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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 | b84d540bc9d70de00b791d0e0deab410d6ba3ad5 (patch) | |
| tree | 35c7a1563d1daaa31e48a922614a868ef8a3739c /lib/Analysis/ScalarEvolutionExpander.cpp | |
| parent | 919a503458c18472984c7c37b305110c9ba3a782 (diff) | |
Improve comment. Thanks for Andrew for the suggestion.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151127 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolutionExpander.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolutionExpander.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp index a9473b4c49..d5f3b74516 100644 --- a/lib/Analysis/ScalarEvolutionExpander.cpp +++ b/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 |