = (x_415 + 1);
+                                                              }
+                                                            }
+                                                            {
+                                                              const int x_417 = i_28;
+                                                              i_28 = (x_417 + 1);
                                                             }
                                                           }
+                                                          {
+                                                            const int x_419 = i_27;
+                                                            i_27 = (x_419 + 1);
+                                                          }
+                                                        }
+                                                        {
+                                                          const int x_421 = i_26;
+                                                          i_26 = (x_421 + 1);
                                                         }
                                                       }
+                                                      {
+                                                        const int x_423 = i_25;
+                                                        i_25 = (x_423 + 1);
+                                                      }
+                                                    }
+                                                    {
+                                                      const int x_425 = i_24;
+                                                      i_24 = (x_425 + 1);
                                                     }
                                                   }
+                                                  {
+                                                    const int x_427 = i_23;
+                                                    i_23 = (x_427 + 1);
+                                                  }
+                                                }
+                                                {
+                                                  const int x_429 = i_22;
+                                                  i_22 = (x_429 + 1);
                                                 }
                                               }
+                                              {
+                                                const int x_431 = i_21;
+                                                i_21 = (x_431 + 1);
+                                              }
+                                            }
+                                            {
+                                              const int x_433 = i_20;
+                                              i_20 = (x_433 + 1);
                                             }
                                           }
+                                          {
+                                            const int x_435 = i_19;
+                                            i_19 = (x_435 + 1);
+                                          }
+                                        }
+                                        {
+                                          const int x_437 = i_18;
+                                          i_18 = (x_437 + 1);
                                         }
                                       }
+                                      {
+                                        const int x_439 = i_17;
+                                        i_17 = (x_439 + 1);
+                                      }
+                                    }
+                                    {
+                                      const int x_441 = i_16;
+                                      i_16 = (x_441 + 1);
                                     }
                                   }
+                                  {
+                                    const int x_443 = i_15;
+                                    i_15 = (x_443 + 1);
+                                  }
+                                }
+                                {
+                                  const int x_445 = i_14;
+                                  i_14 = (x_445 + 1);
                                 }
                               }
+                              {
+                                const int x_447 = i_13;
+                                i_13 = (x_447 + 1);
+                              }
+                            }
+                            {
+                              const int x_449 = i_12;
+                              i_12 = (x_449 + 1);
                             }
                           }
+                          {
+                            const int x_451 = i_11;
