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-rw-r--r--lib/Target/PowerPC/PPCRegisterInfo.cpp301
1 files changed, 151 insertions, 150 deletions
diff --git a/lib/Target/PowerPC/PPCRegisterInfo.cpp b/lib/Target/PowerPC/PPCRegisterInfo.cpp
index df245cc655..1d61a3a8ea 100644
--- a/lib/Target/PowerPC/PPCRegisterInfo.cpp
+++ b/lib/Target/PowerPC/PPCRegisterInfo.cpp
@@ -46,26 +46,8 @@
#define GET_REGINFO_TARGET_DESC
#include "PPCGenRegisterInfo.inc"
-namespace llvm {
-cl::opt<bool> DisablePPC32RS("disable-ppc32-regscavenger",
- cl::init(false),
- cl::desc("Disable PPC32 register scavenger"),
- cl::Hidden);
-cl::opt<bool> DisablePPC64RS("disable-ppc64-regscavenger",
- cl::init(false),
- cl::desc("Disable PPC64 register scavenger"),
- cl::Hidden);
-}
-
using namespace llvm;
-// FIXME (64-bit): Should be inlined.
-bool
-PPCRegisterInfo::requiresRegisterScavenging(const MachineFunction &) const {
- return ((!DisablePPC32RS && !Subtarget.isPPC64()) ||
- (!DisablePPC64RS && Subtarget.isPPC64()));
-}
-
PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
const TargetInstrInfo &tii)
: PPCGenRegisterInfo(ST.isPPC64() ? PPC::LR8 : PPC::LR,
@@ -86,20 +68,20 @@ PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
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;
-}
-
-bool
-PPCRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
- return requiresRegisterScavenging(MF);
+ ImmToIdxMap[PPC::ADDI8] = PPC::ADD8;
}
-
/// getPointerRegClass - Return the register class to use to hold pointers.
/// This is used for addressing modes.
const TargetRegisterClass *
PPCRegisterInfo::getPointerRegClass(const MachineFunction &MF, unsigned Kind)
const {
+ if (Kind == 1) {
+ if (Subtarget.isPPC64())
+ return &PPC::G8RC_NOX0RegClass;
+ return &PPC::GPRC_NOR0RegClass;
+ }
+
if (Subtarget.isPPC64())
return &PPC::G8RCRegClass;
return &PPC::GPRCRegClass;
@@ -123,12 +105,35 @@ PPCRegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
return Subtarget.isPPC64() ? CSR_SVR464_RegMask : CSR_SVR432_RegMask;
}
+const uint32_t*
+PPCRegisterInfo::getNoPreservedMask() const {
+ // The naming here is inverted: The CSR_NoRegs_Altivec has the
+ // Altivec registers masked so that they're not saved and restored around
+ // instructions with this preserved mask.
+
+ if (!Subtarget.hasAltivec())
+ return CSR_NoRegs_Altivec_RegMask;
+
+ if (Subtarget.isDarwin())
+ return CSR_NoRegs_Darwin_RegMask;
+ return CSR_NoRegs_RegMask;
+}
+
BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
const PPCFrameLowering *PPCFI =
static_cast<const PPCFrameLowering*>(MF.getTarget().getFrameLowering());
- Reserved.set(PPC::R0);
+ // The ZERO register is not really a register, but the representation of r0
+ // when used in instructions that treat r0 as the constant 0.
+ Reserved.set(PPC::ZERO);
+ Reserved.set(PPC::ZERO8);
+
+ // The FP register is also not really a register, but is the representation
+ // of the frame pointer register used by ISD::FRAMEADDR.
+ Reserved.set(PPC::FP);
+ Reserved.set(PPC::FP8);
+
Reserved.set(PPC::R1);
Reserved.set(PPC::LR);
Reserved.set(PPC::LR8);
@@ -139,35 +144,21 @@ BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
Reserved.set(PPC::R2); // System-reserved register
Reserved.set(PPC::R13); // Small Data Area pointer register
}
- // Reserve R2 on Darwin to hack around the problem of save/restore of CR
- // when the stack frame is too big to address directly; we need two regs.
- // This is a hack.
- if (Subtarget.isDarwinABI()) {
- 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);
- Reserved.set(PPC::X0);
Reserved.set(PPC::X1);
Reserved.set(PPC::X13);
- Reserved.set(PPC::X31);
+
+ if (PPCFI->needsFP(MF))
+ Reserved.set(PPC::X31);
// The 64-bit SVR4 ABI reserves r2 for the TOC pointer.
if (Subtarget.isSVR4ABI()) {
Reserved.set(PPC::X2);
}
- // Reserve X2 on Darwin to hack around the problem of save/restore of CR
- // when the stack frame is too big to address directly; we need two regs.
- // This is a hack.
