#include "PPCInstrBuilder.h"
#include "PPCInstrInfo.h"
#include "PPCMachineFunctionInfo.h"
+#include "PPCSubtarget.h"
+#include "PPCTargetMachine.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31
};
+static unsigned computeReturnSaveOffset(const PPCSubtarget &STI) {
+ if (STI.isDarwinABI())
+ return STI.isPPC64() ? 16 : 8;
+ // SVR4 ABI:
+ return STI.isPPC64() ? 16 : 4;
+}
+
+static unsigned computeTOCSaveOffset(const PPCSubtarget &STI) {
+ return STI.isELFv2ABI() ? 24 : 40;
+}
+
+static unsigned computeFramePointerSaveOffset(const PPCSubtarget &STI) {
+ // For the Darwin ABI:
+ // We cannot use the TOC save slot (offset +20) in the PowerPC linkage area
+ // for saving the frame pointer (if needed.) While the published ABI has
+ // not used this slot since at least MacOSX 10.2, there is older code
+ // around that does use it, and that needs to continue to work.
+ if (STI.isDarwinABI())
+ return STI.isPPC64() ? -8U : -4U;
+
+ // SVR4 ABI: First slot in the general register save area.
+ return STI.isPPC64() ? -8U : -4U;
+}
+
+static unsigned computeLinkageSize(const PPCSubtarget &STI) {
+ if (STI.isDarwinABI() || STI.isPPC64())
+ return (STI.isELFv2ABI() ? 4 : 6) * (STI.isPPC64() ? 8 : 4);
+
+ // SVR4 ABI:
+ return 8;
+}
+
+static unsigned computeBasePointerSaveOffset(const PPCSubtarget &STI) {
+ if (STI.isDarwinABI())
+ return STI.isPPC64() ? -16U : -8U;
+
+ // SVR4 ABI: First slot in the general register save area.
+ return STI.isPPC64()
+ ? -16U
+ : (STI.getTargetMachine().getRelocationModel() == Reloc::PIC_)
+ ? -12U
+ : -8U;
+}
+
+PPCFrameLowering::PPCFrameLowering(const PPCSubtarget &STI)
+ : TargetFrameLowering(TargetFrameLowering::StackGrowsDown,
+ STI.getPlatformStackAlignment(), 0),
+ Subtarget(STI), ReturnSaveOffset(computeReturnSaveOffset(Subtarget)),
+ TOCSaveOffset(computeTOCSaveOffset(Subtarget)),
+ FramePointerSaveOffset(computeFramePointerSaveOffset(Subtarget)),
+ LinkageSize(computeLinkageSize(Subtarget)),
+ BasePointerSaveOffset(computeBasePointerSaveOffset(STI)) {}
+
+// With the SVR4 ABI, callee-saved registers have fixed offsets on the stack.
+const PPCFrameLowering::SpillSlot *PPCFrameLowering::getCalleeSavedSpillSlots(
+ unsigned &NumEntries) const {
+ if (Subtarget.isDarwinABI()) {
+ NumEntries = 1;
+ if (Subtarget.isPPC64()) {
+ static const SpillSlot darwin64Offsets = {PPC::X31, -8};
+ return &darwin64Offsets;
+ } else {
+ static const SpillSlot darwinOffsets = {PPC::R31, -4};
+ return &darwinOffsets;
+ }
+ }
+
+ // Early exit if not using the SVR4 ABI.
+ if (!Subtarget.isSVR4ABI()) {
+ NumEntries = 0;
+ return nullptr;
+ }
+
+ // Note that the offsets here overlap, but this is fixed up in
+ // processFunctionBeforeFrameFinalized.
+
+ static const SpillSlot Offsets[] = {
+ // Floating-point register save area offsets.
+ {PPC::F31, -8},
+ {PPC::F30, -16},
+ {PPC::F29, -24},
+ {PPC::F28, -32},
+ {PPC::F27, -40},
+ {PPC::F26, -48},
+ {PPC::F25, -56},
+ {PPC::F24, -64},
+ {PPC::F23, -72},
+ {PPC::F22, -80},
+ {PPC::F21, -88},
+ {PPC::F20, -96},
+ {PPC::F19, -104},
+ {PPC::F18, -112},
+ {PPC::F17, -120},
+ {PPC::F16, -128},
+ {PPC::F15, -136},
+ {PPC::F14, -144},
+
+ // General register save area offsets.
