//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
-// This file contains the PowerPC implementation of the MRegisterInfo class.
+// This file contains the PowerPC implementation of the TargetRegisterInfo
+// class.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "reginfo"
#include "PPC.h"
#include "PPCInstrBuilder.h"
+#include "PPCMachineFunctionInfo.h"
#include "PPCRegisterInfo.h"
+#include "PPCFrameInfo.h"
#include "PPCSubtarget.h"
+#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
+#include "llvm/Function.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/MachineDebugInfo.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineLocation.h"
-#include "llvm/CodeGen/SelectionDAGNodes.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/MathExtras.h"
+#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include <cstdlib>
-#include <iostream>
using namespace llvm;
+// FIXME This disables some code that aligns the stack to a boundary
+// bigger than the default (16 bytes on Darwin) when there is a stack local
+// of greater alignment. This does not currently work, because the delta
+// between old and new stack pointers is added to offsets that reference
+// incoming parameters after the prolog is generated, and the code that
+// does that doesn't handle a variable delta. You don't want to do that
+// anyway; a better approach is to reserve another register that retains
+// to the incoming stack pointer, and reference parameters relative to that.
+#define ALIGN_STACK 0
+
+// FIXME (64-bit): Eventually enable by default.
+cl::opt<bool> EnablePPC32RS("enable-ppc32-regscavenger",
+ cl::init(false),
+ cl::desc("Enable PPC32 register scavenger"),
+ cl::Hidden);
+cl::opt<bool> EnablePPC64RS("enable-ppc64-regscavenger",
+ cl::init(false),
+ cl::desc("Enable PPC64 register scavenger"),
+ cl::Hidden);
+#define EnableRegisterScavenging \
+ ((EnablePPC32RS && !Subtarget.isPPC64()) || \
+ (EnablePPC64RS && Subtarget.isPPC64()))
+
+// FIXME (64-bit): Should be inlined.
+bool
+PPCRegisterInfo::requiresRegisterScavenging(const MachineFunction &) const {
+ return EnableRegisterScavenging;
+}
+
/// getRegisterNumbering - Given the enum value for some register, e.g.
/// PPC::F14, return the number that it corresponds to (e.g. 14).
unsigned PPCRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
using namespace PPC;
switch (RegEnum) {
- case R0 : case X0 : case F0 : case V0 : case CR0: return 0;
- case R1 : case X1 : case F1 : case V1 : case CR1: return 1;
- case R2 : case X2 : case F2 : case V2 : case CR2: return 2;
- case R3 : case X3 : case F3 : case V3 : case CR3: return 3;
- case R4 : case X4 : case F4 : case V4 : case CR4: return 4;
- case R5 : case X5 : case F5 : case V5 : case CR5: return 5;
- case R6 : case X6 : case F6 : case V6 : case CR6: return 6;
- case R7 : case X7 : case F7 : case V7 : case CR7: return 7;
- case R8 : case X8 : case F8 : case V8 : return 8;
- case R9 : case X9 : case F9 : case V9 : return 9;
- case R10: case X10: case F10: case V10: return 10;
- case R11: case X11: case F11: case V11: return 11;
- case R12: case X12: case F12: case V12: return 12;
- case R13: case X13: case F13: case V13: return 13;
- case R14: case X14: case F14: case V14: return 14;
- case R15: case X15: case F15: case V15: return 15;
- case R16: case X16: case F16: case V16: return 16;
- case R17: case X17: case F17: case V17: return 17;
- case R18: case X18: case F18: case V18: return 18;
- case R19: case X19: case F19: case V19: return 19;
- case R20: case X20: case F20: case V20: return 20;
- case R21: case X21: case F21: case V21: return 21;
- case R22: case X22: case F22: case V22: return 22;
- case R23: case X23: case F23: case V23: return 23;
- case R24: case X24: case F24: case V24: return 24;
- case R25: case X25: case F25: case V25: return 25;
- case R26: case X26: case F26: case V26: return 26;
- case R27: case X27: case F27: case V27: return 27;
- case R28: case X28: case F28: case V28: return 28;
- case R29: case X29: case F29: case V29: return 29;
- case R30: case X30: case F30: case V30: return 30;
- case R31: case X31: case F31: case V31: return 31;
+ case 0: return 0;
+ case R0 : case X0 : case F0 : case V0 : case CR0: case CR0LT: return 0;
+ case R1 : case X1 : case F1 : case V1 : case CR1: case CR0GT: return 1;
+ case R2 : case X2 : case F2 : case V2 : case CR2: case CR0EQ: return 2;
+ case R3 : case X3 : case F3 : case V3 : case CR3: case CR0UN: return 3;
+ case R4 : case X4 : case F4 : case V4 : case CR4: case CR1LT: return 4;
+ case R5 : case X5 : case F5 : case V5 : case CR5: case CR1GT: return 5;
+ case R6 : case X6 : case F6 : case V6 : case CR6: case CR1EQ: return 6;
+ case R7 : case X7 : case F7 : case V7 : case CR7: case CR1UN: return 7;
+ case R8 : case X8 : case F8 : case V8 : case CR2LT: return 8;
+ case R9 : case X9 : case F9 : case V9 : case CR2GT: return 9;
+ case R10: case X10: case F10: case V10: case CR2EQ: return 10;
+ case R11: case X11: case F11: case V11: case CR2UN: return 11;
+ case R12: case X12: case F12: case V12: case CR3LT: return 12;
+ case R13: case X13: case F13: case V13: case CR3GT: return 13;
+ case R14: case X14: case F14: case V14: case CR3EQ: return 14;
+ case R15: case X15: case F15: case V15: case CR3UN: return 15;
+ case R16: case X16: case F16: case V16: case CR4LT: return 16;
+ case R17: case X17: case F17: case V17: case CR4GT: return 17;
+ case R18: case X18: case F18: case V18: case CR4EQ: return 18;
+ case R19: case X19: case F19: case V19: case CR4UN: return 19;
+ case R20: case X20: case F20: case V20: case CR5LT: return 20;
+ case R21: case X21: case F21: case V21: case CR5GT: return 21;
+ case R22: case X22: case F22: case V22: case CR5EQ: return 22;
+ case R23: case X23: case F23: case V23: case CR5UN: return 23;
+ case R24: case X24: case F24: case V24: case CR6LT: return 24;
+ case R25: case X25: case F25: case V25: case CR6GT: return 25;
+ case R26: case X26: case F26: case V26: case CR6EQ: return 26;
+ case R27: case X27: case F27: case V27: case CR6UN: return 27;
+ case R28: case X28: case F28: case V28: case CR7LT: return 28;
+ case R29: case X29: case F29: case V29: case CR7GT: return 29;
+ case R30: case X30: case F30: case V30: case CR7EQ: return 30;
+ case R31: case X31: case F31: case V31: case CR7UN: return 31;
default:
- std::cerr << "Unhandled reg in PPCRegisterInfo::getRegisterNumbering!\n";
+ cerr << "Unhandled reg in PPCRegisterInfo::getRegisterNumbering!\n";
abort();
}
}
ImmToIdxMap[PPC::STH] = PPC::STHX; ImmToIdxMap[PPC::STW] = PPC::STWX;
ImmToIdxMap[PPC::STFS] = PPC::STFSX; ImmToIdxMap[PPC::STFD] = PPC::STFDX;
ImmToIdxMap[PPC::ADDI] = PPC::ADD4;
-}
-void
-PPCRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- unsigned SrcReg, int FrameIdx,
- const TargetRegisterClass *RC) const {
- if (RC == PPC::GPRCRegisterClass) {
- if (SrcReg != PPC::LR) {
- addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(SrcReg),FrameIdx);
- } else {
- // FIXME: this spills LR immediately to memory in one step. To do this,
- // we use R11, which we know cannot be used in the prolog/epilog. This is
- // a hack.
- BuildMI(MBB, MI, PPC::MFLR, 1, PPC::R11);
- addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(PPC::R11),
- FrameIdx);
- }
- } else if (RC == PPC::G8RCRegisterClass) {
- if (SrcReg != PPC::LR8) {
- addFrameReference(BuildMI(MBB, MI, PPC::STD, 3).addReg(SrcReg), FrameIdx);
- } else {
- // FIXME: this spills LR immediately to memory in one step. To do this,
- // we use R11, which we know cannot be used in the prolog/epilog. This is
- // a hack.
- BuildMI(MBB, MI, PPC::MFLR8, 1, PPC::X11);
- addFrameReference(BuildMI(MBB, MI, PPC::STD, 3).addReg(PPC::X11),
- FrameIdx);
- }
- } else if (RC == PPC::F8RCRegisterClass) {
- addFrameReference(BuildMI(MBB, MI, PPC::STFD, 3).addReg(SrcReg),FrameIdx);
- } else if (RC == PPC::F4RCRegisterClass) {
- addFrameReference(BuildMI(MBB, MI, PPC::STFS, 3).addReg(SrcReg),FrameIdx);
- } else if (RC == PPC::CRRCRegisterClass) {
- // FIXME: We use R0 here, because it isn't available for RA.
- // We need to store the CR in the low 4-bits of the saved value. First,
- // issue a MFCR to save all of the CRBits.
- BuildMI(MBB, MI, PPC::MFCR, 0, PPC::R0);
-
- // If the saved register wasn't CR0, shift the bits left so that they are in
- // CR0's slot.
