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llvm-6502/lib/Target/Hexagon/HexagonRegisterInfo.cpp
Eric Christopher 6035518e3b Have MachineFunction cache a pointer to the subtarget to make lookups 
shorter/easier and have the DAG use that to do the same lookup. This
can be used in the future for TargetMachine based caching lookups from
the MachineFunction easily.

Update the MIPS subtarget switching machinery to update this pointer
at the same time it runs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214838 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-05 02:39:49 +00:00

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//===-- HexagonRegisterInfo.cpp - Hexagon Register Information ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the Hexagon implementation of the TargetRegisterInfo
// class.
//
//===----------------------------------------------------------------------===//
#include "HexagonRegisterInfo.h"
#include "Hexagon.h"
#include "HexagonMachineFunctionInfo.h"
#include "HexagonSubtarget.h"
#include "HexagonTargetMachine.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Type.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
HexagonRegisterInfo::HexagonRegisterInfo(HexagonSubtarget &st)
: HexagonGenRegisterInfo(Hexagon::R31),
Subtarget(st) {
}
const MCPhysReg *
HexagonRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
static const MCPhysReg CalleeSavedRegsV2[] = {
Hexagon::R24, Hexagon::R25, Hexagon::R26, Hexagon::R27, 0
};
static const MCPhysReg CalleeSavedRegsV3[] = {
Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23,
Hexagon::R24, Hexagon::R25, Hexagon::R26, Hexagon::R27, 0
};
switch(Subtarget.getHexagonArchVersion()) {
case HexagonSubtarget::V1:
break;
case HexagonSubtarget::V2:
return CalleeSavedRegsV2;
case HexagonSubtarget::V3:
case HexagonSubtarget::V4:
case HexagonSubtarget::V5:
return CalleeSavedRegsV3;
}
llvm_unreachable("Callee saved registers requested for unknown architecture "
"version");
}
BitVector HexagonRegisterInfo::getReservedRegs(const MachineFunction &MF)
const {
BitVector Reserved(getNumRegs());
Reserved.set(HEXAGON_RESERVED_REG_1);
Reserved.set(HEXAGON_RESERVED_REG_2);
Reserved.set(Hexagon::R29);
Reserved.set(Hexagon::R30);
Reserved.set(Hexagon::R31);
Reserved.set(Hexagon::D14);
Reserved.set(Hexagon::D15);
Reserved.set(Hexagon::LC0);
Reserved.set(Hexagon::LC1);
Reserved.set(Hexagon::SA0);
Reserved.set(Hexagon::SA1);
return Reserved;
}
const TargetRegisterClass* const*
HexagonRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
static const TargetRegisterClass * const CalleeSavedRegClassesV2[] = {
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
};
static const TargetRegisterClass * const CalleeSavedRegClassesV3[] = {
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
&Hexagon::IntRegsRegClass, &Hexagon::IntRegsRegClass,
};
switch(Subtarget.getHexagonArchVersion()) {
case HexagonSubtarget::V1:
break;
case HexagonSubtarget::V2:
return CalleeSavedRegClassesV2;
case HexagonSubtarget::V3:
case HexagonSubtarget::V4:
case HexagonSubtarget::V5:
return CalleeSavedRegClassesV3;
}
llvm_unreachable("Callee saved register classes requested for unknown "
"architecture version");
}
void HexagonRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
int SPAdj, unsigned FIOperandNum,
RegScavenger *RS) const {
//
// Hexagon_TODO: Do we need to enforce this for Hexagon?
assert(SPAdj == 0 && "Unexpected");
MachineInstr &MI = *II;
int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
// Addressable stack objects are accessed using neg. offsets from %fp.
MachineFunction &MF = *MI.getParent()->getParent();
const HexagonInstrInfo &TII =
*static_cast<const HexagonInstrInfo *>(MF.getSubtarget().getInstrInfo());
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
MachineFrameInfo &MFI = *MF.getFrameInfo();
unsigned FrameReg = getFrameRegister(MF);
const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
if (!TFI->hasFP(MF)) {
// We will not reserve space on the stack for the lr and fp registers.
Offset -= 2 * Hexagon_WordSize;
}
const unsigned FrameSize = MFI.getStackSize();
if (!MFI.hasVarSizedObjects() &&
TII.isValidOffset(MI.getOpcode(), (FrameSize+Offset)) &&
!TII.isSpillPredRegOp(&MI)) {
// Replace frame index with a stack pointer reference.
MI.getOperand(FIOperandNum).ChangeToRegister(getStackRegister(), false,
false, true);
MI.getOperand(FIOperandNum + 1).ChangeToImmediate(FrameSize+Offset);
} else {
// Replace frame index with a frame pointer reference.
if (!TII.isValidOffset(MI.getOpcode(), Offset)) {
// If the offset overflows, then correct it.