+ {PPC::R31, -4},
+ {PPC::R30, -8},
+ {PPC::R29, -12},
+ {PPC::R28, -16},
+ {PPC::R27, -20},
+ {PPC::R26, -24},
+ {PPC::R25, -28},
+ {PPC::R24, -32},
+ {PPC::R23, -36},
+ {PPC::R22, -40},
+ {PPC::R21, -44},
+ {PPC::R20, -48},
+ {PPC::R19, -52},
+ {PPC::R18, -56},
+ {PPC::R17, -60},
+ {PPC::R16, -64},
+ {PPC::R15, -68},
+ {PPC::R14, -72},
+
+ // CR save area offset. We map each of the nonvolatile CR fields
+ // to the slot for CR2, which is the first of the nonvolatile CR
+ // fields to be assigned, so that we only allocate one save slot.
+ // See PPCRegisterInfo::hasReservedSpillSlot() for more information.
+ {PPC::CR2, -4},
+
+ // VRSAVE save area offset.
+ {PPC::VRSAVE, -4},
+
+ // Vector register save area
+ {PPC::V31, -16},
+ {PPC::V30, -32},
+ {PPC::V29, -48},
+ {PPC::V28, -64},
+ {PPC::V27, -80},
+ {PPC::V26, -96},
+ {PPC::V25, -112},
+ {PPC::V24, -128},
+ {PPC::V23, -144},
+ {PPC::V22, -160},
+ {PPC::V21, -176},
+ {PPC::V20, -192}};
+
+ static const SpillSlot Offsets64[] = {
+ // Floating-point register save area offsets.
+ {PPC::F31, -8},
+ {PPC::F30, -16},
+ {PPC::F29, -24},
+ {PPC::F28, -32},
+ {PPC::F27, -40},
+ {PPC::F26, -48},
+ {PPC::F25, -56},
+ {PPC::F24, -64},
+ {PPC::F23, -72},
+ {PPC::F22, -80},
+ {PPC::F21, -88},
+ {PPC::F20, -96},
+ {PPC::F19, -104},
+ {PPC::F18, -112},
+ {PPC::F17, -120},
+ {PPC::F16, -128},
+ {PPC::F15, -136},
+ {PPC::F14, -144},
+
+ // General register save area offsets.
+ {PPC::X31, -8},
+ {PPC::X30, -16},
+ {PPC::X29, -24},
+ {PPC::X28, -32},
+ {PPC::X27, -40},
+ {PPC::X26, -48},
+ {PPC::X25, -56},
+ {PPC::X24, -64},
+ {PPC::X23, -72},
+ {PPC::X22, -80},
+ {PPC::X21, -88},
+ {PPC::X20, -96},
+ {PPC::X19, -104},
+ {PPC::X18, -112},
+ {PPC::X17, -120},
+ {PPC::X16, -128},
+ {PPC::X15, -136},
+ {PPC::X14, -144},
+
+ // VRSAVE save area offset.
+ {PPC::VRSAVE, -4},
+
+ // Vector register save area
+ {PPC::V31, -16},
+ {PPC::V30, -32},
+ {PPC::V29, -48},
+ {PPC::V28, -64},
+ {PPC::V27, -80},
+ {PPC::V26, -96},
+ {PPC::V25, -112},
+ {PPC::V24, -128},
+ {PPC::V23, -144},
+ {PPC::V22, -160},
+ {PPC::V21, -176},
+ {PPC::V20, -192}};
+
+ if (Subtarget.isPPC64()) {
+ NumEntries = array_lengthof(Offsets64);
+
+ return Offsets64;
+ } else {
+ NumEntries = array_lengthof(Offsets);
+
+ return Offsets;
+ }
+}
+
/// RemoveVRSaveCode - We have found that this function does not need any code
/// to manipulate the VRSAVE register, even though it uses vector registers.
/// This can happen when the only registers used are known to be live in or out
// transform this into the appropriate ORI instruction.
static void HandleVRSaveUpdate(MachineInstr *MI, const TargetInstrInfo &TII) {
MachineFunction *MF = MI->getParent()->getParent();
- const TargetRegisterInfo *TRI = MF->getTarget().getRegisterInfo();
+ const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
DebugLoc dl = MI->getDebugLoc();
+ const MachineRegisterInfo &MRI = MF->getRegInfo();
unsigned UsedRegMask = 0;
for (unsigned i = 0; i != 32; ++i)
- if (MF->getRegInfo().isPhysRegUsed(VRRegNo[i]))
+ if (MRI.isPhysRegModified(VRRegNo[i]))
UsedRegMask |= 1 << (31-i);
// Live in and live out values already must be in the mask, so don't bother
return FuncInfo->hasNonRISpills();
}
+/// MustSaveLR - Return true if this function requires that we save the LR
+/// register onto the stack in the prolog and restore it in the epilog of the
+/// function.
