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Add a DEBUG() output to GVN that prints the instruction clobbering a load.

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This is useful when trying to figure out why GVN didn't eliminate redundant
loads.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72565 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Torok Edwin 2009-05-29 09:46:03 +00:00
parent 246ddf55d1
commit 3f3c6d4e5b
1 changed files with 11 additions and 1 deletions
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12
lib/Transforms/Scalar/GVN.cpp
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@ -1158,8 +1158,18 @@ bool GVN::processLoad(LoadInst *L, SmallVectorImpl<Instruction*> &toErase) {
MemDepResult dep = MD->getDependency(L);
// If the value isn't available, don't do anything!
if (dep.isClobber())
if (dep.isClobber()) {
DEBUG(
// fast print dep, using operator<< on instruction would be too slow
DOUT << "GVN: load ";
WriteAsOperand(*DOUT.stream(), L);
Instruction *I = dep.getInst();
DOUT << " is clobbered by " << I->getOpcodeName() << " instruction ";
WriteAsOperand(*DOUT.stream(), I, false);
DOUT << "\n";
);
return false;
}
// If it is defined in another block, try harder.
if (dep.isNonLocal())