- if (Subtarget.isDarwinABI()) {
- Reserved.set(PPC::X2);
- }
}
if (PPCFI->needsFP(MF))
@@ -185,6 +176,8 @@ PPCRegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
switch (RC->getID()) {
default:
return 0;
+ case PPC::G8RC_NOX0RegClassID:
+ case PPC::GPRC_NOR0RegClassID:
case PPC::G8RCRegClassID:
case PPC::GPRCRegClassID: {
unsigned FP = TFI->hasFP(MF) ? 1 : 0;
@@ -199,38 +192,10 @@ PPCRegisterInfo::getRegPressureLimit(const TargetRegisterClass *RC,
}
}
-bool
-PPCRegisterInfo::avoidWriteAfterWrite(const TargetRegisterClass *RC) const {
- switch (RC->getID()) {
- case PPC::G8RCRegClassID:
- case PPC::GPRCRegClassID:
- case PPC::F8RCRegClassID:
- case PPC::F4RCRegClassID:
- case PPC::VRRCRegClassID:
- return true;
- default:
- return false;
- }
-}
-
//===----------------------------------------------------------------------===//
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
-/// 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);
- // 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
///
@@ -238,8 +203,7 @@ unsigned findScratchRegister(MachineBasicBlock::iterator II, RegScavenger *RS,
/// 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 {
+void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II) const {
// Get the instruction.
MachineInstr &MI = *II;
// Get the instruction's basic block.
@@ -271,28 +235,16 @@ void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
// 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 (requiresRegisterScavenging(MF))
- Reg = findScratchRegister(II, RS, RC, SPAdj);
- else
- Reg = PPC::R0;
+ unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC);
if (MaxAlign < TargetAlign && isInt<16>(FrameSize)) {
BuildMI(MBB, II, dl, TII.get(PPC::ADDI), Reg)
.addReg(PPC::R31)
.addImm(FrameSize);
} else if (LP64) {
- if (requiresRegisterScavenging(MF)) // FIXME (64-bit): Use "true" part.
- BuildMI(MBB, II, dl, TII.get(PPC::LD), Reg)
- .addImm(0)
- .addReg(PPC::X1);
- else
- BuildMI(MBB, II, dl, TII.get(PPC::LD), PPC::X0)
- .addImm(0)
- .addReg(PPC::X1);
+ BuildMI(MBB, II, dl, TII.get(PPC::LD), Reg)
+ .addImm(0)
+ .addReg(PPC::X1);
} else {
BuildMI(MBB, II, dl, TII.get(PPC::LWZ), Reg)
.addImm(0)
@@ -302,17 +254,10 @@ void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
// Grow the stack and update the stack pointer link, then determine the
// address of new allocated space.
if (LP64) {
- if (requiresRegisterScavenging(MF)) // FIXME (64-bit): Use "true" part.
- BuildMI(MBB, II, dl, TII.get(PPC::STDUX), PPC::X1)
- .addReg(Reg, RegState::Kill)
- .addReg(PPC::X1)
- .addReg(MI.getOperand(1).getReg());
- else
- BuildMI(MBB, II, dl, TII.get(PPC::STDUX), PPC::X1)
- .addReg(PPC::X0, RegState::Kill)
- .addReg(PPC::X1)
- .addReg(MI.getOperand(1).getReg());
-
+ BuildMI(MBB, II, dl, TII.get(PPC::STDUX), PPC::X1)
+ .addReg(Reg, RegState::Kill)
+ .addReg(PPC::X1)
+ .addReg(MI.getOperand(1).getReg());
if (!MI.getOperand(1).isKill())
BuildMI(MBB, II, dl, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
.addReg(PPC::X1)
@@ -354,23 +299,19 @@ void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
/// stw rA, FI ; Store rA to the frame.
///
void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
- unsigned FrameIndex, int SPAdj,
- RegScavenger *RS) const {
+ unsigned FrameIndex) const {
// Get the instruction.
MachineInstr &MI = *II; // ; SPILL_CR <SrcReg>, <offset>
// Get the instruction's basic block.
MachineBasicBlock &MBB = *MI.getParent();
+ MachineFunction &MF = *MBB.getParent();
DebugLoc dl = MI.getDebugLoc();
- // FIXME: Once LLVM supports creating virtual registers here, or the register
- // scavenger can return multiple registers, stop using reserved registers
- // here.
- (void) SPAdj;
- (void) RS;
-
bool LP64 = Subtarget.isPPC64();
- unsigned Reg = Subtarget.isDarwinABI() ? (LP64 ? PPC::X2 : PPC::R2) :
- (LP64 ? PPC::X0 : PPC::R0);
+ const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+
+ unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC);
unsigned SrcReg = MI.getOperand(0).getReg();
// We need to store the CR in the low 4-bits of the saved value. First, issue
@@ -380,16 +321,20 @@ void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
// If the saved register wasn't CR0, shift the bits left so that they are in
// CR0's slot.
