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Implement the trivial cases in InstCombine/store.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19950 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-31 05:36:43 +00:00
parent 71dd598023
commit 2f503e6c27
1 changed files with 38 additions and 1 deletions
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39
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -130,6 +130,7 @@ namespace {
Instruction *visitAllocationInst(AllocationInst &AI);
Instruction *visitFreeInst(FreeInst &FI);
Instruction *visitLoadInst(LoadInst &LI);
Instruction *visitStoreInst(StoreInst &SI);
Instruction *visitBranchInst(BranchInst &BI);
Instruction *visitSwitchInst(SwitchInst &SI);
@ -4804,6 +4805,42 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) {
return 0;
}
Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
Value *Val = SI.getOperand(0);
Value *Ptr = SI.getOperand(1);
if (isa<UndefValue>(Ptr)) { // store X, undef -> noop (even if volatile)
removeFromWorkList(&SI);
SI.eraseFromParent();
++NumCombined;
return 0;
}
if (SI.isVolatile()) return 0; // Don't hack volatile loads.
// store X, null -> turns into 'unreachable' in SimplifyCFG
if (isa<ConstantPointerNull>(Ptr)) {
if (!isa<UndefValue>(Val)) {
SI.setOperand(0, UndefValue::get(Val->getType()));
if (Instruction *U = dyn_cast<Instruction>(Val))
WorkList.push_back(U); // Dropped a use.
++NumCombined;
}
return 0; // Do not modify these!
}
// store undef, Ptr -> noop
if (isa<UndefValue>(Val)) {
removeFromWorkList(&SI);
SI.eraseFromParent();
++NumCombined;
return 0;
}
return 0;
}
Instruction *InstCombiner::visitBranchInst(BranchInst &BI) {
// Change br (not X), label True, label False to: br X, label False, True
Value *X;
@ -5039,7 +5076,7 @@ bool InstCombiner::runOnFunction(Function &F) {
// Instructions may end up in the worklist more than once. Erase all
// occurrances of this instruction.
removeFromWorkList(I);
I->getParent()->getInstList().erase(I);
I->eraseFromParent();
} else {
WorkList.push_back(Result);
AddUsersToWorkList(*Result);