#include "XCoreRegisterInfo.h"
#include "XCore.h"
+#include "XCoreInstrInfo.h"
#include "XCoreMachineFunctionInfo.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
+using namespace llvm;
+
+#define DEBUG_TYPE "xcore-reg-info"
+
#define GET_REGINFO_TARGET_DESC
#include "XCoreGenRegisterInfo.inc"
-using namespace llvm;
-
-XCoreRegisterInfo::XCoreRegisterInfo(const TargetInstrInfo &tii)
- : XCoreGenRegisterInfo(XCore::LR), TII(tii) {
+XCoreRegisterInfo::XCoreRegisterInfo()
+ : XCoreGenRegisterInfo(XCore::LR) {
}
// helper functions
return val < (1 << 16);
}
+
+static void InsertFPImmInst(MachineBasicBlock::iterator II,
+ const XCoreInstrInfo &TII,
+ unsigned Reg, unsigned FrameReg, int Offset ) {
+ MachineInstr &MI = *II;
+ MachineBasicBlock &MBB = *MI.getParent();
+ DebugLoc dl = MI.getDebugLoc();
+
+ switch (MI.getOpcode()) {
+ case XCore::LDWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::LDW_2rus), Reg)
+ .addReg(FrameReg)
+ .addImm(Offset)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::STWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::STW_2rus))
+ .addReg(Reg, getKillRegState(MI.getOperand(0).isKill()))
+ .addReg(FrameReg)
+ .addImm(Offset)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::LDAWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::LDAWF_l2rus), Reg)
+ .addReg(FrameReg)
+ .addImm(Offset);
+ break;
+ default:
+ llvm_unreachable("Unexpected Opcode");
+ }
+}
+
+static void InsertFPConstInst(MachineBasicBlock::iterator II,
+ const XCoreInstrInfo &TII,
+ unsigned Reg, unsigned FrameReg,
+ int Offset, RegScavenger *RS ) {
+ assert(RS && "requiresRegisterScavenging failed");
+ MachineInstr &MI = *II;
+ MachineBasicBlock &MBB = *MI.getParent();
+ DebugLoc dl = MI.getDebugLoc();
+ unsigned ScratchOffset = RS->scavengeRegister(&XCore::GRRegsRegClass, II, 0);
+ RS->setUsed(ScratchOffset);
+ TII.loadImmediate(MBB, II, ScratchOffset, Offset);
+
+ switch (MI.getOpcode()) {
+ case XCore::LDWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::LDW_3r), Reg)
+ .addReg(FrameReg)
+ .addReg(ScratchOffset, RegState::Kill)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::STWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::STW_l3r))
+ .addReg(Reg, getKillRegState(MI.getOperand(0).isKill()))
+ .addReg(FrameReg)
+ .addReg(ScratchOffset, RegState::Kill)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::LDAWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::LDAWF_l3r), Reg)
+ .addReg(FrameReg)
+ .addReg(ScratchOffset, RegState::Kill);
+ break;
+ default:
+ llvm_unreachable("Unexpected Opcode");
+ }
+}
+
+static void InsertSPImmInst(MachineBasicBlock::iterator II,
+ const XCoreInstrInfo &TII,
+ unsigned Reg, int Offset) {
+ MachineInstr &MI = *II;
+ MachineBasicBlock &MBB = *MI.getParent();
+ DebugLoc dl = MI.getDebugLoc();
+ bool isU6 = isImmU6(Offset);
+
+ switch (MI.getOpcode()) {
+ int NewOpcode;
+ case XCore::LDWFI:
+ NewOpcode = (isU6) ? XCore::LDWSP_ru6 : XCore::LDWSP_lru6;
+ BuildMI(MBB, II, dl, TII.get(NewOpcode), Reg)
+ .addImm(Offset)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::STWFI:
