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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2012-02-22 03:44:46 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2012-02-22 03:44:46 +0000 |
| commit | 337cfaf75734ebef1ac1d400399eacbbb866ac4d (patch) | |
| tree | ffd3cbf98f1bbe2bfc32ec243e0a0e053221bc30 /llvm/lib/Analysis/ScalarEvolutionExpander.cpp | |
| parent | 0716b50db68e187b7f39844aeed0155280831d2d (diff) | |
| download | bcm5719-llvm-337cfaf75734ebef1ac1d400399eacbbb866ac4d.tar.gz bcm5719-llvm-337cfaf75734ebef1ac1d400399eacbbb866ac4d.zip | |
Improve comment. Thanks for Andrew for the suggestion.
llvm-svn: 151127
Diffstat (limited to 'llvm/lib/Analysis/ScalarEvolutionExpander.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ScalarEvolutionExpander.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp index a9473b4c49a..d5f3b745169 100644 --- a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp +++ b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp @@ -53,8 +53,9 @@ Value *SCEVExpander::ReuseOrCreateCast(Value *V, Type *Ty, if (U->getType() == Ty) if (CastInst *CI = dyn_cast<CastInst>(U)) if (CI->getOpcode() == Op) { - // If the cast isn't where we want it or if it doesn't dominate - // a use in BIP, fix it. + // If the cast isn't where we want it, create a new cast at IP. + // Likewise, do not reuse a cast at BIP because it must dominate + // instructions that might be inserted before BIP. if (BasicBlock::iterator(CI) != IP || BIP == IP) { // Create a new cast, and leave the old cast in place in case // it is being used as an insert point. Clear its operand |