- if (SrcReg != PPC::CR0) {
- unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4;
- // rlwinm r0, r0, ShiftBits, 0, 31.
- BuildMI(MBB, MI, PPC::RLWINM, 4, PPC::R0)
- .addReg(PPC::R0).addImm(ShiftBits).addImm(0).addImm(31);
- }
-
- addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(PPC::R0), FrameIdx);
- } else if (RC == PPC::VRRCRegisterClass) {
- // We don't have indexed addressing for vector loads. Emit:
- // R11 = ADDI FI#
- // Dest = LVX R0, R11
- //
- // FIXME: We use R0 here, because it isn't available for RA.
- addFrameReference(BuildMI(MBB, MI, PPC::ADDI, 1, PPC::R0), FrameIdx, 0, 0);
- BuildMI(MBB, MI, PPC::STVX, 3)
- .addReg(SrcReg).addReg(PPC::R0).addReg(PPC::R0);
- } else {
- assert(0 && "Unknown regclass!");
- abort();
- }
+ // 64-bit
+ ImmToIdxMap[PPC::LHA8] = PPC::LHAX8; ImmToIdxMap[PPC::LBZ8] = PPC::LBZX8;
+ ImmToIdxMap[PPC::LHZ8] = PPC::LHZX8; ImmToIdxMap[PPC::LWZ8] = PPC::LWZX8;
+ ImmToIdxMap[PPC::STB8] = PPC::STBX8; ImmToIdxMap[PPC::STH8] = PPC::STHX8;
+ ImmToIdxMap[PPC::STW8] = PPC::STWX8; ImmToIdxMap[PPC::STDU] = PPC::STDUX;
+ ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; ImmToIdxMap[PPC::STD_32] = PPC::STDX_32;
}
-void
-PPCRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- unsigned DestReg, int FrameIdx,
- const TargetRegisterClass *RC) const {
- if (RC == PPC::GPRCRegisterClass) {
- if (DestReg != PPC::LR) {
- addFrameReference(BuildMI(MBB, MI, PPC::LWZ, 2, DestReg), FrameIdx);
- } else {
- addFrameReference(BuildMI(MBB, MI, PPC::LWZ, 2, PPC::R11), FrameIdx);
- BuildMI(MBB, MI, PPC::MTLR, 1).addReg(PPC::R11);
- }
- } else if (RC == PPC::G8RCRegisterClass) {
- if (DestReg != PPC::LR8) {
- addFrameReference(BuildMI(MBB, MI, PPC::LD, 2, DestReg), FrameIdx);
- } else {
- addFrameReference(BuildMI(MBB, MI, PPC::LD, 2, PPC::R11), FrameIdx);
- BuildMI(MBB, MI, PPC::MTLR8, 1).addReg(PPC::R11);
- }
- } else if (RC == PPC::F8RCRegisterClass) {
- addFrameReference(BuildMI(MBB, MI, PPC::LFD, 2, DestReg), FrameIdx);
- } else if (RC == PPC::F4RCRegisterClass) {
- addFrameReference(BuildMI(MBB, MI, PPC::LFS, 2, DestReg), FrameIdx);
- } else if (RC == PPC::CRRCRegisterClass) {
- // FIXME: We use R0 here, because it isn't available for RA.
- addFrameReference(BuildMI(MBB, MI, PPC::LWZ, 2, PPC::R0), FrameIdx);
+const unsigned*
+PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
+ // 32-bit Darwin calling convention.
+ static const unsigned Macho32_CalleeSavedRegs[] = {
+ PPC::R13, PPC::R14, PPC::R15,
+ PPC::R16, PPC::R17, PPC::R18, PPC::R19,
+ PPC::R20, PPC::R21, PPC::R22, PPC::R23,
+ PPC::R24, PPC::R25, PPC::R26, PPC::R27,
+ PPC::R28, PPC::R29, PPC::R30, PPC::R31,
+
+ PPC::F14, PPC::F15, PPC::F16, PPC::F17,
+ PPC::F18, PPC::F19, PPC::F20, PPC::F21,
+ PPC::F22, PPC::F23, PPC::F24, PPC::F25,
+ PPC::F26, PPC::F27, PPC::F28, PPC::F29,
+ PPC::F30, PPC::F31,
- // If the reloaded register isn't CR0, shift the bits right so that they are
- // in the right CR's slot.
- if (DestReg != PPC::CR0) {
- unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
- // rlwinm r11, r11, 32-ShiftBits, 0, 31.
- BuildMI(MBB, MI, PPC::RLWINM, 4, PPC::R0)
- .addReg(PPC::R0).addImm(32-ShiftBits).addImm(0).addImm(31);
- }
+ PPC::CR2, PPC::CR3, PPC::CR4,
+ PPC::V20, PPC::V21, PPC::V22, PPC::V23,
+ PPC::V24, PPC::V25, PPC::V26, PPC::V27,
+ PPC::V28, PPC::V29, PPC::V30, PPC::V31,
- BuildMI(MBB, MI, PPC::MTCRF, 1, DestReg).addReg(PPC::R0);
- } else if (RC == PPC::VRRCRegisterClass) {
- // We don't have indexed addressing for vector loads. Emit:
- // R11 = ADDI FI#
- // Dest = LVX R0, R11
- //
- // FIXME: We use R0 here, because it isn't available for RA.
- addFrameReference(BuildMI(MBB, MI, PPC::ADDI, 1, PPC::R0), FrameIdx, 0, 0);
- BuildMI(MBB, MI, PPC::LVX, 2, DestReg).addReg(PPC::R0).addReg(PPC::R0);
- } else {
- assert(0 && "Unknown regclass!");
- abort();
- }
-}
-
-void PPCRegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator MI,
- unsigned DestReg, unsigned SrcReg,
- const TargetRegisterClass *RC) const {
- if (RC == PPC::GPRCRegisterClass) {
- BuildMI(MBB, MI, PPC::OR, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
- } else if (RC == PPC::G8RCRegisterClass) {
- BuildMI(MBB, MI, PPC::OR8, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
- } else if (RC == PPC::F4RCRegisterClass) {
- BuildMI(MBB, MI, PPC::FMRS, 1, DestReg).addReg(SrcReg);
- } else if (RC == PPC::F8RCRegisterClass) {
- BuildMI(MBB, MI, PPC::FMRD, 1, DestReg).addReg(SrcReg);
- } else if (RC == PPC::CRRCRegisterClass) {
- BuildMI(MBB, MI, PPC::MCRF, 1, DestReg).addReg(SrcReg);
- } else if (RC == PPC::VRRCRegisterClass) {
- BuildMI(MBB, MI, PPC::VOR, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
- } else {
- std::cerr << "Attempt to copy register that is not GPR or FPR";
- abort();
- }
-}
-
-const unsigned* PPCRegisterInfo::getCalleeSaveRegs() const {
- // 32-bit Darwin calling convention.
- static const unsigned Darwin32_CalleeSaveRegs[] = {
- PPC::R1 , PPC::R13, PPC::R14, PPC::R15,
+ PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
+ PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
+ PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
+
+ PPC::LR, 0
+ };
+
+ static const unsigned ELF32_CalleeSavedRegs[] = {
+ PPC::R13, PPC::R14, PPC::R15,
PPC::R16, PPC::R17, PPC::R18, PPC::R19,
PPC::R20, PPC::R21, PPC::R22, PPC::R23,
PPC::R24, PPC::R25, PPC::R26, PPC::R27,
PPC::R28, PPC::R29, PPC::R30, PPC::R31,
+ PPC::F9,
+ PPC::F10, PPC::F11, PPC::F12, PPC::F13,
PPC::F14, PPC::F15, PPC::F16, PPC::F17,
PPC::F18, PPC::F19, PPC::F20, PPC::F21,
PPC::F22, PPC::F23, PPC::F24, PPC::F25,
PPC::V24, PPC::V25, PPC::V26, PPC::V27,
PPC::V28, PPC::V29, PPC::V30, PPC::V31,
+ PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
+ PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
+ PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
+
PPC::LR, 0
};
// 64-bit Darwin calling convention.
- static const unsigned Darwin64_CalleeSaveRegs[] = {
- PPC::X1 , PPC::X13, PPC::X14, PPC::X15,
+ static const unsigned Macho64_CalleeSavedRegs[] = {
+ PPC::X14, PPC::X15,
PPC::X16, PPC::X17, PPC::X18, PPC::X19,
PPC::X20, PPC::X21, PPC::X22, PPC::X23,
PPC::X24, PPC::X25, PPC::X26, PPC::X27,
PPC::V24, PPC::V25, PPC::V26, PPC::V27,
PPC::V28, PPC::V29, PPC::V30, PPC::V31,
+ PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
+ PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
+ PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
+
PPC::LR8, 0
};
- return Subtarget.isPPC64() ? Darwin64_CalleeSaveRegs :
- Darwin32_CalleeSaveRegs;
+ if (Subtarget.isMachoABI())
+ return Subtarget.isPPC64() ? Macho64_CalleeSavedRegs :
+ Macho32_CalleeSavedRegs;
+
+ // ELF 32.
