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Create a stack slot for the return address lazily instead of eagerly. This

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save small amounts of time for functions that don't call llvm.returnaddress
or llvm.frameaddress (which is almost all functions).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19006 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-12-17 00:07:46 +00:00
parent acd6782470
commit 11cf7aa775
1 changed files with 8 additions and 4 deletions
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12
lib/Target/X86/X86ISelSimple.cpp
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@ -96,6 +96,9 @@ namespace {
/// the entire function.
///
bool runOnFunction(Function &Fn) {
// Lazily create a stack slot for the return address if needed.
ReturnAddressIndex = -1;
// First pass over the function, lower any unknown intrinsic functions
// with the IntrinsicLowering class.
LowerUnknownIntrinsicFunctionCalls(Fn);
@ -108,10 +111,6 @@ namespace {
BB = &F->front();
// Set up a frame object for the return address. This is used by the
// llvm.returnaddress & llvm.frameaddress intrinisics.
ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
// Copy incoming arguments off of the stack...
LoadArgumentsToVirtualRegs(Fn);
@ -1765,6 +1764,11 @@ void X86ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
case Intrinsic::frameaddress:
TmpReg1 = getReg(CI);
if (cast<Constant>(CI.getOperand(1))->isNullValue()) {
if (ReturnAddressIndex == -1) {
// Set up a frame object for the return address.
ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
}
if (ID == Intrinsic::returnaddress) {
// Just load the return address
addFrameReference(BuildMI(BB, X86::MOV32rm, 4, TmpReg1),