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[AMDGPU] AMDGPULateCodeGenPrepare Legacy PM: replace setPreservesAll() with setPreservesCFG() #148167

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Merged
arsenm merged 9 commits into from
Aug 12, 2025
Merged

[AMDGPU] AMDGPULateCodeGenPrepare Legacy PM: replace setPreservesAll() with setPreservesCFG() #148167

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90f1d0a
set legacy PM UniformityInfoWrapperPass isCFGOnly to false
J-MR-T Jul 11, 2025
fceacd0
also change isCFGOnly in BEGIN macro
J-MR-T Jul 11, 2025
d64e5cb
[NFC] get rid of comment as discussed
J-MR-T Jul 11, 2025
5912dc6
[AMDGPU] AMDGPULateCodeGenPrepare: legacy-pm replace setPreservesAll(…
J-MR-T Jul 11, 2025
196cbcf
[NFC] comments
J-MR-T Jul 11, 2025
9b81632
[NFC] adjust comment
J-MR-T Jul 11, 2025
5f558ec
[NFC] adjust comment, see review
J-MR-T Jul 12, 2025
3c02b8a
Add comment
arsenm Aug 12, 2025
f96af5e
trailing whitespace
arsenm Aug 12, 2025
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4 changes: 2 additions & 2 deletions llvm/lib/Analysis/UniformityAnalysis.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -146,12 +146,12 @@ char UniformityInfoWrapperPass::ID = 0;
UniformityInfoWrapperPass::UniformityInfoWrapperPass() : FunctionPass(ID) {}

INITIALIZE_PASS_BEGIN(UniformityInfoWrapperPass, "uniformity",
"Uniformity Analysis", true, true)
"Uniformity Analysis", false, true)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(CycleInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
INITIALIZE_PASS_END(UniformityInfoWrapperPass, "uniformity",
"Uniformity Analysis", true, true)
"Uniformity Analysis", false, true)

void UniformityInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
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3 changes: 2 additions & 1 deletion llvm/lib/Target/AMDGPU/AMDGPULateCodeGenPrepare.cpp
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Expand Up @@ -546,7 +546,8 @@ class AMDGPULateCodeGenPrepareLegacy : public FunctionPass {
AU.addRequired<TargetPassConfig>();
AU.addRequired<AssumptionCacheTracker>();
AU.addRequired<UniformityInfoWrapperPass>();
AU.setPreservesAll();
// Invalidates UniformityInfo
AU.setPreservesCFG();
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@arsenm arsenm Aug 12, 2025

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Can you comment this invalidates uniformity

}

bool runOnFunction(Function &F) override;
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4 changes: 4 additions & 0 deletions llvm/test/CodeGen/AMDGPU/llc-pipeline.ll
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Expand Up @@ -255,6 +255,7 @@
; GCN-O1-NEXT: Uniformity Analysis
; GCN-O1-NEXT: AMDGPU IR late optimizations
; GCN-O1-NEXT: Post-Dominator Tree Construction
; GCN-O1-NEXT: Uniformity Analysis
; GCN-O1-NEXT: Unify divergent function exit nodes
; GCN-O1-NEXT: Dominator Tree Construction
; GCN-O1-NEXT: Cycle Info Analysis
Expand Down Expand Up @@ -557,6 +558,7 @@
; GCN-O1-OPTS-NEXT: Uniformity Analysis
; GCN-O1-OPTS-NEXT: AMDGPU IR late optimizations
; GCN-O1-OPTS-NEXT: Post-Dominator Tree Construction
; GCN-O1-OPTS-NEXT: Uniformity Analysis
; GCN-O1-OPTS-NEXT: Unify divergent function exit nodes
; GCN-O1-OPTS-NEXT: Dominator Tree Construction
; GCN-O1-OPTS-NEXT: Cycle Info Analysis
Expand Down Expand Up @@ -871,6 +873,7 @@
; GCN-O2-NEXT: Uniformity Analysis
; GCN-O2-NEXT: AMDGPU IR late optimizations
; GCN-O2-NEXT: Post-Dominator Tree Construction
; GCN-O2-NEXT: Uniformity Analysis
; GCN-O2-NEXT: Unify divergent function exit nodes
; GCN-O2-NEXT: Dominator Tree Construction
; GCN-O2-NEXT: Cycle Info Analysis
Expand Down Expand Up @@ -1200,6 +1203,7 @@
; GCN-O3-NEXT: Uniformity Analysis
; GCN-O3-NEXT: AMDGPU IR late optimizations
; GCN-O3-NEXT: Post-Dominator Tree Construction
; GCN-O3-NEXT: Uniformity Analysis
; GCN-O3-NEXT: Unify divergent function exit nodes
; GCN-O3-NEXT: Dominator Tree Construction
; GCN-O3-NEXT: Cycle Info Analysis
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