+ return ELF32_CalleeSavedRegs;
}
const TargetRegisterClass* const*
-PPCRegisterInfo::getCalleeSaveRegClasses() const {
- // 32-bit Darwin calling convention.
- static const TargetRegisterClass * const Darwin32_CalleeSaveRegClasses[] = {
+PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
+ // 32-bit Macho calling convention.
+ static const TargetRegisterClass * const Macho32_CalleeSavedRegClasses[] = {
+ &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
+
+ &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
+ &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
+ &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
+ &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
+ &PPC::F8RCRegClass,&PPC::F8RCRegClass,
+
+ &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
+
+ &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
+ &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
+ &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
+
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+
+ &PPC::GPRCRegClass, 0
+ };
+
+ static const TargetRegisterClass * const ELF32_CalleeSavedRegClasses[] = {
+ &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
+ &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
+ &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
+ &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
+ &PPC::F8RCRegClass,
+ &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+
&PPC::GPRCRegClass, 0
};
- // 64-bit Darwin calling convention.
- static const TargetRegisterClass * const Darwin64_CalleeSaveRegClasses[] = {
- &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
+ // 64-bit Macho calling convention.
+ static const TargetRegisterClass * const Macho64_CalleeSavedRegClasses[] = {
+ &PPC::G8RCRegClass,&PPC::G8RCRegClass,
&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
+ &PPC::CRBITRCRegClass,
+
&PPC::G8RCRegClass, 0
};
-
- return Subtarget.isPPC64() ? Darwin64_CalleeSaveRegClasses :
- Darwin32_CalleeSaveRegClasses;
+
+ if (Subtarget.isMachoABI())
+ return Subtarget.isPPC64() ? Macho64_CalleeSavedRegClasses :
+ Macho32_CalleeSavedRegClasses;
+
+ // ELF 32.
+ return ELF32_CalleeSavedRegClasses;
}
-/// foldMemoryOperand - PowerPC (like most RISC's) can only fold spills into
-/// copy instructions, turning them into load/store instructions.
-MachineInstr *PPCRegisterInfo::foldMemoryOperand(MachineInstr *MI,
- unsigned OpNum,
- int FrameIndex) const {
- // Make sure this is a reg-reg copy. Note that we can't handle MCRF, because
- // it takes more than one instruction to store it.
- unsigned Opc = MI->getOpcode();
-
- MachineInstr *NewMI = NULL;
- if ((Opc == PPC::OR &&
- MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
- if (OpNum == 0) { // move -> store
- unsigned InReg = MI->getOperand(1).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::STW,
- 3).addReg(InReg), FrameIndex);
- } else { // move -> load
- unsigned OutReg = MI->getOperand(0).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::LWZ, 2, OutReg), FrameIndex);
- }
- } else if ((Opc == PPC::OR8 &&
- MI->getOperand(1).getReg() == MI->getOperand(2).getReg())) {
- if (OpNum == 0) { // move -> store
- unsigned InReg = MI->getOperand(1).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::STD,
- 3).addReg(InReg), FrameIndex);
- } else { // move -> load
- unsigned OutReg = MI->getOperand(0).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::LD, 2, OutReg), FrameIndex);
- }
- } else if (Opc == PPC::FMRD) {
- if (OpNum == 0) { // move -> store
- unsigned InReg = MI->getOperand(1).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::STFD,
- 3).addReg(InReg), FrameIndex);
- } else { // move -> load
- unsigned OutReg = MI->getOperand(0).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::LFD, 2, OutReg), FrameIndex);
- }
- } else if (Opc == PPC::FMRS) {
- if (OpNum == 0) { // move -> store
- unsigned InReg = MI->getOperand(1).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::STFS,
- 3).addReg(InReg), FrameIndex);
- } else { // move -> load
- unsigned OutReg = MI->getOperand(0).getReg();
- NewMI = addFrameReference(BuildMI(TII, PPC::LFS, 2, OutReg), FrameIndex);
- }
+// needsFP - Return true if the specified function should have a dedicated frame
+// pointer register. This is true if the function has variable sized allocas or
+// if frame pointer elimination is disabled.
+//
+static bool needsFP(const MachineFunction &MF) {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ return NoFramePointerElim || MFI->hasVarSizedObjects() ||
+ (PerformTailCallOpt && MF.getInfo<PPCFunctionInfo>()->hasFastCall());
+}
+
+static bool spillsCR(const MachineFunction &MF) {
+ const PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
+ return FuncInfo->isCRSpilled();
+}
+
+BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
+ BitVector Reserved(getNumRegs());
+ Reserved.set(PPC::R0);
+ Reserved.set(PPC::R1);
+ Reserved.set(PPC::LR);
+ Reserved.set(PPC::LR8);
+ Reserved.set(PPC::RM);
+
+ // In Linux, r2 is reserved for the OS.
+ if (!Subtarget.isDarwin())
+ Reserved.set(PPC::R2);
+
+ // On PPC64, r13 is the thread pointer. Never allocate this register. Note
+ // that this is over conservative, as it also prevents allocation of R31 when
+ // the FP is not needed.
+ if (Subtarget.isPPC64()) {
+ Reserved.set(PPC::R13);
+ Reserved.set(PPC::R31);
+
+ if (!EnableRegisterScavenging)
+ Reserved.set(PPC::R0); // FIXME (64-bit): Remove
+
+ Reserved.set(PPC::X0);
+ Reserved.set(PPC::X1);
+ Reserved.set(PPC::X13);
+ Reserved.set(PPC::X31);
}
- if (NewMI)
- NewMI->copyKillDeadInfo(MI);
- return NewMI;
+ if (needsFP(MF))
+ Reserved.set(PPC::R31);
+
+ return Reserved;
}
//===----------------------------------------------------------------------===//
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
-// hasFP - Return true if the specified function should have a dedicated frame
-// pointer register. This is true if the function has variable sized allocas or
-// if frame pointer elimination is disabled.
-//
-static bool hasFP(const MachineFunction &MF) {
+// hasFP - Return true if the specified function actually has a dedicated frame
+// pointer register. This is true if the function needs a frame pointer and has
+// a non-zero stack size.
+bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
+ return MFI->getStackSize() && needsFP(MF);
+}
- // If frame pointers are forced, or if there are variable sized stack objects,
- // use a frame pointer.
- //
- return NoFramePointerElim || MFI->hasVarSizedObjects();
+/// 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 PPCRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
- if (hasFP(MF)) {
- // If we have a frame pointer, convert as follows:
- // ADJCALLSTACKDOWN -> lwz r0, 0(r31)
- // stwu, r0, -amount(r1)
- // ADJCALLSTACKUP -> addi, r1, r1, amount
- MachineInstr *Old = I;
- unsigned Amount = Old->getOperand(0).getImmedValue();
- if (Amount != 0) {
- // We need to keep the stack aligned properly. To do this, we round the
- // amount of space needed for the outgoing arguments up to the next
- // alignment boundary.
- unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
- Amount = (Amount+Align-1)/Align*Align;
-
- // Replace the pseudo instruction with a new instruction...
- if (Old->getOpcode() == PPC::ADJCALLSTACKDOWN) {
- if (!Subtarget.isPPC64()) {
- BuildMI(MBB, I, PPC::LWZ, 2, PPC::R0).addImm(0).addReg(PPC::R31);
- BuildMI(MBB, I, PPC::STWU, 3, PPC::R1)
- .addReg(PPC::R0).addImm(-Amount).addReg(PPC::R1);
- } else {
- BuildMI(MBB, I, PPC::LD, 2, PPC::X0).addImm(0).addReg(PPC::X31);
- BuildMI(MBB, I, PPC::STDU, 3, PPC::X1)
- .addReg(PPC::X0).addImm(-Amount/4).addReg(PPC::X1);
- }
+ if (PerformTailCallOpt && I->getOpcode() == PPC::ADJCALLSTACKUP) {
+ // Add (actually subtract) back the amount the callee popped on return.
+ if (int CalleeAmt = I->getOperand(1).getImm()) {
+ bool is64Bit = Subtarget.isPPC64();
+ CalleeAmt *= -1;
+ unsigned StackReg = is64Bit ? PPC::X1 : PPC::R1;
+ unsigned TmpReg = is64Bit ? PPC::X0 : PPC::R0;
+ unsigned ADDIInstr = is64Bit ? PPC::ADDI8 : PPC::ADDI;
+ unsigned ADDInstr = is64Bit ? PPC::ADD8 : PPC::ADD4;
+ unsigned LISInstr = is64Bit ? PPC::LIS8 : PPC::LIS;
+ unsigned ORIInstr = is64Bit ? PPC::ORI8 : PPC::ORI;
+
+ if (isInt16(CalleeAmt)) {
+ BuildMI(MBB, I, TII.get(ADDIInstr), StackReg).addReg(StackReg).
+ addImm(CalleeAmt);
} else {
- assert(Old->getOpcode() == PPC::ADJCALLSTACKUP);
- BuildMI(MBB, I, PPC::ADDI, 2, PPC::R1).addReg(PPC::R1).addImm(Amount);
+ MachineBasicBlock::iterator MBBI = I;
+ BuildMI(MBB, MBBI, TII.get(LISInstr), TmpReg)
+ .addImm(CalleeAmt >> 16);
+ BuildMI(MBB, MBBI, TII.get(ORIInstr), TmpReg)
+ .addReg(TmpReg, false, false, true)
+ .addImm(CalleeAmt & 0xFFFF);
+ BuildMI(MBB, MBBI, TII.get(ADDInstr))
+ .addReg(StackReg)
+ .addReg(StackReg)
+ .addReg(TmpReg);
}
}
}
+ // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
MBB.erase(I);
}
-void
-PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
- unsigned i = 0;
+/// findScratchRegister - Find a 'free' PPC register. Try for a call-clobbered
+/// register first and then a spilled callee-saved register if that fails.