+static bool MustSaveLR(const MachineFunction &MF, unsigned LR) {
+ const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>();
+
+ // We need a save/restore of LR if there is any def of LR (which is
+ // defined by calls, including the PIC setup sequence), or if there is
+ // some use of the LR stack slot (e.g. for builtin_return_address).
+ // (LR comes in 32 and 64 bit versions.)
+ MachineRegisterInfo::def_iterator RI = MF.getRegInfo().def_begin(LR);
+ return RI !=MF.getRegInfo().def_end() || MFI->isLRStoreRequired();
+}
+
/// determineFrameLayout - Determine the size of the frame and maximum call
/// frame size.
unsigned PPCFrameLowering::determineFrameLayout(MachineFunction &MF,
unsigned AlignMask = std::max(MaxAlign, TargetAlign) - 1;
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo*>(MF.getTarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
// If we are a leaf function, and use up to 224 bytes of stack space,
// don't have a frame pointer, calls, or dynamic alloca then we do not need
// to adjust the stack pointer (we fit in the Red Zone).
// The 32-bit SVR4 ABI has no Red Zone. However, it can still generate
// stackless code if all local vars are reg-allocated.
- bool DisableRedZone = MF.getFunction()->getAttributes().
- hasAttribute(AttributeSet::FunctionIndex, Attribute::NoRedZone);
+ bool DisableRedZone = MF.getFunction()->hasFnAttribute(Attribute::NoRedZone);
+ unsigned LR = RegInfo->getRARegister();
if (!DisableRedZone &&
(Subtarget.isPPC64() || // 32-bit SVR4, no stack-
!Subtarget.isSVR4ABI() || // allocated locals.
FrameSize <= 224 && // Fits in red zone.
!MFI->hasVarSizedObjects() && // No dynamic alloca.
!MFI->adjustsStack() && // No calls.
+ !MustSaveLR(MF, LR) &&
!RegInfo->hasBasePointer(MF)) { // No special alignment.
// No need for frame
if (UpdateMF)
// Get the maximum call frame size of all the calls.
unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
- // Maximum call frame needs to be at least big enough for linkage and 8 args.
- unsigned minCallFrameSize = getMinCallFrameSize(Subtarget.isPPC64(),
- Subtarget.isDarwinABI());
+ // Maximum call frame needs to be at least big enough for linkage area.
+ unsigned minCallFrameSize = getLinkageSize();
maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
// If we have dynamic alloca then maxCallFrameSize needs to be aligned so
// Naked functions have no stack frame pushed, so we don't have a frame
// pointer.
- if (MF.getFunction()->getAttributes().hasAttribute(
- AttributeSet::FunctionIndex, Attribute::Naked))
+ if (MF.getFunction()->hasFnAttribute(Attribute::Naked))
return false;
return MF.getTarget().Options.DisableFramePointerElim(MF) ||
MFI->hasVarSizedObjects() ||
+ MFI->hasStackMap() || MFI->hasPatchPoint() ||
(MF.getTarget().Options.GuaranteedTailCallOpt &&
MF.getInfo<PPCFunctionInfo>()->hasFastCall());
}
unsigned FP8Reg = is31 ? PPC::X31 : PPC::X1;
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo*>(MF.getTarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
bool HasBP = RegInfo->hasBasePointer(MF);
- unsigned BPReg = HasBP ? (unsigned) PPC::R30 : FPReg;
+ unsigned BPReg = HasBP ? (unsigned) RegInfo->getBaseRegister(MF) : FPReg;
unsigned BP8Reg = HasBP ? (unsigned) PPC::X30 : FPReg;
for (MachineFunction::iterator BI = MF.begin(), BE = MF.end();
}
}
-void PPCFrameLowering::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
+void PPCFrameLowering::emitPrologue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo*>(MF.getTarget().getInstrInfo());
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo*>(MF.getTarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
MachineModuleInfo &MMI = MF.getMMI();
const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
DebugLoc dl;
- bool needsFrameMoves = MMI.hasDebugInfo() ||
+ bool needsCFI = MMI.hasDebugInfo() ||
MF.getFunction()->needsUnwindTableEntry();
// Get processor type.
bool isPPC64 = Subtarget.isPPC64();
// Get the ABI.
- bool isDarwinABI = Subtarget.isDarwinABI();
bool isSVR4ABI = Subtarget.isSVR4ABI();
- assert((isDarwinABI || isSVR4ABI) &&
+ bool isELFv2ABI = Subtarget.isELFv2ABI();
+ assert((Subtarget.isDarwinABI() || isSVR4ABI) &&
"Currently only Darwin and SVR4 ABIs are supported for PowerPC.");
// Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
}
}
- // Move MBBI back to the beginning of the function.
+ // Move MBBI back to the beginning of the prologue block.
