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llvm-6502/lib/Target/IA64/IA64RegisterInfo.cpp
Anton Korobeynikov f191c80cd7 Use TableGen to emit information for dwarf register numbers. 
This makes DwarfRegNum to accept list of numbers instead.
Added three different "flavours", but only slightly tested on x86-32/linux.
Please check another subtargets if possible,


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43997 91177308-0d34-0410-b5e6-96231b3b80d8
2007-11-11 19:50:10 +00:00

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//===- IA64RegisterInfo.cpp - IA64 Register Information ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Duraid Madina and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the IA64 implementation of the MRegisterInfo class. This
// file is responsible for the frame pointer elimination optimization on IA64.
//
//===----------------------------------------------------------------------===//
#include "IA64.h"
#include "IA64RegisterInfo.h"
#include "IA64InstrBuilder.h"
#include "IA64MachineFunctionInfo.h"
#include "llvm/Constants.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineLocation.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
using namespace llvm;
IA64RegisterInfo::IA64RegisterInfo(const TargetInstrInfo &tii)
: IA64GenRegisterInfo(IA64::ADJUSTCALLSTACKDOWN, IA64::ADJUSTCALLSTACKUP),
TII(tii) {}
void IA64RegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, int FrameIdx,
const TargetRegisterClass *RC) const{
if (RC == IA64::FPRegisterClass) {
BuildMI(MBB, MI, TII.get(IA64::STF_SPILL)).addFrameIndex(FrameIdx)
.addReg(SrcReg, false, false, true);
} else if (RC == IA64::GRRegisterClass) {
BuildMI(MBB, MI, TII.get(IA64::ST8)).addFrameIndex(FrameIdx)
.addReg(SrcReg, false, false, true);
} else if (RC == IA64::PRRegisterClass) {
/* we use IA64::r2 as a temporary register for doing this hackery. */
// first we load 0:
BuildMI(MBB, MI, TII.get(IA64::MOV), IA64::r2).addReg(IA64::r0);
// then conditionally add 1:
BuildMI(MBB, MI, TII.get(IA64::CADDIMM22), IA64::r2).addReg(IA64::r2)
.addImm(1).addReg(SrcReg, false, false, true);
// and then store it to the stack
BuildMI(MBB, MI, TII.get(IA64::ST8)).addFrameIndex(FrameIdx).addReg(IA64::r2);
} else assert(0 &&
"sorry, I don't know how to store this sort of reg in the stack\n");
}
void IA64RegisterInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs) const {
unsigned Opc = 0;
if (RC == IA64::FPRegisterClass) {
Opc = IA64::STF8;
} else if (RC == IA64::GRRegisterClass) {
Opc = IA64::ST8;
} else if (RC == IA64::PRRegisterClass) {
Opc = IA64::ST1;
} else {
assert(0 &&
"sorry, I don't know how to store this sort of reg\n");
}
MachineInstrBuilder MIB = BuildMI(TII.get(Opc));
for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
MachineOperand &MO = Addr[i];
if (MO.isRegister())
MIB.addReg(MO.getReg());
else if (MO.isImmediate())
MIB.addImm(MO.getImmedValue());
else
MIB.addFrameIndex(MO.getFrameIndex());
}
MIB.addReg(SrcReg, false, false, true);
NewMIs.push_back(MIB);
return;
}
void IA64RegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC)const{
if (RC == IA64::FPRegisterClass) {
BuildMI(MBB, MI, TII.get(IA64::LDF_FILL), DestReg).addFrameIndex(FrameIdx);
} else if (RC == IA64::GRRegisterClass) {
BuildMI(MBB, MI, TII.get(IA64::LD8), DestReg).addFrameIndex(FrameIdx);
} else if (RC == IA64::PRRegisterClass) {
// first we load a byte from the stack into r2, our 'predicate hackery'
// scratch reg
BuildMI(MBB, MI, TII.get(IA64::LD8), IA64::r2).addFrameIndex(FrameIdx);
// then we compare it to zero. If it _is_ zero, compare-not-equal to
// r0 gives us 0, which is what we want, so that's nice.
