#define DEBUG_TYPE "reginfo"
#include "PPCRegisterInfo.h"
#include "PPC.h"
+#include "PPCFrameLowering.h"
#include "PPCInstrBuilder.h"
#include "PPCMachineFunctionInfo.h"
-#include "PPCFrameLowering.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/ADT/BitVector.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/IR/CallingConv.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Type.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/STLExtras.h"
+#include "llvm/Target/TargetFrameLowering.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
#include <cstdlib>
#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,
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(unsigned Kind) const {
+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;
return Subtarget.isPPC64() ? CSR_SVR464_SaveList : CSR_SVR432_SaveList;
}
-const unsigned*
+const uint32_t*
PPCRegisterInfo::getCallPreservedMask(CallingConv::ID CC) const {
if (Subtarget.isDarwinABI())
return Subtarget.isPPC64() ? CSR_Darwin64_RegMask :
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);
+
+ // 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);
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))
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;
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
-void PPCRegisterInfo::
-eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I) const {
- if (MF.getTarget().Options.GuaranteedTailCallOpt &&
- 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;
- MachineInstr *MI = I;
- DebugLoc dl = MI->getDebugLoc();
-
- if (isInt<16>(CalleeAmt)) {
- BuildMI(MBB, I, dl, TII.get(ADDIInstr), StackReg)
- .addReg(StackReg, RegState::Kill)
- .addImm(CalleeAmt);
- } else {
- MachineBasicBlock::iterator MBBI = I;
- BuildMI(MBB, MBBI, dl, TII.get(LISInstr), TmpReg)
- .addImm(CalleeAmt >> 16);
- BuildMI(MBB, MBBI, dl, TII.get(ORIInstr), TmpReg)
- .addReg(TmpReg, RegState::Kill)
- .addImm(CalleeAmt & 0xFFFF);
- BuildMI(MBB, MBBI, dl, TII.get(ADDInstr), StackReg)
- .addReg(StackReg, RegState::Kill)
- .addReg(TmpReg);
- }
- }
- }
- // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
- MBB.erase(I);
-}
-
-/// 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
///
// 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)
// 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))
- .addReg(Reg, RegState::Kill)
- .addReg(PPC::X1, RegState::Define)
- .addReg(MI.getOperand(1).getReg());
- else
- BuildMI(MBB, II, dl, TII.get(PPC::STDUX))
- .addReg(PPC::X0, RegState::Kill)
- .addReg(PPC::X1, RegState::Define)
- .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)
.addImm(maxCallFrameSize)
.addReg(MI.getOperand(1).getReg(), RegState::ImplicitKill);
} else {
- BuildMI(MBB, II, dl, TII.get(PPC::STWUX))
+ BuildMI(MBB, II, dl, TII.get(PPC::STWUX), PPC::R1)
.addReg(Reg, RegState::Kill)
- .addReg(PPC::R1, RegState::Define)
+ .addReg(PPC::R1)
.addReg(MI.getOperand(1).getReg());
if (!MI.getOperand(1).isKill())
(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
(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");
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 {
+
+ // For the nonvolatile condition registers (CR2, CR3, CR4) in an SVR4
+ // ABI, return true to prevent allocating an additional frame slot.
+ // For 64-bit, the CR save area is at SP+8; the value of FrameIdx = 0
+ // is arbitrary and will be subsequently ignored. For 32-bit, we have
+ // previously created the stack slot if needed, so return its FrameIdx.
+ if (Subtarget.isSVR4ABI() && PPC::CR2 <= Reg && Reg <= PPC::CR4) {
+ if (Subtarget.isPPC64())
+ FrameIdx = 0;
+ else {
+ const PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
+ FrameIdx = FI->getCRSpillFrameIndex();
+ }
+ return true;
+ }
+ return false;
+}
+
void
PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const {
+ int SPAdj, unsigned FIOperandNum,
+ RegScavenger *RS) const {
assert(SPAdj == 0 && "Unexpected");
// Get the instruction.
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
DebugLoc dl = MI.getDebugLoc();
- // 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 OffsetOperandNo = (FIOperandNo == 2) ? 1 : 2;
+ unsigned OffsetOperandNo = (FIOperandNum == 2) ? 1 : 2;
if (MI.isInlineAsm())
- OffsetOperandNo = FIOperandNo-1;
+ OffsetOperandNo = FIOperandNum-1;
// Get the frame index.
- int FrameIndex = MI.getOperand(FIOperandNo).getIndex();
+ int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
// Get the frame pointer save index. Users of this index are primarily
// DYNALLOC instructions.
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).
bool is64Bit = Subtarget.isPPC64();
- MI.getOperand(FIOperandNo).ChangeToRegister(TFI->hasFP(MF) ?
+ MI.getOperand(FIOperandNum).ChangeToRegister(TFI->hasFP(MF) ?
(is64Bit ? PPC::X31 : PPC::R31) :
(is64Bit ? PPC::X1 : PPC::R1),
false);
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)
// to Offset to get the correct offset.
// Naked functions have stack size 0, although getStackSize may not reflect that
// because we didn't call all the pieces that compute it for naked functions.
- if (!MF.getFunction()->hasFnAttr(Attribute::Naked))
+ if (!MF.getFunction()->getAttributes().
+ hasAttribute(AttributeSet::FunctionIndex, Attribute::Naked))
Offset += MFI->getStackSize();
// If we can, encode the offset directly into the instruction. If this is a
// 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);
// 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)
// 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;
OperandBase = OffsetOperandNo;
}
- unsigned StackReg = MI.getOperand(FIOperandNo).getReg();
+ unsigned StackReg = MI.getOperand(FIOperandNum).getReg();
MI.getOperand(OperandBase).ChangeToRegister(StackReg, false);
MI.getOperand(OperandBase + 1).ChangeToRegister(SReg, false, false, true);
}
projects / oota-llvm.git / blobdiff