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Free instructions kill values too. This implements DeadStoreElim/free.llx

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15199 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-07-25 07:58:38 +00:00
parent 9ec6e46ad8
commit a9e2f3d0ab
1 changed files with 13 additions and 4 deletions
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17
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@ -79,7 +79,8 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
}
#endif
if (!isa<StoreInst>(I) || cast<StoreInst>(I)->isVolatile()) {
if (!isa<FreeInst>(I) &&
(!isa<StoreInst>(I) || cast<StoreInst>(I)->isVolatile())) {
// If this is a non-store instruction, it makes everything referenced no
// longer killed. Remove anything aliased from the alias set tracker.
KillLocs.remove(I);
@ -90,8 +91,16 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
// the stored location is already in the tracker, then this is a dead
// store. We can just delete it here, but while we're at it, we also
// delete any trivially dead expression chains.
unsigned ValSize = TD.getTypeSize(I->getOperand(0)->getType());
Value *Ptr = I->getOperand(1);
unsigned ValSize;
Value *Ptr;
if (isa<StoreInst>(I)) {
Ptr = I->getOperand(1);
ValSize = TD.getTypeSize(I->getOperand(0)->getType());
} else {
Ptr = I->getOperand(0);
ValSize = ~0;
}
if (AliasSet *AS = KillLocs.getAliasSetForPointerIfExists(Ptr, ValSize))
for (AliasSet::iterator ASI = AS->begin(), E = AS->end(); ASI != E; ++ASI)
if (AA.alias(ASI.getPointer(), ASI.getSize(), Ptr, ValSize)
@ -110,7 +119,7 @@ bool DSE::runOnBasicBlock(BasicBlock &BB) {
// Otherwise, this is a non-dead store just add it to the set of dead
// locations.
KillLocs.add(cast<StoreInst>(I));
KillLocs.add(I);
BigContinue:;
}
return MadeChange;