+ NewOpcode = (isU6) ? XCore::STWSP_ru6 : XCore::STWSP_lru6;
+ BuildMI(MBB, II, dl, TII.get(NewOpcode))
+ .addReg(Reg, getKillRegState(MI.getOperand(0).isKill()))
+ .addImm(Offset)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::LDAWFI:
+ NewOpcode = (isU6) ? XCore::LDAWSP_ru6 : XCore::LDAWSP_lru6;
+ BuildMI(MBB, II, dl, TII.get(NewOpcode), Reg)
+ .addImm(Offset);
+ break;
+ default:
+ llvm_unreachable("Unexpected Opcode");
+ }
+}
+
+static void InsertSPConstInst(MachineBasicBlock::iterator II,
+ const XCoreInstrInfo &TII,
+ unsigned Reg, int Offset, RegScavenger *RS ) {
+ assert(RS && "requiresRegisterScavenging failed");
+ MachineInstr &MI = *II;
+ MachineBasicBlock &MBB = *MI.getParent();
+ DebugLoc dl = MI.getDebugLoc();
+ unsigned OpCode = MI.getOpcode();
+
+ unsigned ScratchBase;
+ if (OpCode==XCore::STWFI) {
+ ScratchBase = RS->scavengeRegister(&XCore::GRRegsRegClass, II, 0);
+ RS->setUsed(ScratchBase);
+ } else
+ ScratchBase = Reg;
+ BuildMI(MBB, II, dl, TII.get(XCore::LDAWSP_ru6), ScratchBase).addImm(0);
+ unsigned ScratchOffset = RS->scavengeRegister(&XCore::GRRegsRegClass, II, 0);
+ RS->setUsed(ScratchOffset);
+ TII.loadImmediate(MBB, II, ScratchOffset, Offset);
+
+ switch (OpCode) {
+ case XCore::LDWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::LDW_3r), Reg)
+ .addReg(ScratchBase, RegState::Kill)
+ .addReg(ScratchOffset, RegState::Kill)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::STWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::STW_l3r))
+ .addReg(Reg, getKillRegState(MI.getOperand(0).isKill()))
+ .addReg(ScratchBase, RegState::Kill)
+ .addReg(ScratchOffset, RegState::Kill)
+ .addMemOperand(*MI.memoperands_begin());
+ break;
+ case XCore::LDAWFI:
+ BuildMI(MBB, II, dl, TII.get(XCore::LDAWF_l3r), Reg)
+ .addReg(ScratchBase, RegState::Kill)
+ .addReg(ScratchOffset, RegState::Kill);
+ break;
+ default:
+ llvm_unreachable("Unexpected Opcode");
+ }
+}
+
bool XCoreRegisterInfo::needsFrameMoves(const MachineFunction &MF) {
return MF.getMMI().hasDebugInfo() ||
MF.getFunction()->needsUnwindTableEntry();
}
-const uint16_t* XCoreRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
+const MCPhysReg* XCoreRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
const {
- static const uint16_t CalleeSavedRegs[] = {
+ // The callee saved registers LR & FP are explicitly handled during
+ // emitPrologue & emitEpilogue and related functions.
+ static const MCPhysReg CalleeSavedRegs[] = {
+ XCore::R4, XCore::R5, XCore::R6, XCore::R7,
+ XCore::R8, XCore::R9, XCore::R10,
+ 0
+ };
+ static const MCPhysReg CalleeSavedRegsFP[] = {
XCore::R4, XCore::R5, XCore::R6, XCore::R7,
- XCore::R8, XCore::R9, XCore::R10, XCore::LR,
+ XCore::R8, XCore::R9,
0
};
+ const TargetFrameLowering *TFI = MF->getTarget().getFrameLowering();
+ if (TFI->hasFP(*MF))
+ return CalleeSavedRegsFP;
return CalleeSavedRegs;
}
bool
XCoreRegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const {
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
-
- // TODO can we estimate stack size?