+static
+unsigned findScratchRegister(MachineBasicBlock::iterator II, RegScavenger *RS,
+ const TargetRegisterClass *RC, int SPAdj) {
+ assert(RS && "Register scavenging must be on");
+ unsigned Reg = RS->FindUnusedReg(RC, true);
+ // FIXME: move ARM callee-saved reg scan to target independent code, then
+ // search for already spilled CS register here.
+ if (Reg == 0)
+ Reg = RS->scavengeRegister(RC, II, SPAdj);
+ return Reg;
+}
+
+/// lowerDynamicAlloc - Generate the code for allocating an object in the
+/// current frame. The sequence of code with be in the general form
+///
+/// addi R0, SP, #frameSize ; get the address of the previous frame
+/// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size
+/// addi Rnew, SP, #maxCalFrameSize ; get the top of the allocation
+///
+void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
+ int SPAdj, RegScavenger *RS) const {
+ // Get the instruction.
MachineInstr &MI = *II;
+ // Get the instruction's basic block.
MachineBasicBlock &MBB = *MI.getParent();
+ // Get the basic block's function.
MachineFunction &MF = *MBB.getParent();
+ // Get the frame info.
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+ // Determine whether 64-bit pointers are used.
+ bool LP64 = Subtarget.isPPC64();
- while (!MI.getOperand(i).isFrameIndex()) {
- ++i;
- assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
+ // Get the maximum call stack size.
+ unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
+ // Get the total frame size.
+ unsigned FrameSize = MFI->getStackSize();
+
+ // Get stack alignments.
+ unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
+ unsigned MaxAlign = MFI->getMaxAlignment();
+ assert(MaxAlign <= TargetAlign &&
+ "Dynamic alloca with large aligns not supported");
+
+ // Determine the previous frame's address. If FrameSize can't be
+ // represented as 16 bits or we need special alignment, then we load the
+ // previous frame's address from 0(SP). Why not do an addis of the hi?
+ // Because R0 is our only safe tmp register and addi/addis treat R0 as zero.
+ // Constructing the constant and adding would take 3 instructions.
+ // Fortunately, a frame greater than 32K is rare.
+ const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+ const TargetRegisterClass *RC = LP64 ? G8RC : GPRC;
+
+ // FIXME (64-bit): Use "findScratchRegister"
+ unsigned Reg;
+ if (EnableRegisterScavenging)
+ Reg = findScratchRegister(II, RS, RC, SPAdj);
+ else
+ Reg = PPC::R0;
+
+ if (MaxAlign < TargetAlign && isInt16(FrameSize)) {
+ BuildMI(MBB, II, TII.get(PPC::ADDI), Reg)
+ .addReg(PPC::R31)
+ .addImm(FrameSize);
+ } else if (LP64) {
+ if (EnableRegisterScavenging) // FIXME (64-bit): Use "true" part.
+ BuildMI(MBB, II, TII.get(PPC::LD), Reg)
+ .addImm(0)
+ .addReg(PPC::X1);
+ else
+ BuildMI(MBB, II, TII.get(PPC::LD), PPC::X0)
+ .addImm(0)
+ .addReg(PPC::X1);
+ } else {
+ BuildMI(MBB, II, TII.get(PPC::LWZ), Reg)
+ .addImm(0)
+ .addReg(PPC::R1);
}
+
+ // Grow the stack and update the stack pointer link, then determine the
+ // address of new allocated space.
+ if (LP64) {
+ if (EnableRegisterScavenging) // FIXME (64-bit): Use "true" part.
+ BuildMI(MBB, II, TII.get(PPC::STDUX))
+ .addReg(Reg, false, false, true)
+ .addReg(PPC::X1)
+ .addReg(MI.getOperand(1).getReg());
+ else
+ BuildMI(MBB, II, TII.get(PPC::STDUX))
+ .addReg(PPC::X0, false, false, true)
+ .addReg(PPC::X1)
+ .addReg(MI.getOperand(1).getReg());
- int FrameIndex = MI.getOperand(i).getFrameIndex();
+ if (!MI.getOperand(1).isKill())
+ BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
+ .addReg(PPC::X1)
+ .addImm(maxCallFrameSize);
+ else
+ // Implicitly kill the register.
+ BuildMI(MBB, II, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
+ .addReg(PPC::X1)
+ .addImm(maxCallFrameSize)
+ .addReg(MI.getOperand(1).getReg(), false, true, true);
+ } else {
+ BuildMI(MBB, II, TII.get(PPC::STWUX))
+ .addReg(Reg, false, false, true)
+ .addReg(PPC::R1)
+ .addReg(MI.getOperand(1).getReg());
- // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
- MI.getOperand(i).ChangeToRegister(hasFP(MF) ? PPC::R31 : PPC::R1, false);
+ if (!MI.getOperand(1).isKill())
+ BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
+ .addReg(PPC::R1)
+ .addImm(maxCallFrameSize);
+ else
+ // Implicitly kill the register.
+ BuildMI(MBB, II, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
+ .addReg(PPC::R1)
+ .addImm(maxCallFrameSize)
+ .addReg(MI.getOperand(1).getReg(), false, true, true);
+ }
+
+ // Discard the DYNALLOC instruction.
+ MBB.erase(II);
+}
+/// lowerCRSpilling - Generate the code for spilling a CR register. Instead of
+/// reserving a whole register (R0), we scrounge for one here. This generates
+/// code like this:
+///
+/// mfcr rA ; Move the conditional register into GPR rA.
+/// rlwinm rA, rA, SB, 0, 31 ; Shift the bits left so they are in CR0's slot.
+/// stw rA, FI ; Store rA to the frame.
+///
+void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
+ unsigned FrameIndex, int SPAdj,
+ RegScavenger *RS) const {
+ // Get the instruction.
+ MachineInstr &MI = *II; // ; SPILL_CR <SrcReg>, <offset>, <FI>
+ // Get the instruction's basic block.
+ MachineBasicBlock &MBB = *MI.getParent();
+
+ const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+ const TargetRegisterClass *RC = Subtarget.isPPC64() ? G8RC : GPRC;
+ unsigned Reg = findScratchRegister(II, RS, RC, SPAdj);
+
+ // We need to store the CR in the low 4-bits of the saved value. First, issue
+ // an MFCR to save all of the CRBits. Add an implicit kill of the CR.
+ if (!MI.getOperand(0).isKill())
+ BuildMI(MBB, II, TII.get(PPC::MFCR), Reg);
+ else
+ // Implicitly kill the CR register.
+ BuildMI(MBB, II, TII.get(PPC::MFCR), Reg)
+ .addReg(MI.getOperand(0).getReg(), false, true, true);
+
+ // If the saved register wasn't CR0, shift the bits left so that they are in
+ // CR0's slot.
+ unsigned SrcReg = MI.getOperand(0).getReg();
+ if (SrcReg != PPC::CR0)
+ // rlwinm rA, rA, ShiftBits, 0, 31.
+ BuildMI(MBB, II, TII.get(PPC::RLWINM), Reg)
+ .addReg(Reg, false, false, true)
+ .addImm(PPCRegisterInfo::getRegisterNumbering(SrcReg) * 4)
+ .addImm(0)
+ .addImm(31);
+
+ addFrameReference(BuildMI(MBB, II, TII.get(PPC::STW))
+ .addReg(Reg, false, false, MI.getOperand(1).getImm()),
+ FrameIndex);
+
+ // Discard the pseudo instruction.
+ MBB.erase(II);
+}
+
+void PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, RegScavenger *RS) const {
+ assert(SPAdj == 0 && "Unexpected");
+
+ // Get the instruction.
+ MachineInstr &MI = *II;
+ // Get the instruction's basic block.
+ MachineBasicBlock &MBB = *MI.getParent();
+ // Get the basic block's function.
+ MachineFunction &MF = *MBB.getParent();
+ // Get the frame info.
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+
+ // Find out which operand is the frame index.
+ unsigned FIOperandNo = 0;
+ while (!MI.getOperand(FIOperandNo).isFI()) {
+ ++FIOperandNo;
+ assert(FIOperandNo != MI.getNumOperands() &&
+ "Instr doesn't have FrameIndex operand!");
+ }
// Take into account whether it's an add or mem instruction
- unsigned OffIdx = (i == 2) ? 1 : 2;
+ unsigned OffsetOperandNo = (FIOperandNo == 2) ? 1 : 2;
+ if (MI.getOpcode() == TargetInstrInfo::INLINEASM)
+ OffsetOperandNo = FIOperandNo-1;
+
+ // Get the frame index.
+ int FrameIndex = MI.getOperand(FIOperandNo).getIndex();
+
+ // Get the frame pointer save index. Users of this index are primarily
+ // DYNALLOC instructions.
+ PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
+ int FPSI = FI->getFramePointerSaveIndex();
+ // Get the instruction opcode.
