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If we see: 

%A = alloca int
  %V = load int* %A

value number %V to undef, not 0.

llvm-svn: 19905
This commit is contained in:
Chris Lattner 2005-01-29 05:57:01 +00:00
parent 2295d0b7de
commit b25abcb1fa
1 changed files with 3 additions and 4 deletions
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7
llvm/lib/Analysis/LoadValueNumbering.cpp
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@ -22,7 +22,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/LoadValueNumbering.h"
#include "llvm/Constant.h"
#include "llvm/Constants.h"
#include "llvm/Function.h"
#include "llvm/Instructions.h"
#include "llvm/Pass.h"
@ -357,11 +357,10 @@ void LoadVN::getEqualNumberNodes(Value *V,
Instrs.erase(I);
} else if (AllocationInst *AI = dyn_cast<AllocationInst>(I)) {
// If we run into an allocation of the value being loaded, then the
// contenxt are not initialized. We can return any value, so we will
// return a zero.
// contents are not initialized.
if (Allocations.count(AI)) {
LoadInvalidatedInBBBefore = true;
RetVals.push_back(Constant::getNullValue(LI->getType()));
RetVals.push_back(UndefValue::get(LI->getType()));
break;
}
}