MBBI = MBB.begin();
// Work out frame sizes.
bool HasBP = RegInfo->hasBasePointer(MF);
unsigned SPReg = isPPC64 ? PPC::X1 : PPC::R1;
- unsigned BPReg = isPPC64 ? PPC::X30 : PPC::R30;
+ unsigned BPReg = RegInfo->getBaseRegister(MF);
unsigned FPReg = isPPC64 ? PPC::X31 : PPC::R31;
unsigned LRReg = isPPC64 ? PPC::LR8 : PPC::LR;
unsigned ScratchReg = isPPC64 ? PPC::X0 : PPC::R0;
assert((isPPC64 || !isSVR4ABI || !(!FrameSize && (MustSaveLR || HasFP))) &&
"FrameSize must be >0 to save/restore the FP or LR for 32-bit SVR4.");
- int LROffset = PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI);
+ int LROffset = getReturnSaveOffset();
int FPOffset = 0;
if (HasFP) {
assert(FPIndex && "No Frame Pointer Save Slot!");
FPOffset = FFI->getObjectOffset(FPIndex);
} else {
- FPOffset =
- PPCFrameLowering::getFramePointerSaveOffset(isPPC64, isDarwinABI);
+ FPOffset = getFramePointerSaveOffset();
}
}
assert(BPIndex && "No Base Pointer Save Slot!");
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
- BPOffset =
- PPCFrameLowering::getBasePointerSaveOffset(isPPC64, isDarwinABI);
+ BPOffset = getBasePointerSaveOffset();
}
}
+ int PBPOffset = 0;
+ if (FI->usesPICBase()) {
+ MachineFrameInfo *FFI = MF.getFrameInfo();
+ int PBPIndex = FI->getPICBasePointerSaveIndex();
+ assert(PBPIndex && "No PIC Base Pointer Save Slot!");
+ PBPOffset = FFI->getObjectOffset(PBPIndex);
+ }
+
// Get stack alignments.
unsigned MaxAlign = MFI->getMaxAlignment();
if (HasBP && MaxAlign > 1)
"Prologue CR saving supported only in 64-bit mode");
if (!MustSaveCRs.empty()) { // will only occur for PPC64
+ // FIXME: In the ELFv2 ABI, we are not required to save all CR fields.
+ // If only one or two CR fields are clobbered, it could be more
+ // efficient to use mfocrf to selectively save just those fields.
MachineInstrBuilder MIB =
BuildMI(MBB, MBBI, dl, TII.get(PPC::MFCR8), TempReg);
for (unsigned i = 0, e = MustSaveCRs.size(); i != e; ++i)
.addImm(FPOffset)
.addReg(SPReg);
+ if (FI->usesPICBase())
+ // FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
+ BuildMI(MBB, MBBI, dl, StoreInst)
+ .addReg(PPC::R30)
+ .addImm(PBPOffset)
+ .addReg(SPReg);
+
if (HasBP)
// FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
BuildMI(MBB, MBBI, dl, StoreInst)
.addReg(ScratchReg);
}
- // Add the "machine moves" for the instructions we generated above, but in
- // reverse order.
- if (needsFrameMoves) {
- // Show update of SP.
- assert(NegFrameSize);
- unsigned CFIIndex = MMI.addFrameInst(
- MCCFIInstruction::createDefCfaOffset(nullptr, NegFrameSize));
+ // Add Call Frame Information for the instructions we generated above.
+ if (needsCFI) {
+ unsigned CFIIndex;
+
+ if (HasBP) {
+ // Define CFA in terms of BP. Do this in preference to using FP/SP,
+ // because if the stack needed aligning then CFA won't be at a fixed
+ // offset from FP/SP.
+ unsigned Reg = MRI->getDwarfRegNum(BPReg, true);
+ CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaRegister(nullptr, Reg));
+ } else {
+ // Adjust the definition of CFA to account for the change in SP.
+ assert(NegFrameSize);
+ CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, NegFrameSize));
+ }
BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
if (HasFP) {
+ // Describe where FP was saved, at a fixed offset from CFA.
unsigned Reg = MRI->getDwarfRegNum(FPReg, true);
CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, Reg, FPOffset));
.addCFIIndex(CFIIndex);
}
+ if (FI->usesPICBase()) {
+ // Describe where FP was saved, at a fixed offset from CFA.
+ unsigned Reg = MRI->getDwarfRegNum(PPC::R30, true);
+ CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createOffset(nullptr, Reg, PBPOffset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
+
if (HasBP) {
+ // Describe where BP was saved, at a fixed offset from CFA.
unsigned Reg = MRI->getDwarfRegNum(BPReg, true);
CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, Reg, BPOffset));
}
if (MustSaveLR) {
+ // Describe where LR was saved, at a fixed offset from CFA.
unsigned Reg = MRI->getDwarfRegNum(LRReg, true);
CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createOffset(nullptr, Reg, LROffset));
.addReg(SPReg)
.addReg(SPReg);
- if (needsFrameMoves) {
- // Mark effective beginning of when frame pointer is ready.
