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Improve comment. Thanks for Andrew for the suggestion.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151127 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2012-02-22 03:44:46 +00:00
parent 919a503458
commit b84d540bc9
1 changed files with 3 additions and 2 deletions
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5
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -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