BuildMI(MBB, MI, TII.get(IA64::CMPNE), DestReg).addReg(IA64::r2).addReg(IA64::r0);
} else assert(0 &&
"sorry, I don't know how to load this sort of reg from the stack\n");
}
void IA64RegisterInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
SmallVectorImpl<MachineOperand> &Addr,
const TargetRegisterClass *RC,
SmallVectorImpl<MachineInstr*> &NewMIs) const {
unsigned Opc = 0;
if (RC == IA64::FPRegisterClass) {
Opc = IA64::LDF8;
} else if (RC == IA64::GRRegisterClass) {
Opc = IA64::LD8;
} else if (RC == IA64::PRRegisterClass) {
Opc = IA64::LD1;
} else {
assert(0 &&
"sorry, I don't know how to store this sort of reg\n");
}
MachineInstrBuilder MIB = BuildMI(TII.get(Opc), DestReg);
for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
MachineOperand &MO = Addr[i];
if (MO.isRegister())
MIB.addReg(MO.getReg());
else if (MO.isImmediate())
MIB.addImm(MO.getImmedValue());
else
MIB.addFrameIndex(MO.getFrameIndex());
}
NewMIs.push_back(MIB);
return;
}
void IA64RegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC) const {
if (DestRC != SrcRC) {
cerr << "Not yet supported!";
abort();
}
if(DestRC == IA64::PRRegisterClass ) // if a bool, we use pseudocode
// (SrcReg) DestReg = cmp.eq.unc(r0, r0)
BuildMI(MBB, MI, TII.get(IA64::PCMPEQUNC), DestReg)
.addReg(IA64::r0).addReg(IA64::r0).addReg(SrcReg);
else // otherwise, MOV works (for both gen. regs and FP regs)
BuildMI(MBB, MI, TII.get(IA64::MOV), DestReg).addReg(SrcReg);
}
void IA64RegisterInfo::reMaterialize(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned DestReg,
const MachineInstr *Orig) const {
MachineInstr *MI = Orig->clone();
MI->getOperand(0).setReg(DestReg);
MBB.insert(I, MI);
}
const unsigned* IA64RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
const {
static const unsigned CalleeSavedRegs[] = {
IA64::r5, 0
};
return CalleeSavedRegs;
}
const TargetRegisterClass* const*
IA64RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
&IA64::GRRegClass, 0
};
return CalleeSavedRegClasses;
}
BitVector IA64RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
Reserved.set(IA64::r0);
Reserved.set(IA64::r1);
Reserved.set(IA64::r2);
Reserved.set(IA64::r5);
Reserved.set(IA64::r12);
Reserved.set(IA64::r13);
Reserved.set(IA64::r22);
Reserved.set(IA64::rp);
return Reserved;
}
//===----------------------------------------------------------------------===//
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
// hasFP - Return true if the specified function should have a dedicated frame
// pointer register. This is true if the function has variable sized allocas or
// if frame pointer elimination is disabled.
//
bool IA64RegisterInfo::hasFP(const MachineFunction &MF) const {
return NoFramePointerElim || MF.getFrameInfo()->hasVarSizedObjects();
}
void IA64RegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (hasFP(MF)) {
// If we have a frame pointer, turn the adjcallstackup instruction into a
// 'sub SP, <amt>' and the adjcallstackdown instruction into 'add SP,
// <amt>'
MachineInstr *Old = I;
unsigned Amount = Old->getOperand(0).getImmedValue();
if (Amount != 0) {
// We need to keep the stack aligned properly. To do this, we round the
// amount of space needed for the outgoing arguments up to the next
// alignment boundary.
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
Amount = (Amount+Align-1)/Align*Align;
MachineInstr *New;
if (Old->getOpcode() == IA64::ADJUSTCALLSTACKDOWN) {
New=BuildMI(TII.get(IA64::ADDIMM22), IA64::r12).addReg(IA64::r12)
.addImm(-Amount);
} else {
assert(Old->getOpcode() == IA64::ADJUSTCALLSTACKUP);
New=BuildMI(TII.get(IA64::ADDIMM22), IA64::r12).addReg(IA64::r12)
.addImm(Amount);
}
// Replace the pseudo instruction with a new instruction...
