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Revert r50441. The original code was correct. Add some more comments so that I don't make the same mistake in the future.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50446 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-04-29 21:51:00 +00:00
parent 9dcace3caf
commit 02e9988020
1 changed files with 9 additions and 3 deletions
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12
lib/Transforms/Scalar/MemCpyOptimizer.cpp
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@ -668,18 +668,24 @@ bool MemCpyOpt::processMemCpy(MemCpyInst* M) {
CallInst* C = CallInst::Create(MemCpyFun, args.begin(), args.end(), "", M);
// If C and M don't interfere, then this is a valid transformation. If they
// did, this would mean that the two sources overlap, which would be bad.
if (MD.getDependency(C) == MDep) {
MD.dropInstruction(M);
M->eraseFromParent();
NumMemCpyInstr++;
return true;
}
// Otherwise, there was no point in doing this, so we remove the call we
// inserted and act like nothing happened.
MD.removeInstruction(C);
C->eraseFromParent();
NumMemCpyInstr++;
return true;
return false;
}
// MemCpyOpt::runOnFunction - This is the main transformation entry point for a