diagnostic_filtering/for_loop_attribute.wgsl:5:21 warning: 'dpdx' must only be called from uniform control flow
  for (; x > v.x && dpdx(1.0) > 0.0; ) {
                    ^^^^^^^^^

diagnostic_filtering/for_loop_attribute.wgsl:5:3 note: control flow depends on possibly non-uniform value
  for (; x > v.x && dpdx(1.0) > 0.0; ) {
  ^^^

diagnostic_filtering/for_loop_attribute.wgsl:5:21 note: return value of 'dpdx' may be non-uniform
  for (; x > v.x && dpdx(1.0) > 0.0; ) {
                    ^^^^^^^^^

; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 39
; Schema: 0
               OpCapability Shader
               OpMemoryModel Logical GLSL450
               OpEntryPoint Fragment %main "main" %x_1
               OpExecutionMode %main OriginUpperLeft
               OpName %x_1 "x_1"
               OpName %main_inner "main_inner"
               OpName %x "x"
               OpName %v "v"
               OpName %main "main"
               OpDecorate %x_1 Location 0
      %float = OpTypeFloat 32
%_ptr_Input_float = OpTypePointer Input %float
        %x_1 = OpVariable %_ptr_Input_float Input
       %void = OpTypeVoid
          %4 = OpTypeFunction %void %float
    %v4float = OpTypeVector %float 4
         %10 = OpConstantNull %v4float
%_ptr_Function_v4float = OpTypePointer Function %v4float
       %uint = OpTypeInt 32 0
     %uint_0 = OpConstant %uint 0
%_ptr_Function_float = OpTypePointer Function %float
       %bool = OpTypeBool
    %float_1 = OpConstant %float 1
         %29 = OpConstantNull %float
         %34 = OpTypeFunction %void
 %main_inner = OpFunction %void None %4
          %x = OpFunctionParameter %float
          %8 = OpLabel
          %v = OpVariable %_ptr_Function_v4float Function %10
               OpStore %v %10
               OpBranch %13
         %13 = OpLabel
               OpLoopMerge %14 %15 None
               OpBranch %16
         %16 = OpLabel
         %21 = OpAccessChain %_ptr_Function_float %v %uint_0
         %22 = OpLoad %float %21
         %23 = OpFOrdGreaterThan %bool %x %22
               OpSelectionMerge %25 None
               OpBranchConditional %23 %26 %25
         %26 = OpLabel
         %27 = OpDPdx %float %float_1
         %30 = OpFOrdGreaterThan %bool %27 %29
               OpBranch %25
         %25 = OpLabel
         %31 = OpPhi %bool %23 %16 %30 %26
         %17 = OpLogicalNot %bool %31
               OpSelectionMerge %32 None
               OpBranchConditional %17 %33 %32
         %33 = OpLabel
               OpBranch %14
         %32 = OpLabel
               OpBranch %15
         %15 = OpLabel
               OpBranch %13
         %14 = OpLabel
               OpReturn
               OpFunctionEnd
       %main = OpFunction %void None %34
         %36 = OpLabel
         %38 = OpLoad %float %x_1
         %37 = OpFunctionCall %void %main_inner %38
               OpReturn
               OpFunctionEnd