- if (SrcReg != PPC::CR0)
+ if (SrcReg != PPC::CR0) {
+ unsigned Reg1 = Reg;
+ Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC);
+
// rlwinm rA, rA, ShiftBits, 0, 31.
BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWINM8 : PPC::RLWINM), Reg)
- .addReg(Reg, RegState::Kill)
- .addImm(getPPCRegisterNumbering(SrcReg) * 4)
+ .addReg(Reg1, RegState::Kill)
+ .addImm(getEncodingValue(SrcReg) * 4)
.addImm(0)
.addImm(31);
+ }
addFrameReference(BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::STW8 : PPC::STW))
- .addReg(Reg, getKillRegState(MI.getOperand(1).getImm())),
+ .addReg(Reg, RegState::Kill),
FrameIndex);
// Discard the pseudo instruction.
@@ -397,23 +342,19 @@ void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
}
void PPCRegisterInfo::lowerCRRestore(MachineBasicBlock::iterator II,
- unsigned FrameIndex, int SPAdj,
- RegScavenger *RS) const {
+ unsigned FrameIndex) const {
// Get the instruction.
MachineInstr &MI = *II; // ; <DestReg> = RESTORE_CR <offset>
// Get the instruction's basic block.
MachineBasicBlock &MBB = *MI.getParent();
+ MachineFunction &MF = *MBB.getParent();
DebugLoc dl = MI.getDebugLoc();
- // FIXME: Once LLVM supports creating virtual registers here, or the register
- // scavenger can return multiple registers, stop using reserved registers
- // here.
- (void) SPAdj;
- (void) RS;
-
bool LP64 = Subtarget.isPPC64();
- unsigned Reg = Subtarget.isDarwinABI() ? (LP64 ? PPC::X2 : PPC::R2) :
- (LP64 ? PPC::X0 : PPC::R0);
+ const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+
+ unsigned Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC);
unsigned DestReg = MI.getOperand(0).getReg();
assert(MI.definesRegister(DestReg) &&
"RESTORE_CR does not define its destination");
@@ -424,15 +365,67 @@ void PPCRegisterInfo::lowerCRRestore(MachineBasicBlock::iterator II,
// 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 = getPPCRegisterNumbering(DestReg)*4;
+ unsigned Reg1 = Reg;
+ Reg = MF.getRegInfo().createVirtualRegister(LP64 ? G8RC : GPRC);
+
+ unsigned ShiftBits = getEncodingValue(DestReg)*4;
// rlwinm r11, r11, 32-ShiftBits, 0, 31.
BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::RLWINM8 : PPC::RLWINM), Reg)
- .addReg(Reg).addImm(32-ShiftBits).addImm(0)
+ .addReg(Reg1, RegState::Kill).addImm(32-ShiftBits).addImm(0)
.addImm(31);
}
BuildMI(MBB, II, dl, TII.get(LP64 ? PPC::MTCRF8 : PPC::MTCRF), DestReg)
- .addReg(Reg);
+ .addReg(Reg, RegState::Kill);
+
+ // Discard the pseudo instruction.
+ MBB.erase(II);
+}
+
+void PPCRegisterInfo::lowerVRSAVESpilling(MachineBasicBlock::iterator II,
+ unsigned FrameIndex) const {
+ // Get the instruction.
+ MachineInstr &MI = *II; // ; SPILL_VRSAVE <SrcReg>, <offset>
+ // Get the instruction's basic block.
+ MachineBasicBlock &MBB = *MI.getParent();
+ MachineFunction &MF = *MBB.getParent();
+ DebugLoc dl = MI.getDebugLoc();
+
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+ unsigned Reg = MF.getRegInfo().createVirtualRegister(GPRC);
+ unsigned SrcReg = MI.getOperand(0).getReg();
+
+ BuildMI(MBB, II, dl, TII.get(PPC::MFVRSAVEv), Reg)
+ .addReg(SrcReg, getKillRegState(MI.getOperand(0).isKill()));
+
+ addFrameReference(BuildMI(MBB, II, dl, TII.get(PPC::STW))
+ .addReg(Reg, RegState::Kill),
+ FrameIndex);
+
+ // Discard the pseudo instruction.
+ MBB.erase(II);
+}
+
+void PPCRegisterInfo::lowerVRSAVERestore(MachineBasicBlock::iterator II,
+ unsigned FrameIndex) const {
+ // Get the instruction.
+ MachineInstr &MI = *II; // ; <DestReg> = RESTORE_VRSAVE <offset>
+ // Get the instruction's basic block.
