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| author | Jingyue Wu <jingyue@google.com> | 2015-04-10 05:03:50 +0000 |
|---|---|---|
| committer | Jingyue Wu <jingyue@google.com> | 2015-04-10 05:03:50 +0000 |
| commit | 5da831cc3109ff1fc5c8f43be2cf1a1f52e030da (patch) | |
| tree | bc580cdb0efc9fce2e03473d920d295c31a16e78 /llvm/lib/Analysis/TargetTransformInfo.cpp | |
| parent | 5c65f58f6487dd5d9dec43d927dd9842e8b72ba2 (diff) | |
| download | llvm-5da831cc3109ff1fc5c8f43be2cf1a1f52e030da.zip llvm-5da831cc3109ff1fc5c8f43be2cf1a1f52e030da.tar.gz llvm-5da831cc3109ff1fc5c8f43be2cf1a1f52e030da.tar.bz2 | |
Divergence analysis for GPU programs
Summary:
Some optimizations such as jump threading and loop unswitching can negatively
affect performance when applied to divergent branches. The divergence analysis
added in this patch conservatively estimates which branches in a GPU program
can diverge. This information can then help LLVM to run certain optimizations
selectively.
Test Plan: test/Analysis/DivergenceAnalysis/NVPTX/diverge.ll
Reviewers: resistor, hfinkel, eliben, meheff, jholewinski
Subscribers: broune, bjarke.roune, madhur13490, tstellarAMD, dberlin, echristo, jholewinski, llvm-commits
Differential Revision: http://reviews.llvm.org/D8576
llvm-svn: 234567
Diffstat (limited to 'llvm/lib/Analysis/TargetTransformInfo.cpp')
| -rw-r--r-- | llvm/lib/Analysis/TargetTransformInfo.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp index f51c7f5..a1519de 100644 --- a/llvm/lib/Analysis/TargetTransformInfo.cpp +++ b/llvm/lib/Analysis/TargetTransformInfo.cpp @@ -76,6 +76,10 @@ bool TargetTransformInfo::hasBranchDivergence() const { return TTIImpl->hasBranchDivergence(); } +bool TargetTransformInfo::isSourceOfDivergence(const Value *V) const { + return TTIImpl->isSourceOfDivergence(V); +} + bool TargetTransformInfo::isLoweredToCall(const Function *F) const { return TTIImpl->isLoweredToCall(F); } |