+                            i_11 = (x_451 + 1);
+                          }
+                        }
+                        {
+                          const int x_453 = i_10;
+                          i_10 = (x_453 + 1);
                         }
                       }
+                      {
+                        const int x_455 = i_9;
+                        i_9 = (x_455 + 1);
+                      }
+                    }
+                    {
+                      const int x_457 = i_8;
+                      i_8 = (x_457 + 1);
                     }
                   }
+                  {
+                    const int x_459 = i_7;
+                    i_7 = (x_459 + 1);
+                  }
+                }
+                {
+                  const int x_461 = i_6;
+                  i_6 = (x_461 + 1);
                 }
               }
+              {
+                const int x_463 = i_5;
+                i_5 = (x_463 + 1);
+              }
+            }
+            {
+              const int x_465 = i_4;
+              i_4 = (x_465 + 1);
             }
           }
+          {
+            const int x_467 = i_3;
+            i_3 = (x_467 + 1);
+          }
+        }
+        {
+          const int x_469 = i_2;
+          i_2 = (x_469 + 1);
         }
       }
+      {
+        const int x_471 = i_1;
+        i_1 = (x_471 + 1);
+      }
+    }
+    {
+      const int x_473 = i;
+      i = (x_473 + 1);
     }
   }
   sum = 0.0f;
   r = 0;
-  {
-    [loop] for(; (x_GLF_global_loop_count < 100); r = (r + 1)) {
-      x_GLF_global_loop_count = (x_GLF_global_loop_count + 1);
-      const float x_486 = m23[0][r];
-      sum = (sum + x_486);
-      const float x_491 = m24[0][r];
-      sum = (sum + x_491);
-      const float x_496 = m32[0][r];
-      sum = (sum + x_496);
-      const float x_501 = m33[0][r];
-      sum = (sum + x_501);
-      const float x_506 = m34[0][r];
-      sum = (sum + x_506);
-      const float x_511 = m42[0][r];
-      sum = (sum + x_511);
-      const float x_516 = m43[0][r];
-      sum = (sum + x_516);
-      const float x_521 = m44[0][r];
-      sum = (sum + x_521);
+  [loop] while (true) {
+    const int x_479 = x_GLF_global_loop_count;
+    if ((x_479 < 100)) {
+    } else {
+      break;
+    }
+    const int x_482 = x_GLF_global_loop_count;
+    x_GLF_global_loop_count = (x_482 + 1);
+    const int x_484 = r;
+    const float x_486 = m23[0][x_484];
+    const float x_487 = sum;
+    sum = (x_487 + x_486);
+    const int x_489 = r;
+    const float x_491 = m24[0][x_489];
+    const float x_492 = sum;
+    sum = (x_492 + x_491);
+    const int x_494 = r;
+    const float x_496 = m32[0][x_494];
+    const float x_497 = sum;
+    sum = (x_497 + x_496);
+    const int x_499 = r;
+    const float x_501 = m33[0][x_499];
+    const float x_502 = sum;
+    sum = (x_502 + x_501);
+    const int x_504 = r;
+    const float x_506 = m34[0][x_504];
+    const float x_507 = sum;
+    sum = (x_507 + x_506);
+    const int x_509 = r;
+    const float x_511 = m42[0][x_509];
+    const float x_512 = sum;
+    sum = (x_512 + x_511);
+    const int x_514 = r;
+    const float x_516 = m43[0][x_514];
+    const float x_517 = sum;
+    sum = (x_517 + x_516);
+    const int x_519 = r;
+    const float x_521 = m44[0][x_519];
+    const float x_522 = sum;
+    sum = (x_522 + x_521);
+    {
+      const int x_524 = r;
+      r = (x_524 + 1);
     }
   }
-  if ((sum == 8.0f)) {
+  const float x_526 = sum;
+  if ((x_526 == 8.0f)) {
     x_GLF_color = float4(1.0f, 0.0f, 0.0f, 1.0f);
   } else {
     x_GLF_color = (0.0f).xxxx;
@@ -433,3 +742,6 @@
   wrapper_result.x_GLF_color_1 = inner_result.x_GLF_color_1;
   return wrapper_result;
 }
+FXC validation failure:
+C:\src\dawn\test\tint\Shader@0x000001B05F850BC0(409,76-87): error X3531: can't unroll loops marked with loop attribute
+
diff --git a/test/tint/vk-gl-cts/graphicsfuzz/write-before-break/0-opt.spvasm.expected.fxc.hlsl b/test/tint/vk-gl-cts/graphicsfuzz/write-before-break/0-opt.spvasm.expected.fxc.hlsl
deleted file mode 100755
index 6be60ce..0000000
--- a/test/tint/vk-gl-cts/graphicsfuzz/write-before-break/0-opt.spvasm.expected.fxc.hlsl
+++ /dev/null
@@ -1,100 +0,0 @@
-SKIP: FAILED - TIMEOUT
-
-void set_scalar_float4x3(inout float4x3 mat, int col, int row, float val) {
-  switch (col) {
-    case 0:
-      mat[0] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[0];
-      break;
-    case 1:
-      mat[1] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[1];
-      break;
-    case 2:
-      mat[2] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[2];
-      break;
-    case 3:
-      mat[3] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[3];
-      break;
-  }
-}
-
-cbuffer cbuffer_x_9 : register(b0, space0) {
-  uint4 x_9[1];
-};
-static float4 x_GLF_color = float4(0.0f, 0.0f, 0.0f, 0.0f);
-
-void main_1() {
-  int idx = 0;
-  float4x3 m43 = float4x3(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
