From b84d540bc9d70de00b791d0e0deab410d6ba3ad5 Mon Sep 17 00:00:00 2001 From: Rafael Espindola Date: Wed, 22 Feb 2012 03:44:46 +0000 Subject: 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 --- lib/Analysis/ScalarEvolutionExpander.cpp | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'lib/Analysis') diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp index a9473b4..d5f3b74 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(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 -- cgit v1.1