+ unsigned OpC = MI.getOpcode();
+
+ // Special case for dynamic alloca.
+ if (FPSI && FrameIndex == FPSI &&
+ (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
+ lowerDynamicAlloc(II, SPAdj, RS);
+ return;
+ }
+
+ // Special case for pseudo-op SPILL_CR.
+ if (EnableRegisterScavenging) // FIXME (64-bit): Enable by default.
+ if (OpC == PPC::SPILL_CR) {
+ lowerCRSpilling(II, FrameIndex, SPAdj, RS);
+ return;
+ }
+
+ // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
+ MI.getOperand(FIOperandNo).ChangeToRegister(hasFP(MF) ? PPC::R31 : PPC::R1,
+ false);
// Figure out if the offset in the instruction is shifted right two bits. This
// is true for instructions like "STD", which the machine implicitly adds two
// low zeros to.
bool isIXAddr = false;
- switch (MI.getOpcode()) {
+ switch (OpC) {
case PPC::LWA:
case PPC::LD:
case PPC::STD:
break;
}
-
// Now add the frame object offset to the offset from r1.
- int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
-
+ int Offset = MFI->getObjectOffset(FrameIndex);
if (!isIXAddr)
- Offset += MI.getOperand(OffIdx).getImmedValue();
+ Offset += MI.getOperand(OffsetOperandNo).getImm();
else
- Offset += MI.getOperand(OffIdx).getImmedValue() << 2;
+ Offset += MI.getOperand(OffsetOperandNo).getImm() << 2;
// If we're not using a Frame Pointer that has been set to the value of the
// SP before having the stack size subtracted from it, then add the stack size
// to Offset to get the correct offset.
- Offset += MF.getFrameInfo()->getStackSize();
+ Offset += MFI->getStackSize();
- if (Offset > 32767 || Offset < -32768) {
- // Insert a set of r0 with the full offset value before the ld, st, or add
- MachineBasicBlock *MBB = MI.getParent();
- BuildMI(*MBB, II, PPC::LIS, 1, PPC::R0).addImm(Offset >> 16);
- BuildMI(*MBB, II, PPC::ORI, 2, PPC::R0).addReg(PPC::R0).addImm(Offset);
-
- // convert into indexed form of the instruction
- // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
- // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
- assert(ImmToIdxMap.count(MI.getOpcode()) &&
+ // If we can, encode the offset directly into the instruction. If this is a
+ // normal PPC "ri" instruction, any 16-bit value can be safely encoded. If
+ // this is a PPC64 "ix" instruction, only a 16-bit value with the low two bits
+ // clear can be encoded. This is extremely uncommon, because normally you
+ // only "std" to a stack slot that is at least 4-byte aligned, but it can
+ // happen in invalid code.
+ if (isInt16(Offset) && (!isIXAddr || (Offset & 3) == 0)) {
+ if (isIXAddr)
+ Offset >>= 2; // The actual encoded value has the low two bits zero.
+ MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset);
+ return;
+ }
+
+ // The offset doesn't fit into a single register, scavenge one to build the
+ // offset in.
+ // FIXME: figure out what SPAdj is doing here.
+
+ // FIXME (64-bit): Use "findScratchRegister".
+ unsigned SReg;
+ if (EnableRegisterScavenging)
+ SReg = findScratchRegister(II, RS, &PPC::GPRCRegClass, SPAdj);
+ else
+ SReg = PPC::R0;
+
+ // Insert a set of rA with the full offset value before the ld, st, or add
+ BuildMI(MBB, II, TII.get(PPC::LIS), SReg)
+ .addImm(Offset >> 16);
+ BuildMI(MBB, II, TII.get(PPC::ORI), SReg)
+ .addReg(SReg, false, false, true)
+ .addImm(Offset);
+
+ // Convert into indexed form of the instruction:
+ //
+ // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
+ // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
+ unsigned OperandBase;
+
+ if (OpC != TargetInstrInfo::INLINEASM) {
+ assert(ImmToIdxMap.count(OpC) &&
"No indexed form of load or store available!");
- unsigned NewOpcode = ImmToIdxMap.find(MI.getOpcode())->second;
- MI.setOpcode(NewOpcode);
- MI.getOperand(1).ChangeToRegister(MI.getOperand(i).getReg(), false);
- MI.getOperand(2).ChangeToRegister(PPC::R0, false);
+ unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
+ MI.setDesc(TII.get(NewOpcode));
+ OperandBase = 1;
} else {
- if (isIXAddr) {
- assert((Offset & 3) == 0 && "Invalid frame offset!");
- Offset >>= 2; // The actual encoded value has the low two bits zero.
- }
- MI.getOperand(OffIdx).ChangeToImmediate(Offset);
+ OperandBase = OffsetOperandNo;
}
+
+ unsigned StackReg = MI.getOperand(FIOperandNo).getReg();
+ MI.getOperand(OperandBase).ChangeToRegister(StackReg, false);
+ MI.getOperand(OperandBase + 1).ChangeToRegister(SReg, false);
}
/// VRRegNo - Map from a numbered VR register to its enum value.
bool RemovedAllMTVRSAVEs = true;
// See if we can find and remove the MTVRSAVE instruction from all of the
// epilog blocks.
- const TargetInstrInfo &TII = *MF->getTarget().getInstrInfo();
for (MachineFunction::iterator I = MF->begin(), E = MF->end(); I != E; ++I) {
// If last instruction is a return instruction, add an epilogue
- if (!I->empty() && TII.isReturn(I->back().getOpcode())) {
+ if (!I->empty() && I->back().getDesc().isReturn()) {
bool FoundIt = false;
for (MBBI = I->end(); MBBI != I->begin(); ) {
--MBBI;
// HandleVRSaveUpdate - MI is the UPDATE_VRSAVE instruction introduced by the
// instruction selector. Based on the vector registers that have been used,
// transform this into the appropriate ORI instruction.
-static void HandleVRSaveUpdate(MachineInstr *MI, const bool *UsedRegs) {
+static void HandleVRSaveUpdate(MachineInstr *MI, const TargetInstrInfo &TII) {
+ MachineFunction *MF = MI->getParent()->getParent();
+
unsigned UsedRegMask = 0;
for (unsigned i = 0; i != 32; ++i)
- if (UsedRegs[VRRegNo[i]])
+ if (MF->getRegInfo().isPhysRegUsed(VRRegNo[i]))
UsedRegMask |= 1 << (31-i);
// Live in and live out values already must be in the mask, so don't bother
// marking them.
- MachineFunction *MF = MI->getParent()->getParent();
- for (MachineFunction::livein_iterator I =
- MF->livein_begin(), E = MF->livein_end(); I != E; ++I) {
+ for (MachineRegisterInfo::livein_iterator
+ I = MF->getRegInfo().livein_begin(),
+ E = MF->getRegInfo().livein_end(); I != E; ++I) {
unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(I->first);
if (VRRegNo[RegNo] == I->first) // If this really is a vector reg.
UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
}
- for (MachineFunction::liveout_iterator I =
- MF->liveout_begin(), E = MF->liveout_end(); I != E; ++I) {
+ for (MachineRegisterInfo::liveout_iterator
+ I = MF->getRegInfo().liveout_begin(),
+ E = MF->getRegInfo().liveout_end(); I != E; ++I) {
unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(*I);
if (VRRegNo[RegNo] == *I) // If this really is a vector reg.
UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
}
- unsigned SrcReg = MI->getOperand(1).getReg();
- unsigned DstReg = MI->getOperand(0).getReg();
// If no registers are used, turn this into a copy.
if (UsedRegMask == 0) {
// Remove all VRSAVE code.
RemoveVRSaveCode(MI);
return;
- } else if ((UsedRegMask & 0xFFFF) == UsedRegMask) {
- BuildMI(*MI->getParent(), MI, PPC::ORI, 2, DstReg)
- .addReg(SrcReg).addImm(UsedRegMask);
+ }
+
+ unsigned SrcReg = MI->getOperand(1).getReg();
+ unsigned DstReg = MI->getOperand(0).getReg();
+
+ if ((UsedRegMask & 0xFFFF) == UsedRegMask) {
+ if (DstReg != SrcReg)
+ BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
+ .addReg(SrcReg)
+ .addImm(UsedRegMask);
+ else
+ BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
+ .addReg(SrcReg, false, false, true)
+ .addImm(UsedRegMask);
} else if ((UsedRegMask & 0xFFFF0000) == UsedRegMask) {
- BuildMI(*MI->getParent(), MI, PPC::ORIS, 2, DstReg)
- .addReg(SrcReg).addImm(UsedRegMask >> 16);
+ if (DstReg != SrcReg)
+ BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
+ .addReg(SrcReg)
+ .addImm(UsedRegMask >> 16);
+ else
+ BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
+ .addReg(SrcReg, false, false, true)
+ .addImm(UsedRegMask >> 16);
} else {
- BuildMI(*MI->getParent(), MI, PPC::ORIS, 2, DstReg)
- .addReg(SrcReg).addImm(UsedRegMask >> 16);
- BuildMI(*MI->getParent(), MI, PPC::ORI, 2, DstReg)
- .addReg(DstReg).addImm(UsedRegMask & 0xFFFF);
+ if (DstReg != SrcReg)
+ BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
+ .addReg(SrcReg)
+ .addImm(UsedRegMask >> 16);
+ else
+ BuildMI(*MI->getParent(), MI, TII.get(PPC::ORIS), DstReg)
+ .addReg(SrcReg, false, false, true)
+ .addImm(UsedRegMask >> 16);
+
+ BuildMI(*MI->getParent(), MI, TII.get(PPC::ORI), DstReg)
+ .addReg(DstReg, false, false, true)
+ .addImm(UsedRegMask & 0xFFFF);
}
// Remove the old UPDATE_VRSAVE instruction.
