[spirv-reader] Add FMul

Bug: tint:3
Change-Id: I2f7f9f451889d394b22bc297d511ee5fe92b7a85
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/19502
Reviewed-by: dan sinclair <dsinclair@google.com>
diff --git a/src/reader/spirv/function.cc b/src/reader/spirv/function.cc
index d035867..a1f92ef 100644
--- a/src/reader/spirv/function.cc
+++ b/src/reader/spirv/function.cc
@@ -44,6 +44,8 @@
       return ast::BinaryOp::kAdd;
     case SpvOpFSub:
       return ast::BinaryOp::kSubtract;
+    case SpvOpFMul:
+      return ast::BinaryOp::kMultiply;
     default:
       break;
   }
diff --git a/src/reader/spirv/function_arithmetic_test.cc b/src/reader/spirv/function_arithmetic_test.cc
index 25e948f..888bdbb 100644
--- a/src/reader/spirv/function_arithmetic_test.cc
+++ b/src/reader/spirv/function_arithmetic_test.cc
@@ -213,6 +213,18 @@
                    "__vec_2__f32", AstFor("v2float_50_60"), "subtract",
                    AstFor("v2float_60_50")}));
 
+INSTANTIATE_TEST_SUITE_P(
+    SpvParserTest_FMul,
+    SpvBinaryTest,
+    ::testing::Values(
+        // Scalar float
+        BinaryData{"float", "float_50", "OpFMul", "float_60", "__f32",
+                   "ScalarConstructor{50.000000}", "multiply",
+                   "ScalarConstructor{60.000000}"},
+        // Vector float
+        BinaryData{"v2float", "v2float_50_60", "OpFMul", "v2float_60_50",
+                   "__vec_2__f32", AstFor("v2float_50_60"), "multiply",
+                   AstFor("v2float_60_50")}));
 
 }  // namespace
 }  // namespace spirv