+ if (!HasBP && needsCFI) {
+ // Change the definition of CFA from SP+offset to FP+offset, because SP
+ // will change at every alloca.
unsigned Reg = MRI->getDwarfRegNum(FPReg, true);
unsigned CFIIndex = MMI.addFrameInst(
MCCFIInstruction::createDefCfaRegister(nullptr, Reg));
}
}
- if (needsFrameMoves) {
- // Add callee saved registers to move list.
+ if (needsCFI) {
+ // Describe where callee saved registers were saved, at fixed offsets from
+ // CFA.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
unsigned Reg = CSI[I].getReg();
// For 64-bit SVR4 when we have spilled CRs, the spill location
// is SP+8, not a frame-relative slot.
if (isSVR4ABI && isPPC64 && (PPC::CR2 <= Reg && Reg <= PPC::CR4)) {
+ // In the ELFv1 ABI, only CR2 is noted in CFI and stands in for
+ // the whole CR word. In the ELFv2 ABI, every CR that was
+ // actually saved gets its own CFI record.
+ unsigned CRReg = isELFv2ABI? Reg : (unsigned) PPC::CR2;
unsigned CFIIndex = MMI.addFrameInst(MCCFIInstruction::createOffset(
- nullptr, MRI->getDwarfRegNum(PPC::CR2, true), 8));
+ nullptr, MRI->getDwarfRegNum(CRReg, true), 8));
BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
.addCFIIndex(CFIIndex);
continue;
}
void PPCFrameLowering::emitEpilogue(MachineFunction &MF,
- MachineBasicBlock &MBB) const {
- MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
- assert(MBBI != MBB.end() && "Returning block has no terminator");
- const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo*>(MF.getTarget().getInstrInfo());
- const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo*>(MF.getTarget().getRegisterInfo());
-
- unsigned RetOpcode = MBBI->getOpcode();
+ MachineBasicBlock &MBB) const {
+ MachineBasicBlock::iterator MBBI = MBB.getFirstTerminator();
DebugLoc dl;
- assert((RetOpcode == PPC::BLR ||
- RetOpcode == PPC::TCRETURNri ||
- RetOpcode == PPC::TCRETURNdi ||
- RetOpcode == PPC::TCRETURNai ||
- RetOpcode == PPC::TCRETURNri8 ||
- RetOpcode == PPC::TCRETURNdi8 ||
- RetOpcode == PPC::TCRETURNai8) &&
- "Can only insert epilog into returning blocks");
+ if (MBBI != MBB.end())
+ dl = MBBI->getDebugLoc();
+
+ const PPCInstrInfo &TII =
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
+ const PPCRegisterInfo *RegInfo =
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
// Get alignment info so we know how to restore the SP.
const MachineFrameInfo *MFI = MF.getFrameInfo();
// Get processor type.
bool isPPC64 = Subtarget.isPPC64();
// Get the ABI.
- bool isDarwinABI = Subtarget.isDarwinABI();
bool isSVR4ABI = Subtarget.isSVR4ABI();
// Check if the link register (LR) has been saved.
bool HasBP = RegInfo->hasBasePointer(MF);
unsigned SPReg = isPPC64 ? PPC::X1 : PPC::R1;
- unsigned BPReg = isPPC64 ? PPC::X30 : PPC::R30;
+ unsigned BPReg = RegInfo->getBaseRegister(MF);
unsigned FPReg = isPPC64 ? PPC::X31 : PPC::R31;
unsigned ScratchReg = isPPC64 ? PPC::X0 : PPC::R0;
unsigned TempReg = isPPC64 ? PPC::X12 : PPC::R12; // another scratch reg
const MCInstrDesc& AddInst = TII.get( isPPC64 ? PPC::ADD8
: PPC::ADD4 );
- int LROffset = PPCFrameLowering::getReturnSaveOffset(isPPC64, isDarwinABI);
+ int LROffset = getReturnSaveOffset();
int FPOffset = 0;
if (HasFP) {
assert(FPIndex && "No Frame Pointer Save Slot!");
FPOffset = FFI->getObjectOffset(FPIndex);
} else {
- FPOffset =
- PPCFrameLowering::getFramePointerSaveOffset(isPPC64, isDarwinABI);
+ FPOffset = getFramePointerSaveOffset();
}
}
assert(BPIndex && "No Base Pointer Save Slot!");
BPOffset = FFI->getObjectOffset(BPIndex);
} else {
- BPOffset =
- PPCFrameLowering::getBasePointerSaveOffset(isPPC64, isDarwinABI);
+ BPOffset = getBasePointerSaveOffset();
}
}
- bool UsesTCRet = RetOpcode == PPC::TCRETURNri ||
- RetOpcode == PPC::TCRETURNdi ||
- RetOpcode == PPC::TCRETURNai ||
- RetOpcode == PPC::TCRETURNri8 ||
- RetOpcode == PPC::TCRETURNdi8 ||
- RetOpcode == PPC::TCRETURNai8;
-
- if (UsesTCRet) {
- int MaxTCRetDelta = FI->getTailCallSPDelta();
- MachineOperand &StackAdjust = MBBI->getOperand(1);
- assert(StackAdjust.isImm() && "Expecting immediate value.");
- // Adjust stack pointer.