MI->eraseFromParent();
}
+/// determineFrameLayout - Determine the size of the frame and maximum call
+/// frame size.
+void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+
+ // Get the number of bytes to allocate from the FrameInfo
+ unsigned FrameSize = MFI->getStackSize();
+
+ // Get the alignments provided by the target, and the maximum alignment
+ // (if any) of the fixed frame objects.
+ unsigned MaxAlign = MFI->getMaxAlignment();
+ unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
+ unsigned AlignMask = TargetAlign - 1; //
+
+ // 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).
+ if (FrameSize <= 224 && // Fits in red zone.
+ !MFI->hasVarSizedObjects() && // No dynamic alloca.
+ !MFI->hasCalls() && // No calls.
+ (!ALIGN_STACK || MaxAlign <= TargetAlign)) { // No special alignment.
+ // No need for frame
+ MFI->setStackSize(0);
+ return;
+ }
+
+ // 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 =
+ PPCFrameInfo::getMinCallFrameSize(Subtarget.isPPC64(),
+ Subtarget.isMachoABI());
+ maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
+
+ // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
+ // that allocations will be aligned.
+ if (MFI->hasVarSizedObjects())
+ maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
+
+ // Update maximum call frame size.
+ MFI->setMaxCallFrameSize(maxCallFrameSize);
+
+ // Include call frame size in total.
+ FrameSize += maxCallFrameSize;
+
+ // Make sure the frame is aligned.
+ FrameSize = (FrameSize + AlignMask) & ~AlignMask;
+
+ // Update frame info.
+ MFI->setStackSize(FrameSize);
+}
+
+void
+PPCRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
+ RegScavenger *RS) const {
+ // Save and clear the LR state.
+ PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
+ unsigned LR = getRARegister();
+ FI->setMustSaveLR(MustSaveLR(MF, LR));
+ MF.getRegInfo().setPhysRegUnused(LR);
+
+ // Save R31 if necessary
+ int FPSI = FI->getFramePointerSaveIndex();
+ bool IsPPC64 = Subtarget.isPPC64();
+ bool IsELF32_ABI = Subtarget.isELF32_ABI();
+ bool IsMachoABI = Subtarget.isMachoABI();
+ MachineFrameInfo *MFI = MF.getFrameInfo();
+
+ // If the frame pointer save index hasn't been defined yet.
+ if (!FPSI && (NoFramePointerElim || MFI->hasVarSizedObjects()) &&
+ IsELF32_ABI) {
+ // Find out what the fix offset of the frame pointer save area.
+ int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64,
+ IsMachoABI);
+ // Allocate the frame index for frame pointer save area.
+ FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
+ // Save the result.
+ FI->setFramePointerSaveIndex(FPSI);
+ }
+
+ // Reserve stack space to move the linkage area to in case of a tail call.
+ int TCSPDelta = 0;
+ if (PerformTailCallOpt && (TCSPDelta=FI->getTailCallSPDelta()) < 0) {
+ int AddFPOffsetAmount = IsELF32_ABI ? -4 : 0;
+ MF.getFrameInfo()->CreateFixedObject( -1 * TCSPDelta,
+ AddFPOffsetAmount + TCSPDelta);
+ }
+ // Reserve a slot closest to SP or frame pointer if we have a dynalloc or
+ // a large stack, which will require scavenging a register to materialize a
+ // large offset.
+ // FIXME: this doesn't actually check stack size, so is a bit pessimistic
+ // FIXME: doesn't detect whether or not we need to spill vXX, which requires
+ // r0 for now.
-void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
+ if (EnableRegisterScavenging) // FIXME (64-bit): Enable.
+ if (needsFP(MF) || spillsCR(MF)) {
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+ const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
+ const TargetRegisterClass *RC = IsPPC64 ? G8RC : GPRC;
+ RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
+ RC->getAlignment()));
+ }
+}
+
+void
+PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineDebugInfo *DebugInfo = MFI->getMachineDebugInfo();
+ MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
+ bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
+ !MF.getFunction()->doesNotThrow() ||
+ UnwindTablesMandatory;
- // Do we have a frame pointer for this function?
- bool HasFP = hasFP(MF);
+ // Prepare for frame info.
+ unsigned FrameLabelId = 0;
// Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
// process it.
for (unsigned i = 0; MBBI != MBB.end(); ++i, ++MBBI) {
if (MBBI->getOpcode() == PPC::UPDATE_VRSAVE) {
- HandleVRSaveUpdate(MBBI, MF.getUsedPhysregs());
+ HandleVRSaveUpdate(MBBI, TII);
break;
}
}
// Move MBBI back to the beginning of the function.
MBBI = MBB.begin();
+
+ // Work out frame sizes.
+ determineFrameLayout(MF);
+ unsigned FrameSize = MFI->getStackSize();
- // Get the number of bytes to allocate from the FrameInfo
- unsigned NumBytes = MFI->getStackSize();
+ int NegFrameSize = -FrameSize;
- // Get the alignments provided by the target, and the maximum alignment
- // (if any) of the fixed frame objects.
- unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
- unsigned MaxAlign = MFI->getMaxAlignment();
+ // Get processor type.
+ bool IsPPC64 = Subtarget.isPPC64();
+ // Get operating system
+ bool IsMachoABI = Subtarget.isMachoABI();
+ // Check if the link register (LR) must be saved.
+ PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
+ bool MustSaveLR = FI->mustSaveLR();
+ // Do we have a frame pointer for this function?
+ bool HasFP = hasFP(MF) && FrameSize;
+
+ int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
+ int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
- // If we have calls, we cannot use the red zone to store callee save registers
- // and we must set up a stack frame, so calculate the necessary size here.
- if (MFI->hasCalls()) {
- // We reserve argument space for call sites in the function immediately on
- // entry to the current function. This eliminates the need for add/sub
- // brackets around call sites.
- NumBytes += MFI->getMaxCallFrameSize();
- }
+ if (IsPPC64) {
+ if (MustSaveLR)
+ 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 (MustSaveLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::STD))
+ .addReg(PPC::X0)
+ .addImm(LROffset / 4)
+ .addReg(PPC::X1);
+ } else {
+ if (MustSaveLR)
+ 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 we are a leaf function, and use up to 224 bytes of stack space,
- // and don't have a frame pointer, then we do not need to adjust the stack
- // pointer (we fit in the Red Zone).
- if ((NumBytes == 0) || (NumBytes <= 224 && !HasFP && !MFI->hasCalls() &&
- MaxAlign <= TargetAlign)) {
- MFI->setStackSize(0);
- return;
+ if (MustSaveLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::STW))
+ .addReg(PPC::R0)
+ .addImm(LROffset)
+ .addReg(PPC::R1);
}
+
+ // Skip if a leaf routine.
+ if (!FrameSize) return;
+
+ // Get stack alignments.
+ unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
+ unsigned MaxAlign = MFI->getMaxAlignment();
- // Add the size of R1 to NumBytes size for the store of R1 to the bottom
- // of the stack and round the size to a multiple of the alignment.
- unsigned Align = std::max(TargetAlign, MaxAlign);
- unsigned GPRSize = Subtarget.isPPC64() ? 8 : 4;
- unsigned Size = HasFP ? GPRSize + GPRSize : GPRSize;
- NumBytes = (NumBytes+Size+Align-1)/Align*Align;
-
- // Update frame info to pretend that this is part of the stack...
- MFI->setStackSize(NumBytes);
- int NegNumbytes = -NumBytes;
-
- // Adjust stack pointer: r1 -= numbytes.
+ if (needsFrameMoves) {
+ // Mark effective beginning of when frame pointer becomes valid.
