[PATCH] Divergence analysis for GPU programs

[Jingyue Wu]

+ Tom

On Mon, Mar 23, 2015 at 10:14 PM Jingyue Wu <jingyue at google.com> wrote:

> Hi resistor, hfinkel, eliben, meheff,
>
> 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.
>
> http://reviews.llvm.org/D8576
>
> Files:
>   include/llvm/Analysis/Passes.h
>   include/llvm/Analysis/TargetTransformInfo.h
>   include/llvm/Analysis/TargetTransformInfoImpl.h
>   include/llvm/CodeGen/BasicTTIImpl.h
>   include/llvm/InitializePasses.h
>   include/llvm/LinkAllPasses.h
>   lib/Analysis/Analysis.cpp
>   lib/Analysis/CMakeLists.txt
>   lib/Analysis/DivergenceAnalysis.cpp
>   lib/Analysis/TargetTransformInfo.cpp
>   lib/Target/NVPTX/NVPTXTargetTransformInfo.cpp
>   lib/Target/NVPTX/NVPTXTargetTransformInfo.h
>   test/Analysis/DivergenceAnalysis/NVPTX/diverge.ll
>   test/Analysis/DivergenceAnalysis/NVPTX/lit.local.cfg
>
> EMAIL PREFERENCES
>   http://reviews.llvm.org/settings/panel/emailpreferences/
>
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