- int StackAdj = StackAdjust.getImm();
- int Delta = StackAdj - MaxTCRetDelta;
- assert((Delta >= 0) && "Delta must be positive");
- if (MaxTCRetDelta>0)
- FrameSize += (StackAdj +Delta);
- else
- FrameSize += StackAdj;
+ int PBPOffset = 0;
+ if (FI->usesPICBase()) {
+ MachineFrameInfo *FFI = MF.getFrameInfo();
+ int PBPIndex = FI->getPICBasePointerSaveIndex();
+ assert(PBPIndex && "No PIC Base Pointer Save Slot!");
+ PBPOffset = FFI->getObjectOffset(PBPIndex);
+ }
+
+ bool IsReturnBlock = MBBI->isReturn();
+
+ if (IsReturnBlock) {
+ unsigned RetOpcode = MBBI->getOpcode();
+ bool UsesTCRet = RetOpcode == PPC::TCRETURNri ||
+ RetOpcode == PPC::TCRETURNdi ||
+ RetOpcode == PPC::TCRETURNai ||
+ RetOpcode == PPC::TCRETURNri8 ||
+ RetOpcode == PPC::TCRETURNdi8 ||
+ RetOpcode == PPC::TCRETURNai8;
+
+ if (UsesTCRet) {
+ int MaxTCRetDelta = FI->getTailCallSPDelta();
+ MachineOperand &StackAdjust = MBBI->getOperand(1);
+ assert(StackAdjust.isImm() && "Expecting immediate value.");
+ // Adjust stack pointer.
+ int StackAdj = StackAdjust.getImm();
+ int Delta = StackAdj - MaxTCRetDelta;
+ assert((Delta >= 0) && "Delta must be positive");
+ if (MaxTCRetDelta>0)
+ FrameSize += (StackAdj +Delta);
+ else
+ FrameSize += StackAdj;
+ }
}
// Frames of 32KB & larger require special handling because they cannot be
.addImm(FPOffset)
.addReg(SPReg);
+ if (FI->usesPICBase())
+ // FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
+ BuildMI(MBB, MBBI, dl, LoadInst)
+ .addReg(PPC::R30)
+ .addImm(PBPOffset)
+ .addReg(SPReg);
+
if (HasBP)
BuildMI(MBB, MBBI, dl, LoadInst, BPReg)
.addImm(BPOffset)
// Callee pop calling convention. Pop parameter/linkage area. Used for tail
// call optimization
- if (MF.getTarget().Options.GuaranteedTailCallOpt && RetOpcode == PPC::BLR &&
- MF.getFunction()->getCallingConv() == CallingConv::Fast) {
- PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
- unsigned CallerAllocatedAmt = FI->getMinReservedArea();
-
- if (CallerAllocatedAmt && isInt<16>(CallerAllocatedAmt)) {
- BuildMI(MBB, MBBI, dl, AddImmInst, SPReg)
- .addReg(SPReg).addImm(CallerAllocatedAmt);
- } else {
- BuildMI(MBB, MBBI, dl, LoadImmShiftedInst, ScratchReg)
+ if (IsReturnBlock) {
+ unsigned RetOpcode = MBBI->getOpcode();
+ if (MF.getTarget().Options.GuaranteedTailCallOpt &&
+ (RetOpcode == PPC::BLR || RetOpcode == PPC::BLR8) &&
+ MF.getFunction()->getCallingConv() == CallingConv::Fast) {
+ PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
+ unsigned CallerAllocatedAmt = FI->getMinReservedArea();
+
+ if (CallerAllocatedAmt && isInt<16>(CallerAllocatedAmt)) {
+ BuildMI(MBB, MBBI, dl, AddImmInst, SPReg)
+ .addReg(SPReg).addImm(CallerAllocatedAmt);
+ } else {
+ BuildMI(MBB, MBBI, dl, LoadImmShiftedInst, ScratchReg)
.addImm(CallerAllocatedAmt >> 16);
- BuildMI(MBB, MBBI, dl, OrImmInst, ScratchReg)
+ BuildMI(MBB, MBBI, dl, OrImmInst, ScratchReg)
.addReg(ScratchReg, RegState::Kill)
.addImm(CallerAllocatedAmt & 0xFFFF);
- BuildMI(MBB, MBBI, dl, AddInst)
+ BuildMI(MBB, MBBI, dl, AddInst)
.addReg(SPReg)
.addReg(FPReg)
.addReg(ScratchReg);
- }
- } else if (RetOpcode == PPC::TCRETURNdi) {
- MBBI = MBB.getLastNonDebugInstr();
- MachineOperand &JumpTarget = MBBI->getOperand(0);
- BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILB)).
- addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
- } else if (RetOpcode == PPC::TCRETURNri) {
- MBBI = MBB.getLastNonDebugInstr();
- assert(MBBI->getOperand(0).isReg() && "Expecting register operand.");
- BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBCTR));
- } else if (RetOpcode == PPC::TCRETURNai) {
- MBBI = MBB.getLastNonDebugInstr();
- MachineOperand &JumpTarget = MBBI->getOperand(0);
- BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBA)).addImm(JumpTarget.getImm());
- } else if (RetOpcode == PPC::TCRETURNdi8) {
- MBBI = MBB.getLastNonDebugInstr();
- MachineOperand &JumpTarget = MBBI->getOperand(0);
- BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILB8)).
- addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
- } else if (RetOpcode == PPC::TCRETURNri8) {
- MBBI = MBB.getLastNonDebugInstr();
- assert(MBBI->getOperand(0).isReg() && "Expecting register operand.");
- BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBCTR8));
- } else if (RetOpcode == PPC::TCRETURNai8) {
- MBBI = MBB.getLastNonDebugInstr();
- MachineOperand &JumpTarget = MBBI->getOperand(0);
- BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBA8)).addImm(JumpTarget.getImm());
+ }
+ } else if (RetOpcode == PPC::TCRETURNdi) {
+ MBBI = MBB.getLastNonDebugInstr();
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILB)).
+ addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
+ } else if (RetOpcode == PPC::TCRETURNri) {
+ MBBI = MBB.getLastNonDebugInstr();
+ assert(MBBI->getOperand(0).isReg() && "Expecting register operand.");
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBCTR));
+ } else if (RetOpcode == PPC::TCRETURNai) {
+ MBBI = MBB.getLastNonDebugInstr();
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBA)).addImm(JumpTarget.getImm());
+ } else if (RetOpcode == PPC::TCRETURNdi8) {
+ MBBI = MBB.getLastNonDebugInstr();
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILB8)).
+ addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
+ } else if (RetOpcode == PPC::TCRETURNri8) {
+ MBBI = MBB.getLastNonDebugInstr();
+ assert(MBBI->getOperand(0).isReg() && "Expecting register operand.");
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBCTR8));
+ } else if (RetOpcode == PPC::TCRETURNai8) {
+ MBBI = MBB.getLastNonDebugInstr();
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBA8)).addImm(JumpTarget.getImm());
+ }
}
}
-/// MustSaveLR - Return true if this function requires that we save the LR
-/// register onto the stack in the prolog and restore it in the epilog of the
-/// function.
-static bool MustSaveLR(const MachineFunction &MF, unsigned LR) {
- const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>();
-
- // We need a save/restore of LR if there is any def of LR (which is
- // defined by calls, including the PIC setup sequence), or if there is
- // some use of the LR stack slot (e.g. for builtin_return_address).
- // (LR comes in 32 and 64 bit versions.)
- MachineRegisterInfo::def_iterator RI = MF.getRegInfo().def_begin(LR);
- return RI !=MF.getRegInfo().def_end() || MFI->isLRStoreRequired();
-}
+void PPCFrameLowering::determineCalleeSaves(MachineFunction &MF,
+ BitVector &SavedRegs,
+ RegScavenger *RS) const {
+ TargetFrameLowering::determineCalleeSaves(MF, SavedRegs, RS);
-void
-PPCFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
- RegScavenger *) const {
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo*>(MF.getTarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
// Save and clear the LR state.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
unsigned LR = RegInfo->getRARegister();
FI->setMustSaveLR(MustSaveLR(MF, LR));
- MachineRegisterInfo &MRI = MF.getRegInfo();
- MRI.setPhysRegUnused(LR);
+ SavedRegs.reset(LR);
// Save R31 if necessary
int FPSI = FI->getFramePointerSaveIndex();
// If the frame pointer save index hasn't been defined yet.
if (!FPSI && needsFP(MF)) {
// Find out what the fix offset of the frame pointer save area.
