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Do not check use_empty() before replaceAllUsesWith(). This gives ValueHandles a chance to get properly updated.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84033 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-10-13 21:41:20 +00:00
parent e5f879825f
commit 1bf5ebc7be
3 changed files with 11 additions and 15 deletions
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15
lib/Transforms/Scalar/InstructionCombining.cpp
View File

@ -9979,8 +9979,7 @@ Instruction *InstCombiner::visitCallSite(CallSite CS) {
new StoreInst(ConstantInt::getTrue(*Context),
UndefValue::get(Type::getInt1PtrTy(*Context)),
OldCall);
if (!OldCall->use_empty())
OldCall->replaceAllUsesWith(UndefValue::get(OldCall->getType()));
OldCall->replaceAllUsesWith(UndefValue::get(OldCall->getType()));
if (isa<CallInst>(OldCall)) // Not worth removing an invoke here.
return EraseInstFromFunction(*OldCall);
return 0;
@ -9994,9 +9993,8 @@ Instruction *InstCombiner::visitCallSite(CallSite CS) {
UndefValue::get(Type::getInt1PtrTy(*Context)),
CS.getInstruction());
if (!CS.getInstruction()->use_empty())
CS.getInstruction()->
replaceAllUsesWith(UndefValue::get(CS.getInstruction()->getType()));
CS.getInstruction()->
replaceAllUsesWith(UndefValue::get(CS.getInstruction()->getType()));
if (InvokeInst *II = dyn_cast<InvokeInst>(CS.getInstruction())) {
// Don't break the CFG, insert a dummy cond branch.
@ -10251,7 +10249,7 @@ bool InstCombiner::transformConstExprCastCall(CallSite CS) {
}
}
if (!Caller->use_empty())
Caller->replaceAllUsesWith(NV);
@ -10398,7 +10396,7 @@ Instruction *InstCombiner::transformCallThroughTrampoline(CallSite CS) {
setCallingConv(cast<CallInst>(Caller)->getCallingConv());
cast<CallInst>(NewCaller)->setAttributes(NewPAL);
}
if (Caller->getType() != Type::getVoidTy(*Context) && !Caller->use_empty())
if (Caller->getType() != Type::getVoidTy(*Context))
Caller->replaceAllUsesWith(NewCaller);
Caller->eraseFromParent();
Worklist.Remove(Caller);
@ -12781,8 +12779,7 @@ bool InstCombiner::DoOneIteration(Function &F, unsigned Iteration) {
++NumDeadInst;
MadeIRChange = true;
}
if (!I->use_empty())
I->replaceAllUsesWith(UndefValue::get(I->getType()));
I->replaceAllUsesWith(UndefValue::get(I->getType()));
I->eraseFromParent();
}
}

8
lib/Transforms/Scalar/LICM.cpp
View File

@ -486,8 +486,8 @@ void LICM::sink(Instruction &I) {
if (!isExitBlockDominatedByBlockInLoop(ExitBlocks[0], I.getParent())) {
// Instruction is not used, just delete it.
CurAST->deleteValue(&I);
if (!I.use_empty()) // If I has users in unreachable blocks, eliminate.
I.replaceAllUsesWith(UndefValue::get(I.getType()));
// If I has users in unreachable blocks, eliminate.
I.replaceAllUsesWith(UndefValue::get(I.getType()));
I.eraseFromParent();
} else {
// Move the instruction to the start of the exit block, after any PHI
@ -499,8 +499,8 @@ void LICM::sink(Instruction &I) {
} else if (ExitBlocks.empty()) {
// The instruction is actually dead if there ARE NO exit blocks.
CurAST->deleteValue(&I);
if (!I.use_empty()) // If I has users in unreachable blocks, eliminate.
I.replaceAllUsesWith(UndefValue::get(I.getType()));
// If I has users in unreachable blocks, eliminate.
I.replaceAllUsesWith(UndefValue::get(I.getType()));
I.eraseFromParent();
} else {
// Otherwise, if we have multiple exits, use the PromoteMem2Reg function to

3
lib/Transforms/Scalar/LoopUnswitch.cpp
View File

@ -781,8 +781,7 @@ void LoopUnswitch::RemoveBlockIfDead(BasicBlock *BB,
// Anything that uses the instructions in this basic block should have their
// uses replaced with undefs.
if (!I->use_empty())
I->replaceAllUsesWith(UndefValue::get(I->getType()));
I->replaceAllUsesWith(UndefValue::get(I->getType()));
}
// If this is the edge to the header block for a loop, remove the loop and