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improve comment.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130426 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-04-28 20:02:57 +00:00
parent 81199d2545
commit 1e4f44bb8a
1 changed files with 6 additions and 1 deletions
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7
lib/Transforms/Scalar/GVN.cpp
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@ -969,8 +969,13 @@ static Value *GetLoadValueForLoad(LoadInst *SrcVal, unsigned Offset,
NewLoadSize*8-SrcVal->getType()->getPrimitiveSizeInBits());
RV = Builder.CreateTrunc(RV, SrcVal->getType());
SrcVal->replaceAllUsesWith(RV);
// We would like to use gvn.markInstructionForDeletion here, but we can't
// because the load is already memoized into the leader map table that GVN
// tracks. It is potentially possible to remove the load from the table,
// but then there all of the operations based on it would need to be
// rehashed. Just leave the dead load around.
gvn.getMemDep().removeInstruction(SrcVal);
//gvn.markInstructionForDeletion(SrcVal);
SrcVal = NewLoad;
}