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Divergence analysis for GPU programs

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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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234567 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu
2015-04-10 05:03:50 +00:00
parent d480d308b0
commit 5733100450
14 changed files with 642 additions and 1 deletions
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7
include/llvm/Analysis/Passes.h
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@@ -136,6 +136,13 @@ namespace llvm {
//
FunctionPass *createDelinearizationPass();
//===--------------------------------------------------------------------===//
//
// createDivergenceAnalysisPass - This pass determines which branches in a GPU
// program are divergent.
//
FunctionPass *createDivergenceAnalysisPass();
//===--------------------------------------------------------------------===//
//
// Minor pass prototypes, allowing us to expose them through bugpoint and