- int FPOffset = getFramePointerSaveOffset(isPPC64, isDarwinABI);
+ int FPOffset = getFramePointerSaveOffset();
// Allocate the frame index for frame pointer save area.
FPSI = MFI->CreateFixedObject(isPPC64? 8 : 4, FPOffset, true);
// Save the result.
int BPSI = FI->getBasePointerSaveIndex();
if (!BPSI && RegInfo->hasBasePointer(MF)) {
- int BPOffset = getBasePointerSaveOffset(isPPC64, isDarwinABI);
+ int BPOffset = getBasePointerSaveOffset();
// Allocate the frame index for the base pointer save area.
BPSI = MFI->CreateFixedObject(isPPC64? 8 : 4, BPOffset, true);
// Save the result.
FI->setBasePointerSaveIndex(BPSI);
}
+ // Reserve stack space for the PIC Base register (R30).
+ // Only used in SVR4 32-bit.
+ if (FI->usesPICBase()) {
+ int PBPSI = MFI->CreateFixedObject(4, -8, true);
+ FI->setPICBasePointerSaveIndex(PBPSI);
+ }
+
// Reserve stack space to move the linkage area to in case of a tail call.
int TCSPDelta = 0;
if (MF.getTarget().Options.GuaranteedTailCallOpt &&
// For 32-bit SVR4, allocate the nonvolatile CR spill slot iff the
// function uses CR 2, 3, or 4.
if (!isPPC64 && !isDarwinABI &&
- (MRI.isPhysRegUsed(PPC::CR2) ||
- MRI.isPhysRegUsed(PPC::CR3) ||
- MRI.isPhysRegUsed(PPC::CR4))) {
+ (SavedRegs.test(PPC::CR2) ||
+ SavedRegs.test(PPC::CR3) ||
+ SavedRegs.test(PPC::CR4))) {
int FrameIdx = MFI->CreateFixedObject((uint64_t)4, (int64_t)-4, true);
FI->setCRSpillFrameIndex(FrameIdx);
}
}
PPCFunctionInfo *PFI = MF.getInfo<PPCFunctionInfo>();
- const TargetRegisterInfo *TRI = MF.getTarget().getRegisterInfo();
+ const TargetRegisterInfo *TRI = Subtarget.getRegisterInfo();
int64_t LowerBound = 0;
FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
}
+ if (PFI->usesPICBase()) {
+ HasGPSaveArea = true;
+
+ int FI = PFI->getPICBasePointerSaveIndex();
+ assert(FI && "No PIC Base Pointer Save Slot!");
+
+ FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
+ }
+
const PPCRegisterInfo *RegInfo =
- static_cast<const PPCRegisterInfo*>(MF.getTarget().getRegisterInfo());
+ static_cast<const PPCRegisterInfo *>(Subtarget.getRegisterInfo());
if (RegInfo->hasBasePointer(MF)) {
HasGPSaveArea = true;
MachineFunction *MF = MBB.getParent();
const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo*>(MF->getTarget().getInstrInfo());
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
DebugLoc DL;
bool CRSpilled = false;
MachineInstrBuilder CRMIB;
const std::vector<CalleeSavedInfo> &CSI, unsigned CSIIndex) {
MachineFunction *MF = MBB.getParent();
- const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo*>(MF->getTarget().getInstrInfo());
+ const PPCInstrInfo &TII = *MF->getSubtarget<PPCSubtarget>().getInstrInfo();
DebugLoc DL;
unsigned RestoreOp, MoveReg;
void PPCFrameLowering::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
- const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo*>(MF.getTarget().getInstrInfo());
+ const TargetInstrInfo &TII = *Subtarget.getInstrInfo();
if (MF.getTarget().Options.GuaranteedTailCallOpt &&
I->getOpcode() == PPC::ADJCALLSTACKUP) {
// Add (actually subtract) back the amount the callee popped on return.
MachineFunction *MF = MBB.getParent();
const PPCInstrInfo &TII =
- *static_cast<const PPCInstrInfo*>(MF->getTarget().getInstrInfo());
+ *static_cast<const PPCInstrInfo *>(Subtarget.getInstrInfo());
bool CR2Spilled = false;
bool CR3Spilled = false;
bool CR4Spilled = false;
return true;
}
+
+bool PPCFrameLowering::enableShrinkWrapping(const MachineFunction &MF) const {
+ return (MF.getSubtarget<PPCSubtarget>().isSVR4ABI() &&
+ MF.getSubtarget<PPCSubtarget>().isPPC64());
+}
projects / oota-llvm.git / blobdiff