+ FrameLabelId = MMI->NextLabelID();
+ BuildMI(MBB, MBBI, TII.get(PPC::DBG_LABEL)).addImm(FrameLabelId);
+ }
+
+ // 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) && MaxAlign < 32767&&"Invalid alignment!");
- assert(isInt16(0-NumBytes) && "Unhandled stack size and alignment!");
- BuildMI(MBB, MBBI, PPC::RLWINM, 4, PPC::R0)
- .addReg(PPC::R1).addImm(0).addImm(32-Log2_32(MaxAlign)).addImm(31);
- BuildMI(MBB, MBBI, PPC::SUBFIC,2,PPC::R0).addReg(PPC::R0)
- .addImm(0-NumBytes);
- BuildMI(MBB, MBBI, PPC::STWUX, 3)
- .addReg(PPC::R1).addReg(PPC::R1).addReg(PPC::R0);
- } else if (NumBytes <= 32768) {
- BuildMI(MBB, MBBI, PPC::STWU, 3,
- PPC::R1).addReg(PPC::R1).addImm(NegNumbytes).addReg(PPC::R1);
+ if (ALIGN_STACK && MaxAlign > TargetAlign) {
+ assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
+ assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
+
+ BuildMI(MBB, MBBI, TII.get(PPC::RLWINM), PPC::R0)
+ .addReg(PPC::R1)
+ .addImm(0)
+ .addImm(32 - Log2_32(MaxAlign))
+ .addImm(31);
+ BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC) ,PPC::R0)
+ .addReg(PPC::R0, false, false, true)
+ .addImm(NegFrameSize);
+ BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
+ .addReg(PPC::R1)
+ .addReg(PPC::R1)
+ .addReg(PPC::R0);
+ } else if (isInt16(NegFrameSize)) {
+ BuildMI(MBB, MBBI, TII.get(PPC::STWU), PPC::R1)
+ .addReg(PPC::R1)
+ .addImm(NegFrameSize)
+ .addReg(PPC::R1);
} else {
- BuildMI(MBB, MBBI, PPC::LIS, 1, PPC::R0).addImm(NegNumbytes >> 16);
- BuildMI(MBB, MBBI, PPC::ORI, 2, PPC::R0).addReg(PPC::R0)
- .addImm(NegNumbytes & 0xFFFF);
- BuildMI(MBB, MBBI, PPC::STWUX, 3).addReg(PPC::R1).addReg(PPC::R1)
+ BuildMI(MBB, MBBI, TII.get(PPC::LIS), PPC::R0)
+ .addImm(NegFrameSize >> 16);
+ BuildMI(MBB, MBBI, TII.get(PPC::ORI), PPC::R0)
+ .addReg(PPC::R0, false, false, true)
+ .addImm(NegFrameSize & 0xFFFF);
+ BuildMI(MBB, MBBI, TII.get(PPC::STWUX))
+ .addReg(PPC::R1)
+ .addReg(PPC::R1)
.addReg(PPC::R0);
}
} else { // PPC64.
- if (MaxAlign > TargetAlign) {
- assert(isPowerOf2_32(MaxAlign) && MaxAlign < 32767&&"Invalid alignment!");
- assert(isInt16(0-NumBytes) && "Unhandled stack size and alignment!");
- BuildMI(MBB, MBBI, PPC::RLDICL, 3, PPC::X0)
- .addReg(PPC::X1).addImm(0).addImm(64-Log2_32(MaxAlign));
- BuildMI(MBB, MBBI, PPC::SUBFIC8, 2, PPC::X0).addReg(PPC::X0)
- .addImm(0-NumBytes);
- BuildMI(MBB, MBBI, PPC::STDUX, 3)
- .addReg(PPC::X1).addReg(PPC::X1).addReg(PPC::X0);
- } else if (NumBytes <= 32768*4) {
- BuildMI(MBB, MBBI, PPC::STDU, 3, PPC::X1)
- .addReg(PPC::X1).addImm(NegNumbytes/4).addReg(PPC::X1);
+ if (ALIGN_STACK && MaxAlign > TargetAlign) {
+ assert(isPowerOf2_32(MaxAlign)&&isInt16(MaxAlign)&&"Invalid alignment!");
+ assert(isInt16(NegFrameSize) && "Unhandled stack size and alignment!");
+
+ BuildMI(MBB, MBBI, TII.get(PPC::RLDICL), PPC::X0)
+ .addReg(PPC::X1)
+ .addImm(0)
+ .addImm(64 - Log2_32(MaxAlign));
+ BuildMI(MBB, MBBI, TII.get(PPC::SUBFIC8), PPC::X0)
+ .addReg(PPC::X0)
+ .addImm(NegFrameSize);
+ BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
+ .addReg(PPC::X1)
+ .addReg(PPC::X1)
+ .addReg(PPC::X0);
+ } else if (isInt16(NegFrameSize)) {
+ BuildMI(MBB, MBBI, TII.get(PPC::STDU), PPC::X1)
+ .addReg(PPC::X1)
+ .addImm(NegFrameSize / 4)
+ .addReg(PPC::X1);
} else {
- BuildMI(MBB, MBBI, PPC::LIS8, 1, PPC::X0).addImm(NegNumbytes >> 16);
- BuildMI(MBB, MBBI, PPC::ORI8, 2, PPC::X0).addReg(PPC::X0)
- .addImm(NegNumbytes & 0xFFFF);
- BuildMI(MBB, MBBI, PPC::STDUX, 3).addReg(PPC::X1).addReg(PPC::X1)
+ BuildMI(MBB, MBBI, TII.get(PPC::LIS8), PPC::X0)
+ .addImm(NegFrameSize >> 16);
+ BuildMI(MBB, MBBI, TII.get(PPC::ORI8), PPC::X0)
+ .addReg(PPC::X0, false, false, true)
+ .addImm(NegFrameSize & 0xFFFF);
+ BuildMI(MBB, MBBI, TII.get(PPC::STDUX))
+ .addReg(PPC::X1)
+ .addReg(PPC::X1)
.addReg(PPC::X0);
}
}
- if (DebugInfo && DebugInfo->hasInfo()) {
- std::vector<MachineMove *> &Moves = DebugInfo->getFrameMoves();
- unsigned LabelID = DebugInfo->NextLabelID();
+ if (needsFrameMoves) {
+ std::vector<MachineMove> &Moves = MMI->getFrameMoves();
- // Mark effective beginning of when frame pointer becomes valid.
- BuildMI(MBB, MBBI, PPC::DWARF_LABEL, 1).addImm(LabelID);
+ if (NegFrameSize) {
+ // Show update of SP.
+ MachineLocation SPDst(MachineLocation::VirtualFP);
+ MachineLocation SPSrc(MachineLocation::VirtualFP, NegFrameSize);
+ Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
+ } else {
+ MachineLocation SP(IsPPC64 ? PPC::X31 : PPC::R31);
+ Moves.push_back(MachineMove(FrameLabelId, SP, SP));
+ }
- // Show update of SP.
- MachineLocation SPDst(MachineLocation::VirtualFP);
- MachineLocation SPSrc(MachineLocation::VirtualFP, NegNumbytes);
- Moves.push_back(new MachineMove(LabelID, SPDst, SPSrc));
+ if (HasFP) {
+ MachineLocation FPDst(MachineLocation::VirtualFP, FPOffset);
+ MachineLocation FPSrc(IsPPC64 ? PPC::X31 : PPC::R31);
+ Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
+ }
// Add callee saved registers to move list.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
- MachineLocation CSDst(MachineLocation::VirtualFP,
- MFI->getObjectOffset(CSI[I].getFrameIdx()));
- MachineLocation CSSrc(CSI[I].getReg());
- Moves.push_back(new MachineMove(LabelID, CSDst, CSSrc));
+ int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
+ unsigned Reg = CSI[I].getReg();
+ if (Reg == PPC::LR || Reg == PPC::LR8 || Reg == PPC::RM) continue;
+ MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
+ MachineLocation CSSrc(Reg);
+ Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc));
}
+
+ MachineLocation LRDst(MachineLocation::VirtualFP, LROffset);
+ MachineLocation LRSrc(IsPPC64 ? PPC::LR8 : PPC::LR);
+ Moves.push_back(MachineMove(FrameLabelId, LRDst, LRSrc));
+
+ // Mark effective beginning of when frame pointer is ready.
+ unsigned ReadyLabelId = MMI->NextLabelID();
+ BuildMI(MBB, MBBI, TII.get(PPC::DBG_LABEL)).addImm(ReadyLabelId);
+
+ MachineLocation FPDst(HasFP ? (IsPPC64 ? PPC::X31 : PPC::R31) :
+ (IsPPC64 ? PPC::X1 : PPC::R1));
+ MachineLocation FPSrc(MachineLocation::VirtualFP);
+ Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
-
- // If there is a frame pointer, copy R1 (SP) into R31 (FP)
+
+ // If there is a frame pointer, copy R1 into R31
if (HasFP) {
- if (!Subtarget.isPPC64()) {
- BuildMI(MBB, MBBI, PPC::STW, 3)
- .addReg(PPC::R31).addImm(GPRSize).addReg(PPC::R1);
- BuildMI(MBB, MBBI, PPC::OR, 2, PPC::R31).addReg(PPC::R1).addReg(PPC::R1);
+ if (!IsPPC64) {
+ BuildMI(MBB, MBBI, TII.get(PPC::OR), PPC::R31)
+ .addReg(PPC::R1)
+ .addReg(PPC::R1);
} else {
- BuildMI(MBB, MBBI, PPC::STD, 3)
- .addReg(PPC::X31).addImm(GPRSize/4).addReg(PPC::X1);
- BuildMI(MBB, MBBI, PPC::OR8, 2, PPC::X31).addReg(PPC::X1).addReg(PPC::X1);
+ BuildMI(MBB, MBBI, TII.get(PPC::OR8), PPC::X31)
+ .addReg(PPC::X1)
+ .addReg(PPC::X1);
}
}
}
void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = prior(MBB.end());
- assert(MBBI->getOpcode() == PPC::BLR &&
+ unsigned RetOpcode = MBBI->getOpcode();
+
+ 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");
// Get alignment info so we know how to restore r1
const MachineFrameInfo *MFI = MF.getFrameInfo();
unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
+ unsigned MaxAlign = MFI->getMaxAlignment();
// Get the number of bytes allocated from the FrameInfo.
