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| author | Michael Zolotukhin <mzolotukhin@apple.com> | 2015-09-24 03:50:17 +0000 |
|---|---|---|
| committer | Michael Zolotukhin <mzolotukhin@apple.com> | 2015-09-24 03:50:17 +0000 |
| commit | 74621cced742f10c4ba733793757a73d1bd60fa7 (patch) | |
| tree | 16b1eb657f542a4158663da92cc4065e2c7ebd08 /llvm/lib/Transforms | |
| parent | 0c8decd108de8e788b8214f9f5a542236b78b9c5 (diff) | |
| download | bcm5719-llvm-74621cced742f10c4ba733793757a73d1bd60fa7.tar.gz bcm5719-llvm-74621cced742f10c4ba733793757a73d1bd60fa7.zip | |
Add CFG Simplification pass after Loop Unswitching.
Loop unswitching produces conditional branches with constant condition,
and it's beneficial for later passes to clean this up with simplify-cfg.
We do this after the second invocation of loop-unswitch, but not after
the first one. Not doing so might cause problem for passes like
LoopUnroll, whose estimate of loop body size would be less accurate.
Reviewers: hfinkel
Differential Revision: http://reviews.llvm.org/D13064
llvm-svn: 248460
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/IPO/PassManagerBuilder.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp index fcb62db06e9..77c2de035f7 100644 --- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp +++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp @@ -260,6 +260,7 @@ void PassManagerBuilder::populateModulePassManager( MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1)); MPM.add(createLICMPass()); // Hoist loop invariants MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3)); + MPM.add(createCFGSimplificationPass()); MPM.add(createInstructionCombiningPass()); MPM.add(createIndVarSimplifyPass()); // Canonicalize indvars MPM.add(createLoopIdiomPass()); // Recognize idioms like memset. |