+ MachineBasicBlock &MBB = *MI.getParent();
+ MachineFunction &MF = *MBB.getParent();
+ DebugLoc dl = MI.getDebugLoc();
+
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+ unsigned Reg = MF.getRegInfo().createVirtualRegister(GPRC);
+ unsigned DestReg = MI.getOperand(0).getReg();
+ assert(MI.definesRegister(DestReg) &&
+ "RESTORE_VRSAVE does not define its destination");
+
+ addFrameReference(BuildMI(MBB, II, dl, TII.get(PPC::LWZ),
+ Reg), FrameIndex);
+
+ BuildMI(MBB, II, dl, TII.get(PPC::MTVRSAVEv), DestReg)
+ .addReg(Reg, RegState::Kill);
// Discard the pseudo instruction.
MBB.erase(II);
@@ -494,19 +487,23 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// Special case for dynamic alloca.
if (FPSI && FrameIndex == FPSI &&
(OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
- lowerDynamicAlloc(II, SPAdj, RS);
+ lowerDynamicAlloc(II);
return;
}
- // Special case for pseudo-ops SPILL_CR and RESTORE_CR.
- if (requiresRegisterScavenging(MF)) {
- if (OpC == PPC::SPILL_CR) {
- lowerCRSpilling(II, FrameIndex, SPAdj, RS);
- return;
- } else if (OpC == PPC::RESTORE_CR) {
- lowerCRRestore(II, FrameIndex, SPAdj, RS);
- return;
- }
+ // Special case for pseudo-ops SPILL_CR and RESTORE_CR, etc.
+ if (OpC == PPC::SPILL_CR) {
+ lowerCRSpilling(II, FrameIndex);
+ return;
+ } else if (OpC == PPC::RESTORE_CR) {
+ lowerCRRestore(II, FrameIndex);
+ return;
+ } else if (OpC == PPC::SPILL_VRSAVE) {
+ lowerVRSAVESpilling(II, FrameIndex);
+ return;
+ } else if (OpC == PPC::RESTORE_VRSAVE) {
+ lowerVRSAVERestore(II, FrameIndex);
+ return;
}
// Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
@@ -525,11 +522,14 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
case PPC::LWA:
case PPC::LD:
case PPC::STD:
- case PPC::STD_32:
isIXAddr = true;
break;
}
-
+
+ // If the instruction is not present in ImmToIdxMap, then it has no immediate
+ // form (and must be r+r).
+ bool noImmForm = !MI.isInlineAsm() && !ImmToIdxMap.count(OpC);
+
// Now add the frame object offset to the offset from r1.
int Offset = MFI->getObjectOffset(FrameIndex);
if (!isIXAddr)
@@ -553,7 +553,8 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// only "std" to a stack slot that is at least 4-byte aligned, but it can
// happen in invalid code.
if (OpC == PPC::DBG_VALUE || // DBG_VALUE is always Reg+Imm
- (isInt<16>(Offset) && (!isIXAddr || (Offset & 3) == 0))) {
+ (!noImmForm &&
+ isInt<16>(Offset) && (!isIXAddr || (Offset & 3) == 0))) {
if (isIXAddr)
Offset >>= 2; // The actual encoded value has the low two bits zero.
MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset);
@@ -563,19 +564,17 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// The offset doesn't fit into a single register, scavenge one to build the
// offset in.
- unsigned SReg;
- if (requiresRegisterScavenging(MF)) {
- const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
- const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
- SReg = findScratchRegister(II, RS, is64Bit ? G8RC : GPRC, SPAdj);
- } else
- SReg = is64Bit ? PPC::X0 : PPC::R0;
+ const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
+ const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
+ const TargetRegisterClass *RC = is64Bit ? G8RC : GPRC;
+ unsigned SRegHi = MF.getRegInfo().createVirtualRegister(RC),
+ SReg = MF.getRegInfo().createVirtualRegister(RC);
// Insert a set of rA with the full offset value before the ld, st, or add
- BuildMI(MBB, II, dl, TII.get(is64Bit ? PPC::LIS8 : PPC::LIS), SReg)
+ BuildMI(MBB, II, dl, TII.get(is64Bit ? PPC::LIS8 : PPC::LIS), SRegHi)
.addImm(Offset >> 16);
BuildMI(MBB, II, dl, TII.get(is64Bit ? PPC::ORI8 : PPC::ORI), SReg)
- .addReg(SReg, RegState::Kill)
+ .addReg(SRegHi, RegState::Kill)
.addImm(Offset);
// Convert into indexed form of the instruction:
@@ -584,7 +583,9 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
unsigned OperandBase;
- if (OpC != TargetOpcode::INLINEASM) {
+ if (noImmForm)
+ OperandBase = 1;
+ else if (OpC != TargetOpcode::INLINEASM) {
assert(ImmToIdxMap.count(OpC) &&
"No indexed form of load or store available!");
unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-24 17:13:48 +0000