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Don't bother value numbering instructions with void types in GVN. In theory this should allow us to insert

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fewer things into the value numbering maps, but any speedup is beneath the noise threshold on my machine
on 403.gcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122844 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2011-01-04 22:15:21 +00:00
parent 631ee4b89f
commit 2cf7537dc6
1 changed files with 4 additions and 0 deletions
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4
lib/Transforms/Scalar/GVN.cpp
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@ -1685,6 +1685,10 @@ bool GVN::processInstruction(Instruction *I,
return false;
}
// Instructions with void type don't return a value, so there's
// no point in trying to find redudancies in them.
if (I->getType()->isVoidTy()) return false;
uint32_t NextNum = VN.getNextUnusedValueNumber();
unsigned Num = VN.lookup_or_add(I);