- unsigned NumBytes = MFI->getStackSize();
- unsigned GPRSize = Subtarget.isPPC64() ? 8 : 4;
-
- if (NumBytes != 0) {
- // If this function has a frame pointer, load the saved stack pointer from
- // its stack slot.
- if (hasFP(MF)) {
- if (!Subtarget.isPPC64()) {
- BuildMI(MBB, MBBI, PPC::LWZ, 2, PPC::R31)
- .addImm(GPRSize).addReg(PPC::R31);
- } else {
- BuildMI(MBB, MBBI, PPC::LD, 2, PPC::X31)
- .addImm(GPRSize/4).addReg(PPC::X31);
- }
- }
-
+ int FrameSize = MFI->getStackSize();
+
+ // Get processor type.
+ bool IsPPC64 = Subtarget.isPPC64();
+ // Get operating system
+ bool IsMachoABI = Subtarget.isMachoABI();
+ // Check if the link register (LR) has been saved.
+ PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
+ bool MustSaveLR = FI->mustSaveLR();
+ // Do we have a frame pointer for this function?
+ bool HasFP = hasFP(MF) && FrameSize;
+
+ int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
+ int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
+
+ 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;
+ }
+
+ if (FrameSize) {
// 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 (NumBytes < 32768 && TargetAlign >= MFI->getMaxAlignment()) {
- BuildMI(MBB, MBBI, PPC::ADDI, 2, PPC::R1)
- .addReg(PPC::R1).addImm(NumBytes);
+ if (!IsPPC64) {
+ // If this function contained a fastcc call and PerformTailCallOpt is
+ // enabled (=> hasFastCall()==true) the fastcc call might contain a tail
+ // call which invalidates the stack pointer value in SP(0). So we use the
+ // value of R31 in this case.
+ if (FI->hasFastCall() && isInt16(FrameSize)) {
+ assert(hasFP(MF) && "Expecting a valid the frame pointer.");
+ BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
+ .addReg(PPC::R31).addImm(FrameSize);
+ } else if(FI->hasFastCall()) {
+ BuildMI(MBB, MBBI, TII.get(PPC::LIS), PPC::R0)
+ .addImm(FrameSize >> 16);
+ BuildMI(MBB, MBBI, TII.get(PPC::ORI), PPC::R0)
+ .addReg(PPC::R0, false, false, true)
+ .addImm(FrameSize & 0xFFFF);
+ BuildMI(MBB, MBBI, TII.get(PPC::ADD4))
+ .addReg(PPC::R1)
+ .addReg(PPC::R31)
+ .addReg(PPC::R0);
+ } else if (isInt16(FrameSize) &&
+ (!ALIGN_STACK || TargetAlign >= MaxAlign) &&
+ !MFI->hasVarSizedObjects()) {
+ BuildMI(MBB, MBBI, TII.get(PPC::ADDI), PPC::R1)
+ .addReg(PPC::R1).addImm(FrameSize);
} else {
- BuildMI(MBB, MBBI, PPC::LWZ, 2, PPC::R1).addImm(0).addReg(PPC::R1);
+ BuildMI(MBB, MBBI, TII.get(PPC::LWZ),PPC::R1).addImm(0).addReg(PPC::R1);
}
} else {
- if (NumBytes < 32768 && TargetAlign >= MFI->getMaxAlignment()) {
- BuildMI(MBB, MBBI, PPC::ADDI8, 2, PPC::X1)
- .addReg(PPC::X1).addImm(NumBytes);
+ if (FI->hasFastCall() && isInt16(FrameSize)) {
+ assert(hasFP(MF) && "Expecting a valid the frame pointer.");
+ BuildMI(MBB, MBBI, TII.get(PPC::ADDI8), PPC::X1)
+ .addReg(PPC::X31).addImm(FrameSize);
+ } else if(FI->hasFastCall()) {
+ BuildMI(MBB, MBBI, TII.get(PPC::LIS8), PPC::X0)
+ .addImm(FrameSize >> 16);
+ BuildMI(MBB, MBBI, TII.get(PPC::ORI8), PPC::X0)
+ .addReg(PPC::X0, false, false, true)
+ .addImm(FrameSize & 0xFFFF);
+ BuildMI(MBB, MBBI, TII.get(PPC::ADD8))
+ .addReg(PPC::X1)
+ .addReg(PPC::X31)
+ .addReg(PPC::X0);
+ } 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, PPC::LD, 2, PPC::X1).addImm(0).addReg(PPC::X1);
+ BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
}
}
}
+
+ if (IsPPC64) {
+ if (MustSaveLR)
+ 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 (MustSaveLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::MTLR8)).addReg(PPC::X0);
+ } else {
+ if (MustSaveLR)
+ 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 (MustSaveLR)
+ BuildMI(MBB, MBBI, TII.get(PPC::MTLR)).addReg(PPC::R0);
+ }
+
+ // Callee pop calling convention. Pop parameter/linkage area. Used for tail
+ // call optimization
+ if (PerformTailCallOpt && RetOpcode == PPC::BLR &&
+ MF.getFunction()->getCallingConv() == CallingConv::Fast) {
+ PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
+ unsigned CallerAllocatedAmt = FI->getMinReservedArea();
+ unsigned StackReg = IsPPC64 ? PPC::X1 : PPC::R1;
+ unsigned FPReg = IsPPC64 ? PPC::X31 : PPC::R31;
+ unsigned TmpReg = IsPPC64 ? PPC::X0 : PPC::R0;
+ unsigned ADDIInstr = IsPPC64 ? PPC::ADDI8 : PPC::ADDI;
+ unsigned ADDInstr = IsPPC64 ? PPC::ADD8 : PPC::ADD4;
+ unsigned LISInstr = IsPPC64 ? PPC::LIS8 : PPC::LIS;
+ unsigned ORIInstr = IsPPC64 ? PPC::ORI8 : PPC::ORI;
+
+ if (CallerAllocatedAmt && isInt16(CallerAllocatedAmt)) {
+ BuildMI(MBB, MBBI, TII.get(ADDIInstr), StackReg)
+ .addReg(StackReg).addImm(CallerAllocatedAmt);
+ } else {
+ BuildMI(MBB, MBBI, TII.get(LISInstr), TmpReg)
+ .addImm(CallerAllocatedAmt >> 16);
+ BuildMI(MBB, MBBI, TII.get(ORIInstr), TmpReg)
+ .addReg(TmpReg, false, false, true)
+ .addImm(CallerAllocatedAmt & 0xFFFF);
+ BuildMI(MBB, MBBI, TII.get(ADDInstr))
+ .addReg(StackReg)
+ .addReg(FPReg)
+ .addReg(TmpReg);
+ }
+ } else if (RetOpcode == PPC::TCRETURNdi) {
+ MBBI = prior(MBB.end());
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, TII.get(PPC::TAILB)).
+ addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
+ } else if (RetOpcode == PPC::TCRETURNri) {
+ MBBI = prior(MBB.end());
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ assert(JumpTarget.isReg() && "Expecting register operand.");
+ BuildMI(MBB, MBBI, TII.get(PPC::TAILBCTR));
+ } else if (RetOpcode == PPC::TCRETURNai) {
+ MBBI = prior(MBB.end());
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, TII.get(PPC::TAILBA)).addImm(JumpTarget.getImm());
+ } else if (RetOpcode == PPC::TCRETURNdi8) {
+ MBBI = prior(MBB.end());
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, TII.get(PPC::TAILB8)).
+ addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
+ } else if (RetOpcode == PPC::TCRETURNri8) {
+ MBBI = prior(MBB.end());
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ assert(JumpTarget.isReg() && "Expecting register operand.");
+ BuildMI(MBB, MBBI, TII.get(PPC::TAILBCTR8));
+ } else if (RetOpcode == PPC::TCRETURNai8) {
+ MBBI = prior(MBB.end());
+ MachineOperand &JumpTarget = MBBI->getOperand(0);
+ BuildMI(MBB, MBBI, TII.get(PPC::TAILBA8)).addImm(JumpTarget.getImm());
+ }
}
unsigned PPCRegisterInfo::getRARegister() const {
return !Subtarget.isPPC64() ? PPC::LR : PPC::LR8;
-
}
unsigned PPCRegisterInfo::getFrameRegister(MachineFunction &MF) const {
return hasFP(MF) ? PPC::X31 : PPC::X1;
}
-void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove *> &Moves)
+void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves)
const {
// Initial state of the frame pointer is R1.
MachineLocation Dst(MachineLocation::VirtualFP);
MachineLocation Src(PPC::R1, 0);
- Moves.push_back(new MachineMove(0, Dst, Src));
+ Moves.push_back(MachineMove(0, Dst, Src));
+}
+
+unsigned PPCRegisterInfo::getEHExceptionRegister() const {
+ return !Subtarget.isPPC64() ? PPC::R3 : PPC::X3;
+}
+
+unsigned PPCRegisterInfo::getEHHandlerRegister() const {
+ return !Subtarget.isPPC64() ? PPC::R4 : PPC::X4;
+}
+
+int PPCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
+ // FIXME: Most probably dwarf numbers differs for Linux and Darwin
+ return PPCGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
}
#include "PPCGenRegisterInfo.inc"
projects / oota-llvm.git / blobdiff