[llvm] [SimplifyCFG] Increase budget for FoldTwoEntryPHINode() if the branch is unpredictable. (PR #98495)
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Thu Jul 18 11:11:03 PDT 2024
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git-clang-format --diff 2a79fd0b92004feac0254ad8a4d4ac09e488c7dc 7d1aff233792c0cc309cf1ee015f993cd2f0e7b7 --extensions cpp,h -- llvm/include/llvm/Analysis/TargetTransformInfo.h llvm/include/llvm/Analysis/TargetTransformInfoImpl.h llvm/lib/Analysis/TargetTransformInfo.cpp llvm/lib/Target/X86/X86TargetTransformInfo.cpp llvm/lib/Target/X86/X86TargetTransformInfo.h llvm/lib/Transforms/Utils/SimplifyCFG.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 94ed8b17f9..baef29dada 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -3550,7 +3550,8 @@ static bool FoldTwoEntryPHINode(PHINode *PN, const TargetTransformInfo &TTI,
// that need to be moved to the dominating block.
SmallPtrSet<Instruction *, 4> AggressiveInsts;
InstructionCost Cost = 0;
- InstructionCost Budget = TwoEntryPHINodeFoldingThreshold * TargetTransformInfo::TCC_Basic;
+ InstructionCost Budget =
+ TwoEntryPHINodeFoldingThreshold * TargetTransformInfo::TCC_Basic;
if (IsUnpredictable)
Budget += TTI.getBranchMispredictPenalty();
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https://github.com/llvm/llvm-project/pull/98495
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