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Implement builtin_return_address(x) and builtin_frame_address(x)

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on PPC for x!=0.  7624113.

llvm-svn: 102972
This commit is contained in:
Dale Johannesen 2010-05-03 22:59:34 +00:00
parent b8016872b6
commit b10ca6bf4c
2 changed files with 58 additions and 23 deletions
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57
lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -4298,7 +4298,7 @@ SDValue PPCTargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op,
// Create a stack slot that is 16-byte aligned.
MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
int FrameIdx = FrameInfo->CreateStackObject(16, 16, false);
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
EVT PtrVT = getPointerTy();
SDValue FIdx = DAG.getFrameIndex(FrameIdx, PtrVT);
// Store the input value into Value#0 of the stack slot.
@ -5497,45 +5497,56 @@ bool PPCTargetLowering::isLegalAddressImmediate(llvm::GlobalValue* GV) const {
SDValue PPCTargetLowering::LowerRETURNADDR(SDValue Op,
SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
// Depths > 0 not supported yet!
if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() > 0)
return SDValue();
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
// Make sure the function does not optimize away the store of the RA to
// the stack.
MachineFunction &MF = DAG.getMachineFunction();
PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
FuncInfo->setLRStoreRequired();
bool isPPC64 = PPCSubTarget.isPPC64();
bool isDarwinABI = PPCSubTarget.isDarwinABI();
if (Depth > 0) {
SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
SDValue Offset =
DAG.getConstant(PPCFrameInfo::getReturnSaveOffset(isPPC64, isDarwinABI),
isPPC64? MVT::i64 : MVT::i32);
return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
DAG.getNode(ISD::ADD, dl, getPointerTy(),
FrameAddr, Offset),
NULL, 0, false, false, 0);
}
// Just load the return address off the stack.
SDValue RetAddrFI = getReturnAddrFrameIndex(DAG);
// Make sure the function really does not optimize away the store of the RA
// to the stack.
FuncInfo->setLRStoreRequired();
return DAG.getLoad(getPointerTy(), dl,
DAG.getEntryNode(), RetAddrFI, NULL, 0,
false, false, 0);
return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
RetAddrFI, NULL, 0, false, false, 0);
}
SDValue PPCTargetLowering::LowerFRAMEADDR(SDValue Op,
SelectionDAG &DAG) const {
DebugLoc dl = Op.getDebugLoc();
// Depths > 0 not supported yet!
if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() > 0)
return SDValue();
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
EVT PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
bool isPPC64 = PtrVT == MVT::i64;
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
bool is31 = (DisableFramePointerElim(MF) || MFI->hasVarSizedObjects())
&& MFI->getStackSize();
if (isPPC64)
return DAG.getCopyFromReg(DAG.getEntryNode(), dl, is31 ? PPC::X31 : PPC::X1,
MVT::i64);
else
return DAG.getCopyFromReg(DAG.getEntryNode(), dl, is31 ? PPC::R31 : PPC::R1,
MVT::i32);
MFI->setFrameAddressIsTaken(true);
bool is31 = (DisableFramePointerElim(MF) || MFI->hasVarSizedObjects()) &&
MFI->getStackSize() &&
!MF.getFunction()->hasFnAttr(Attribute::Naked);
unsigned FrameReg = isPPC64 ? (is31 ? PPC::X31 : PPC::X1) :
(is31 ? PPC::R31 : PPC::R1);
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg,
PtrVT);
while (Depth--)
FrameAddr = DAG.getLoad(Op.getValueType(), dl, DAG.getEntryNode(),
FrameAddr, NULL, 0, false, false, 0);
return FrameAddr;
}
bool

24
test/CodeGen/PowerPC/2010-05-03-retaddr1.ll Normal file
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@ -0,0 +1,24 @@
; RUN: llc < %s -march=ppc32 -mtriple=powerpc-apple-darwin -mcpu=g5 | FileCheck %s
declare i8* @llvm.frameaddress(i32) nounwind readnone
define i8* @g2() nounwind readnone {
entry:
; CHECK: _g2:
; CHECK: lwz r3, 0(r1)
%0 = tail call i8* @llvm.frameaddress(i32 1) ; <i8*> [#uses=1]
ret i8* %0
}
declare i8* @llvm.returnaddress(i32) nounwind readnone
define i8* @g() nounwind readnone {
entry:
; CHECK: _g:
; CHECK: mflr r0
; CHECK: stw r0, 8(r1)
; CHECK: lwz r3, 0(r1)
; CHECK: lwz r3, 8(r3)
%0 = tail call i8* @llvm.returnaddress(i32 1) ; <i8*> [#uses=1]
ret i8* %0
}