- return TFI->hasFP(MF);
+ return true;
}
bool
XCoreRegisterInfo::trackLivenessAfterRegAlloc(const MachineFunction &MF) const {
- return requiresRegisterScavenging(MF);
+ return true;
}
bool
RegScavenger *RS) const {
assert(SPAdj == 0 && "Unexpected");
MachineInstr &MI = *II;
- DebugLoc dl = MI.getDebugLoc();
MachineOperand &FrameOp = MI.getOperand(FIOperandNum);
int FrameIndex = FrameOp.getIndex();
MachineFunction &MF = *MI.getParent()->getParent();
+ const XCoreInstrInfo &TII =
+ *static_cast<const XCoreInstrInfo*>(MF.getTarget().getInstrInfo());
+
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
int StackSize = MF.getFrameInfo()->getStackSize();
MI.getOperand(FIOperandNum + 1).ChangeToImmediate(0);
assert(Offset%4 == 0 && "Misaligned stack offset");
-
DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
-
Offset/=4;
- bool FP = TFI->hasFP(MF);
-
unsigned Reg = MI.getOperand(0).getReg();
- bool isKill = MI.getOpcode() == XCore::STWFI && MI.getOperand(0).isKill();
-
assert(XCore::GRRegsRegClass.contains(Reg) && "Unexpected register operand");
-
- MachineBasicBlock &MBB = *MI.getParent();
-
- if (FP) {
- bool isUs = isImmUs(Offset);
-
- if (!isUs) {
- if (!RS)
- report_fatal_error("eliminateFrameIndex Frame size too big: " +
- Twine(Offset));
- unsigned ScratchReg = RS->scavengeRegister(&XCore::GRRegsRegClass, II,
- SPAdj);
- loadConstant(MBB, II, ScratchReg, Offset, dl);
- switch (MI.getOpcode()) {
- case XCore::LDWFI:
- BuildMI(MBB, II, dl, TII.get(XCore::LDW_3r), Reg)
- .addReg(FrameReg)
- .addReg(ScratchReg, RegState::Kill);
- break;
- case XCore::STWFI:
- BuildMI(MBB, II, dl, TII.get(XCore::STW_l3r))
- .addReg(Reg, getKillRegState(isKill))
- .addReg(FrameReg)
- .addReg(ScratchReg, RegState::Kill);
- break;
- case XCore::LDAWFI:
- BuildMI(MBB, II, dl, TII.get(XCore::LDAWF_l3r), Reg)
- .addReg(FrameReg)
- .addReg(ScratchReg, RegState::Kill);
- break;
- default:
- llvm_unreachable("Unexpected Opcode");
- }
- } else {
- switch (MI.getOpcode()) {
- case XCore::LDWFI:
- BuildMI(MBB, II, dl, TII.get(XCore::LDW_2rus), Reg)
- .addReg(FrameReg)
- .addImm(Offset);
- break;
- case XCore::STWFI:
- BuildMI(MBB, II, dl, TII.get(XCore::STW_2rus))
- .addReg(Reg, getKillRegState(isKill))
- .addReg(FrameReg)
- .addImm(Offset);
- break;
- case XCore::LDAWFI:
- BuildMI(MBB, II, dl, TII.get(XCore::LDAWF_l2rus), Reg)
- .addReg(FrameReg)
- .addImm(Offset);
- break;
- default:
- llvm_unreachable("Unexpected Opcode");
- }
- }
+
+ if (TFI->hasFP(MF)) {
+ if (isImmUs(Offset))
+ InsertFPImmInst(II, TII, Reg, FrameReg, Offset);
+ else
+ InsertFPConstInst(II, TII, Reg, FrameReg, Offset, RS);
} else {
- bool isU6 = isImmU6(Offset);
- if (!isU6 && !isImmU16(Offset))
- report_fatal_error("eliminateFrameIndex Frame size too big: " +
- Twine(Offset));
-
- switch (MI.getOpcode()) {
- int NewOpcode;
- case XCore::LDWFI:
- NewOpcode = (isU6) ? XCore::LDWSP_ru6 : XCore::LDWSP_lru6;
- BuildMI(MBB, II, dl, TII.get(NewOpcode), Reg)
- .addImm(Offset);
- break;
- case XCore::STWFI:
- NewOpcode = (isU6) ? XCore::STWSP_ru6 : XCore::STWSP_lru6;
- BuildMI(MBB, II, dl, TII.get(NewOpcode))
- .addReg(Reg, getKillRegState(isKill))
- .addImm(Offset);
- break;
- case XCore::LDAWFI:
- NewOpcode = (isU6) ? XCore::LDAWSP_ru6 : XCore::LDAWSP_lru6;
- BuildMI(MBB, II, dl, TII.get(NewOpcode), Reg)
- .addImm(Offset);
- break;
- default:
- llvm_unreachable("Unexpected Opcode");
- }
+ if (isImmU16(Offset))
+ InsertSPImmInst(II, TII, Reg, Offset);
+ else
+ InsertSPConstInst(II, TII, Reg, Offset, RS);
}
// Erase old instruction.
+ MachineBasicBlock &MBB = *MI.getParent();
MBB.erase(II);
}
-void XCoreRegisterInfo::
-loadConstant(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
- unsigned DstReg, int64_t Value, DebugLoc dl) const {
- // TODO use mkmsk if possible.
- if (!isImmU16(Value)) {
- // TODO use constant pool.
- report_fatal_error("loadConstant value too big " + Twine(Value));
- }
- int Opcode = isImmU6(Value) ? XCore::LDC_ru6 : XCore::LDC_lru6;
- BuildMI(MBB, I, dl, TII.get(Opcode), DstReg).addImm(Value);
-}
unsigned XCoreRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
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