-  int ll_1 = 0;
-  int GLF_live6rows = 0;
-  int z = 0;
-  int ll_2 = 0;
-  int ctr = 0;
-  float4x3 tempm43 = float4x3(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
-  int ll_3 = 0;
-  int c = 0;
-  int d = 0;
-  float GLF_live6sums[9] = (float[9])0;
-  idx = 0;
-  m43 = float4x3(float3(1.0f, 0.0f, 0.0f), float3(0.0f, 1.0f, 0.0f), float3(0.0f, 0.0f, 1.0f), (0.0f).xxx);
-  ll_1 = 0;
-  GLF_live6rows = 2;
-  [loop] while (true) {
-    const int x_18 = ll_1;
-    const int x_19 = asint(x_9[0].x);
-    if ((x_18 >= x_19)) {
-      x_GLF_color = float4(1.0f, 0.0f, 0.0f, 1.0f);
-      break;
-    }
-    ll_1 = (ll_1 + 1);
-    const int x_22 = asint(x_9[0].x);
-    z = x_22;
-    ll_2 = 0;
-    ctr = 0;
-    {
-      [loop] for(; (ctr < 1); ctr = (ctr + 1)) {
-        const int x_24 = ll_2;
-        const int x_25 = asint(x_9[0].x);
-        if ((x_24 >= x_25)) {
-          break;
-        }
-        ll_2 = (ll_2 + 1);
-        tempm43 = m43;
-        ll_3 = 0;
-        c = 0;
-        {
-          [loop] for(; (1 < z); c = (c + 1)) {
-            d = 0;
-            set_scalar_float4x3(tempm43, (((d >= 0) & (d < 3)) ? d : 0), (((c >= 0) & (c < 4)) ? c : 0), 1.0f);
-          }
-        }
-        const int x_117 = (((idx >= 0) & (idx < 9)) ? idx : 0);
-        const float x_119 = m43[ctr].y;
-        const float x_121 = GLF_live6sums[x_117];
-        GLF_live6sums[x_117] = (x_121 + x_119);
-      }
-    }
-    idx = (idx + 1);
-  }
-  return;
-}
-
-struct main_out {
-  float4 x_GLF_color_1;
-};
-struct tint_symbol {
-  float4 x_GLF_color_1 : SV_Target0;
-};
-
-main_out main_inner() {
-  main_1();
-  const main_out tint_symbol_2 = {x_GLF_color};
-  return tint_symbol_2;
-}
-
-tint_symbol main() {
-  const main_out inner_result = main_inner();
-  tint_symbol wrapper_result = (tint_symbol)0;
-  wrapper_result.x_GLF_color_1 = inner_result.x_GLF_color_1;
-  return wrapper_result;
-}
diff --git a/test/tint/vk-gl-cts/graphicsfuzz/write-before-break/0-opt.wgsl.expected.fxc.hlsl b/test/tint/vk-gl-cts/graphicsfuzz/write-before-break/0-opt.wgsl.expected.fxc.hlsl
deleted file mode 100755
index 6be60ce..0000000
--- a/test/tint/vk-gl-cts/graphicsfuzz/write-before-break/0-opt.wgsl.expected.fxc.hlsl
+++ /dev/null
@@ -1,100 +0,0 @@
-SKIP: FAILED - TIMEOUT
-
-void set_scalar_float4x3(inout float4x3 mat, int col, int row, float val) {
-  switch (col) {
-    case 0:
-      mat[0] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[0];
-      break;
-    case 1:
-      mat[1] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[1];
-      break;
-    case 2:
-      mat[2] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[2];
-      break;
-    case 3:
-      mat[3] = (row.xxx == int3(0, 1, 2)) ? val.xxx : mat[3];
-      break;
-  }
-}
-
-cbuffer cbuffer_x_9 : register(b0, space0) {
-  uint4 x_9[1];
-};
-static float4 x_GLF_color = float4(0.0f, 0.0f, 0.0f, 0.0f);
-
-void main_1() {
-  int idx = 0;
-  float4x3 m43 = float4x3(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
-  int ll_1 = 0;
-  int GLF_live6rows = 0;
-  int z = 0;
-  int ll_2 = 0;
-  int ctr = 0;
-  float4x3 tempm43 = float4x3(0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f);
-  int ll_3 = 0;
-  int c = 0;
-  int d = 0;
-  float GLF_live6sums[9] = (float[9])0;
-  idx = 0;
-  m43 = float4x3(float3(1.0f, 0.0f, 0.0f), float3(0.0f, 1.0f, 0.0f), float3(0.0f, 0.0f, 1.0f), (0.0f).xxx);
-  ll_1 = 0;
-  GLF_live6rows = 2;
-  [loop] while (true) {
-    const int x_18 = ll_1;
-    const int x_19 = asint(x_9[0].x);
-    if ((x_18 >= x_19)) {
-      x_GLF_color = float4(1.0f, 0.0f, 0.0f, 1.0f);
-      break;
-    }
-    ll_1 = (ll_1 + 1);
-    const int x_22 = asint(x_9[0].x);
-    z = x_22;
-    ll_2 = 0;
-    ctr = 0;
-    {
-      [loop] for(; (ctr < 1); ctr = (ctr + 1)) {
-        const int x_24 = ll_2;
-        const int x_25 = asint(x_9[0].x);
-        if ((x_24 >= x_25)) {
-          break;
-        }
-        ll_2 = (ll_2 + 1);
-        tempm43 = m43;
-        ll_3 = 0;
-        c = 0;
-        {
-          [loop] for(; (1 < z); c = (c + 1)) {
-            d = 0;
-            set_scalar_float4x3(tempm43, (((d >= 0) & (d < 3)) ? d : 0), (((c >= 0) & (c < 4)) ? c : 0), 1.0f);
-          }
-        }
-        const int x_117 = (((idx >= 0) & (idx < 9)) ? idx : 0);
-        const float x_119 = m43[ctr].y;
-        const float x_121 = GLF_live6sums[x_117];
-        GLF_live6sums[x_117] = (x_121 + x_119);
-      }
-    }
-    idx = (idx + 1);
-  }
-  return;
-}
-
-struct main_out {
-  float4 x_GLF_color_1;
-};
-struct tint_symbol {
-  float4 x_GLF_color_1 : SV_Target0;
-};
-
-main_out main_inner() {
-  main_1();
-  const main_out tint_symbol_2 = {x_GLF_color};
-  return tint_symbol_2;
-}
-
-tint_symbol main() {
-  const main_out inner_result = main_inner();
-  tint_symbol wrapper_result = (tint_symbol)0;
-  wrapper_result.x_GLF_color_1 = inner_result.x_GLF_color_1;
-  return wrapper_result;
-}