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Diffstat (limited to 'lib/Target/PowerPC/PPCRegisterInfo.cpp')
-rw-r--r--lib/Target/PowerPC/PPCRegisterInfo.cpp260
1 files changed, 142 insertions, 118 deletions
diff --git a/lib/Target/PowerPC/PPCRegisterInfo.cpp b/lib/Target/PowerPC/PPCRegisterInfo.cpp
index df245cc655..75e20e4a26 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,
@@ -89,17 +71,17 @@ PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; ImmToIdxMap[PPC::STD_32] = PPC::STDX_32;
}
-bool
-PPCRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
- return requiresRegisterScavenging(MF);
-}
-
-
/// 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;
@@ -123,11 +105,33 @@ 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;
+
+ return CSR_NoRegs_RegMask;
+}
+
BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
const PPCFrameLowering *PPCFI =
static_cast<const PPCFrameLowering*>(MF.getTarget().getFrameLowering());
+ // 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::R0);
Reserved.set(PPC::R1);
Reserved.set(PPC::LR);
@@ -139,35 +143,22 @@ 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
///
@@ -271,28 +236,16 @@ 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 +255,10 @@ 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)
@@ -369,8 +315,7 @@ void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
(void) RS;
bool LP64 = Subtarget.isPPC64();
- unsigned Reg = Subtarget.isDarwinABI() ? (LP64 ? PPC::X2 : PPC::R2) :
- (LP64 ? PPC::X0 : PPC::R0);
+ unsigned Reg = LP64 ? PPC::X0 : PPC::R0;
unsigned SrcReg = MI.getOperand(0).getReg();
// We need to store the CR in the low 4-bits of the saved value. First, issue
@@ -412,8 +357,7 @@ void PPCRegisterInfo::lowerCRRestore(MachineBasicBlock::iterator II,
(void) RS;
bool LP64 = Subtarget.isPPC64();
- unsigned Reg = Subtarget.isDarwinABI() ? (LP64 ? PPC::X2 : PPC::R2) :
- (LP64 ? PPC::X0 : PPC::R0);
+ unsigned Reg = LP64 ? PPC::X0 : PPC::R0;
unsigned DestReg = MI.getOperand(0).getReg();
assert(MI.definesRegister(DestReg) &&
"RESTORE_CR does not define its destination");
@@ -438,6 +382,65 @@ void PPCRegisterInfo::lowerCRRestore(MachineBasicBlock::iterator II,
MBB.erase(II);
}
+void PPCRegisterInfo::lowerVRSAVESpilling(MachineBasicBlock::iterator II,
+ unsigned FrameIndex, int SPAdj,
+ RegScavenger *RS) const {
+ // Get the instruction.
+ MachineInstr &MI = *II; // ; SPILL_VRSAVE <SrcReg>, <offset>
+ // Get the instruction's basic block.
+ MachineBasicBlock &MBB = *MI.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;
+
+ unsigned Reg = PPC::R0;
+ 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, getKillRegState(MI.getOperand(1).getImm())),
+ FrameIndex);
+
+ // Discard the pseudo instruction.
+ MBB.erase(II);
+}
+
+void PPCRegisterInfo::lowerVRSAVERestore(MachineBasicBlock::iterator II,
+ unsigned FrameIndex, int SPAdj,
+ RegScavenger *RS) const {
+ // Get the instruction.
+ MachineInstr &MI = *II; // ; <DestReg> = RESTORE_VRSAVE <offset>
+ // Get the instruction's basic block.
+ MachineBasicBlock &MBB = *MI.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;
+
+ unsigned Reg = PPC::R0;
+ 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);
+
+ // Discard the pseudo instruction.
+ MBB.erase(II);
+}
+
bool
PPCRegisterInfo::hasReservedSpillSlot(const MachineFunction &MF,
unsigned Reg, int &FrameIdx) const {
@@ -498,15 +501,19 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator 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, SPAdj, RS);
+ return;
+ } else if (OpC == PPC::RESTORE_CR) {
+ lowerCRRestore(II, FrameIndex, SPAdj, RS);
+ return;
+ } else if (OpC == PPC::SPILL_VRSAVE) {
+ lowerVRSAVESpilling(II, FrameIndex, SPAdj, RS);
+ return;
+ } else if (OpC == PPC::RESTORE_VRSAVE) {
+ lowerVRSAVERestore(II, FrameIndex, SPAdj, RS);
+ return;
}
// Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
@@ -529,7 +536,25 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
isIXAddr = true;
break;
}
-
+
+ bool noImmForm = false;
+ switch (OpC) {
+ case PPC::LVEBX:
+ case PPC::LVEHX:
+ case PPC::LVEWX:
+ case PPC::LVX:
+ case PPC::LVXL:
+ case PPC::LVSL:
+ case PPC::LVSR:
+ case PPC::STVEBX:
+ case PPC::STVEHX:
+ case PPC::STVEWX:
+ case PPC::STVX:
+ case PPC::STVXL:
+ noImmForm = true;
+ break;
+ }
+
// Now add the frame object offset to the offset from r1.
int Offset = MFI->getObjectOffset(FrameIndex);
if (!isIXAddr)
@@ -553,7 +578,8 @@ 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);
@@ -563,13 +589,9 @@ 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;
+ unsigned SReg = MF.getRegInfo().createVirtualRegister(is64Bit ? G8RC : GPRC);
// 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)
@@ -584,7 +606,9 @@ 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 v1.2.3-18-g5258 (git 2.32.0) at 2025-08-17 21:59:36 +0000