File: loop.spv

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llvm-toolchain-20 1%3A20.1.8-1
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; RUN: %if spirv-tools %{ spirv-as %s -o - | spirv-val - %}
; RUN: spirv-sim --function=simple --wave=4 --expects=0,2,2,4 -i %s
               OpCapability Shader
               OpCapability GroupNonUniform
               OpMemoryModel Logical GLSL450
               OpEntryPoint GLCompute %main "main" %WaveIndex
               OpExecutionMode %main LocalSize 1 1 1
               OpSource HLSL 670
               OpName %simple "simple"
               OpName %main "main"
                OpDecorate %WaveIndex BuiltIn SubgroupLocalInvocationId
        %int = OpTypeInt 32 1
       %uint = OpTypeInt 32 0
       %bool = OpTypeBool
      %int_2 = OpConstant %int 2
      %int_5 = OpConstant %int 5
      %int_6 = OpConstant %int 6
     %uint_0 = OpConstant %uint 0
     %uint_2 = OpConstant %uint 2
       %void = OpTypeVoid
  %main_type = OpTypeFunction %void
%simple_type = OpTypeFunction %int
  %uint_iptr = OpTypePointer Input %uint
  %uint_fptr = OpTypePointer Function %uint
  %WaveIndex = OpVariable %uint_iptr Input
       %main = OpFunction %void None %main_type
      %unused = OpLabel
               OpReturn
               OpFunctionEnd
     %simple = OpFunction %int None %simple_type
      %entry = OpLabel
; uint i = 0;
          %i = OpVariable %uint_fptr Function
          %1 = OpLoad %uint %WaveIndex
               OpStore %i %uint_0
               OpBranch %header
     %header = OpLabel
          %2 = OpLoad %uint %i
          %3 = OpULessThan %bool %2 %1
               OpLoopMerge %merge %continue None
               OpBranchConditional %3 %body %merge
; while (i < WaveGetLaneIndex()) {
;     i += 2;
; }
       %body = OpLabel
               OpBranch %continue
   %continue = OpLabel
          %4 = OpIAdd %uint %2 %uint_2
               OpStore %i %4
               OpBranch %header
      %merge = OpLabel
; return (int) i;
          %5 = OpLoad %uint %i
          %6 = OpBitcast %int %5
               OpReturnValue %6
               OpFunctionEnd