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Simplify this a tiny bit by using the new IntrinsicInst functionality.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25292 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-01-13 20:11:04 +00:00
parent b419b0e682
commit 8b0ea313d9
1 changed files with 12 additions and 7 deletions
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19
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4620,12 +4620,17 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
}
// CallInst simplification
//
/// visitCallInst - CallInst simplification. This mostly only handles folding
/// of intrinsic instructions. For normal calls, it allows visitCallSite to do
/// the heavy lifting.
///
Instruction *InstCombiner::visitCallInst(CallInst &CI) {
IntrinsicInst *II = dyn_cast<IntrinsicInst>(&CI);
if (!II) return visitCallSite(&CI);
// Intrinsics cannot occur in an invoke, so handle them here instead of in
// visitCallSite.
if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(&CI)) {
if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(II)) {
bool Changed = false;
// memmove/cpy/set of zero bytes is a noop.
@ -4645,7 +4650,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
// If we have a memmove and the source operation is a constant global,
// then the source and dest pointers can't alias, so we can change this
// into a call to memcpy.
if (MemMoveInst *MMI = dyn_cast<MemMoveInst>(MI))
if (MemMoveInst *MMI = dyn_cast<MemMoveInst>(II))
if (GlobalVariable *GVSrc = dyn_cast<GlobalVariable>(MMI->getSource()))
if (GVSrc->isConstant()) {
Module *M = CI.getParent()->getParent()->getParent();
@ -4655,8 +4660,8 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
Changed = true;
}
if (Changed) return &CI;
} else if (DbgStopPointInst *SPI = dyn_cast<DbgStopPointInst>(&CI)) {
if (Changed) return II;
} else if (DbgStopPointInst *SPI = dyn_cast<DbgStopPointInst>(II)) {
// If this stoppoint is at the same source location as the previous
// stoppoint in the chain, it is not needed.
if (DbgStopPointInst *PrevSPI =
@ -4668,7 +4673,7 @@ Instruction *InstCombiner::visitCallInst(CallInst &CI) {
}
}
return visitCallSite(&CI);
return visitCallSite(II);
}
// InvokeInst simplification