//
// For loads, we do not need a reserved register
// r0 = memw(r30 + #10000) to:
//
// r0 = add(r30, #10000)
// r0 = memw(r0)
if ( (MI.getOpcode() == Hexagon::LDriw) ||
(MI.getOpcode() == Hexagon::LDrid) ||
(MI.getOpcode() == Hexagon::LDrih) ||
(MI.getOpcode() == Hexagon::LDriuh) ||
(MI.getOpcode() == Hexagon::LDrib) ||
(MI.getOpcode() == Hexagon::LDriub) ||
(MI.getOpcode() == Hexagon::LDriw_f) ||
(MI.getOpcode() == Hexagon::LDrid_f)) {
unsigned dstReg = (MI.getOpcode() == Hexagon::LDrid) ?
getSubReg(MI.getOperand(0).getReg(), Hexagon::subreg_loreg) :
MI.getOperand(0).getReg();
// Check if offset can fit in addi.
if (!TII.isValidOffset(Hexagon::ADD_ri, Offset)) {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::CONST32_Int_Real), dstReg).addImm(Offset);
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::ADD_rr),
dstReg).addReg(FrameReg).addReg(dstReg);
} else {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::ADD_ri),
dstReg).addReg(FrameReg).addImm(Offset);
}
MI.getOperand(FIOperandNum).ChangeToRegister(dstReg, false, false,true);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(0);
} else if ((MI.getOpcode() == Hexagon::STriw_indexed) ||
(MI.getOpcode() == Hexagon::STriw) ||
(MI.getOpcode() == Hexagon::STrid) ||
(MI.getOpcode() == Hexagon::STrih) ||
(MI.getOpcode() == Hexagon::STrib) ||
(MI.getOpcode() == Hexagon::STrid_f) ||
(MI.getOpcode() == Hexagon::STriw_f)) {
// For stores, we need a reserved register. Change
// memw(r30 + #10000) = r0 to:
//
// rs = add(r30, #10000);
// memw(rs) = r0
unsigned resReg = HEXAGON_RESERVED_REG_1;
// Check if offset can fit in addi.
if (!TII.isValidOffset(Hexagon::ADD_ri, Offset)) {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::CONST32_Int_Real), resReg).addImm(Offset);
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::ADD_rr),
resReg).addReg(FrameReg).addReg(resReg);
} else {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::ADD_ri),
resReg).addReg(FrameReg).addImm(Offset);
}
MI.getOperand(FIOperandNum).ChangeToRegister(resReg, false, false,true);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(0);
} else if (TII.isMemOp(&MI)) {
// use the constant extender if the instruction provides it
// and we are V4TOps.
if (Subtarget.hasV4TOps()) {
if (TII.isConstExtended(&MI)) {
MI.getOperand(FIOperandNum).ChangeToRegister(FrameReg, false);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(Offset);
TII.immediateExtend(&MI);
} else {
llvm_unreachable("Need to implement for memops");
}
} else {
// Only V3 and older instructions here.
unsigned ResReg = HEXAGON_RESERVED_REG_1;
if (!MFI.hasVarSizedObjects() &&
TII.isValidOffset(MI.getOpcode(), (FrameSize+Offset))) {
MI.getOperand(FIOperandNum).ChangeToRegister(getStackRegister(),
false, false, false);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(FrameSize+Offset);
} else if (!TII.isValidOffset(Hexagon::ADD_ri, Offset)) {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::CONST32_Int_Real), ResReg).addImm(Offset);
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::ADD_rr), ResReg).addReg(FrameReg).
addReg(ResReg);
MI.getOperand(FIOperandNum).ChangeToRegister(ResReg, false, false,
true);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(0);
} else {
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::ADD_ri), ResReg).addReg(FrameReg).
addImm(Offset);
MI.getOperand(FIOperandNum).ChangeToRegister(ResReg, false, false,
true);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(0);
}
}
} else {
unsigned dstReg = MI.getOperand(0).getReg();
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::CONST32_Int_Real), dstReg).addImm(Offset);
BuildMI(*MI.getParent(), II, MI.getDebugLoc(),
TII.get(Hexagon::ADD_rr),
dstReg).addReg(FrameReg).addReg(dstReg);
// Can we delete MI??? r2 = add (r2, #0).
MI.getOperand(FIOperandNum).ChangeToRegister(dstReg, false, false,true);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(0);
}
} else {
// If the offset is small enough to fit in the immediate field, directly
// encode it.
MI.getOperand(FIOperandNum).ChangeToRegister(FrameReg, false);
MI.getOperand(FIOperandNum+1).ChangeToImmediate(Offset);
}
}
}
unsigned HexagonRegisterInfo::getRARegister() const {
return Hexagon::R31;
}
unsigned HexagonRegisterInfo::getFrameRegister(const MachineFunction
&MF) const {
const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
if (TFI->hasFP(MF)) {
return Hexagon::R30;
}
return Hexagon::R29;
}
unsigned HexagonRegisterInfo::getFrameRegister() const {
return Hexagon::R30;
}
unsigned HexagonRegisterInfo::getStackRegister() const {
return Hexagon::R29;
}
#define GET_REGINFO_TARGET_DESC
#include "HexagonGenRegisterInfo.inc"
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