return MFI->getStackSize() && needsFP(MF);
}
+/// usesLR - Returns if the link registers (LR) has been used in the function.
+///
+bool PPCRegisterInfo::usesLR(MachineFunction &MF) const {
+ const bool *PhysRegsUsed = MF.getUsedPhysregs();
+ return PhysRegsUsed[getRARegister()];
+}
+
void PPCRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (!FrameSize) return;
int NegFrameSize = -FrameSize;
-
+
+ // Get processor type.
+ bool IsPPC64 = Subtarget.isPPC64();
+ // Check if the link register (LR) has been used.
+ bool UsesLR = MFI->hasCalls() || usesLR(MF);
// Do we have a frame pointer for this function?
bool HasFP = hasFP(MF);
+
+ int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64);
+ int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64);
+
+ if (IsPPC64) {
+ if (UsesLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::MFLR8), PPC::X0);
+
+ if (HasFP)
+ BuildMI(MBB, MBBI, TII.get(PPC::STD))
+ .addReg(PPC::X31).addImm(FPOffset/4).addReg(PPC::X1);
+
+ if (UsesLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::STD))
+ .addReg(PPC::X0).addImm(LROffset/4).addReg(PPC::X1);
+ } else {
+ if (UsesLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::MFLR), PPC::R0);
+
+ if (HasFP)
+ BuildMI(MBB, MBBI, TII.get(PPC::STW))
+ .addReg(PPC::R31).addImm(FPOffset).addReg(PPC::R1);
- // If there is a frame pointer, copy R31 into TOC(SP)
- if (HasFP) {
- int Offset = PPCFrameInfo::getFramePointerSaveOffset(Subtarget.isPPC64());
-
- if (!Subtarget.isPPC64()) {
+ if (UsesLR)
BuildMI(MBB, MBBI, TII.get(PPC::STW))
- .addReg(PPC::R31).addImm(Offset).addReg(PPC::R1);
- } else {
- BuildMI(MBB, MBBI, TII.get(PPC::STD))
- .addReg(PPC::X31).addImm(Offset/4).addReg(PPC::X1);
- }
+ .addReg(PPC::R0).addImm(LROffset).addReg(PPC::R1);
}
// Get stack alignments.
// Adjust stack pointer: r1 += NegFrameSize.
// If there is a preferred stack alignment, align R1 now
- if (!Subtarget.isPPC64()) {
+ if (!IsPPC64) {
// PPC32.
if (MaxAlign > TargetAlign) {
assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
// If there is a frame pointer, copy R1 into R31
if (HasFP) {
- if (!Subtarget.isPPC64()) {
+ if (!IsPPC64) {
BuildMI(MBB, MBBI, TII.get(PPC::OR), PPC::R31).addReg(PPC::R1)
.addReg(PPC::R1);
} else {
// Get the number of bytes allocated from the FrameInfo.
unsigned FrameSize = MFI->getStackSize();
- if (FrameSize != 0) {
- // The loaded (or persistent) stack pointer value is offset by the 'stwu'
- // on entry to the function. Add this offset back now.
- if (!Subtarget.isPPC64()) {
- if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
- !MFI->hasVarSizedObjects()) {
- BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
- .addReg(PPC::R1).addImm(FrameSize);
- } else {
- BuildMI(MBB, MBBI, TII.get(PPC::LWZ),PPC::R1).addImm(0).addReg(PPC::R1);
- }
+ if (!FrameSize) return;
+
+ // Get processor type.
+ bool IsPPC64 = Subtarget.isPPC64();
+ // Check if the link register (LR) has been used.
+ bool UsesLR = MFI->hasCalls() || usesLR(MF);
+ // Do we have a frame pointer for this function?
+ bool HasFP = hasFP(MF);
+
+ // The loaded (or persistent) stack pointer value is offset by the 'stwu'
+ // on entry to the function. Add this offset back now.
+ if (!Subtarget.isPPC64()) {
+ if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
+ !MFI->hasVarSizedObjects()) {
+ BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
+ .addReg(PPC::R1).addImm(FrameSize);
} else {
- if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
- !MFI->hasVarSizedObjects()) {
- BuildMI(MBB, MBBI, TII.get(PPC::ADDI8), PPC::X1)
- .addReg(PPC::X1).addImm(FrameSize);
- } else {
- BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
- }
+ BuildMI(MBB, MBBI, TII.get(PPC::LWZ),PPC::R1).addImm(0).addReg(PPC::R1);
}
-
- // If this function has a frame pointer, load the saved frame pointer from
- // its stack slot.
- if (hasFP(MF)) {
- int Offset = PPCFrameInfo::getFramePointerSaveOffset(Subtarget.isPPC64());
-
- if (!Subtarget.isPPC64()) {
- BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R31)
- .addImm(Offset).addReg(PPC::R1);
- } else {
- BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X31)
- .addImm(Offset/4).addReg(PPC::X1);
- }
+ } else {
+ if (isInt16(FrameSize) && TargetAlign >= MaxAlign &&
+ !MFI->hasVarSizedObjects()) {
+ BuildMI(MBB, MBBI, TII.get(PPC::ADDI8), PPC::X1)
+ .addReg(PPC::X1).addImm(FrameSize);
+ } else {
+ BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
}
-
+ }
+
+ int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64);
+ int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64);
+
+ if (IsPPC64) {
+ if (UsesLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X0)
+ .addImm(LROffset/4).addReg(PPC::X1);
+
+ if (HasFP)
+ BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X31)
+ .addImm(FPOffset/4).addReg(PPC::X1);
+
+ if (UsesLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::MTLR8)).addReg(PPC::X0);
+ } else {
+ if (UsesLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R0)
+ .addImm(LROffset).addReg(PPC::R1);
+
+ if (HasFP)
+ BuildMI(MBB, MBBI, TII.get(PPC::LWZ), PPC::R31)
+ .addImm(FPOffset).addReg(PPC::R1);
+
+ if (UsesLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::MTLR)).addReg(PPC::R0);
}
}