MBB.insert(I, New);
}
}
MBB.erase(I);
}
void IA64RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
int SPAdj, RegScavenger *RS)const{
assert(SPAdj == 0 && "Unexpected");
unsigned i = 0;
MachineInstr &MI = *II;
MachineBasicBlock &MBB = *MI.getParent();
MachineFunction &MF = *MBB.getParent();
bool FP = hasFP(MF);
while (!MI.getOperand(i).isFrameIndex()) {
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
}
int FrameIndex = MI.getOperand(i).getFrameIndex();
// choose a base register: ( hasFP? framepointer : stack pointer )
unsigned BaseRegister = FP ? IA64::r5 : IA64::r12;
// Add the base register
MI.getOperand(i).ChangeToRegister(BaseRegister, false);
// Now add the frame object offset to the offset from r1.
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
// If we're not using a Frame Pointer that has been set to the value of the
// SP before having the stack size subtracted from it, then add the stack size
// to Offset to get the correct offset.
Offset += MF.getFrameInfo()->getStackSize();
// XXX: we use 'r22' as another hack+slash temporary register here :(
if (Offset <= 8191 && Offset >= -8192) { // smallish offset
// Fix up the old:
MI.getOperand(i).ChangeToRegister(IA64::r22, false);
//insert the new
MachineInstr* nMI=BuildMI(TII.get(IA64::ADDIMM22), IA64::r22)
.addReg(BaseRegister).addImm(Offset);
MBB.insert(II, nMI);
} else { // it's big
//fix up the old:
MI.getOperand(i).ChangeToRegister(IA64::r22, false);
MachineInstr* nMI;
nMI=BuildMI(TII.get(IA64::MOVLIMM64), IA64::r22).addImm(Offset);
MBB.insert(II, nMI);
nMI=BuildMI(TII.get(IA64::ADD), IA64::r22).addReg(BaseRegister)
.addReg(IA64::r22);
MBB.insert(II, nMI);
}
}
void IA64RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineInstr *MI;
bool FP = hasFP(MF);
// first, we handle the 'alloc' instruction, that should be right up the
// top of any function
static const unsigned RegsInOrder[96] = { // there are 96 GPRs the
// RSE worries about
IA64::r32, IA64::r33, IA64::r34, IA64::r35,
IA64::r36, IA64::r37, IA64::r38, IA64::r39, IA64::r40, IA64::r41,
IA64::r42, IA64::r43, IA64::r44, IA64::r45, IA64::r46, IA64::r47,
IA64::r48, IA64::r49, IA64::r50, IA64::r51, IA64::r52, IA64::r53,
IA64::r54, IA64::r55, IA64::r56, IA64::r57, IA64::r58, IA64::r59,
IA64::r60, IA64::r61, IA64::r62, IA64::r63, IA64::r64, IA64::r65,
IA64::r66, IA64::r67, IA64::r68, IA64::r69, IA64::r70, IA64::r71,
IA64::r72, IA64::r73, IA64::r74, IA64::r75, IA64::r76, IA64::r77,
IA64::r78, IA64::r79, IA64::r80, IA64::r81, IA64::r82, IA64::r83,
IA64::r84, IA64::r85, IA64::r86, IA64::r87, IA64::r88, IA64::r89,
IA64::r90, IA64::r91, IA64::r92, IA64::r93, IA64::r94, IA64::r95,
IA64::r96, IA64::r97, IA64::r98, IA64::r99, IA64::r100, IA64::r101,
IA64::r102, IA64::r103, IA64::r104, IA64::r105, IA64::r106, IA64::r107,
IA64::r108, IA64::r109, IA64::r110, IA64::r111, IA64::r112, IA64::r113,
IA64::r114, IA64::r115, IA64::r116, IA64::r117, IA64::r118, IA64::r119,
IA64::r120, IA64::r121, IA64::r122, IA64::r123, IA64::r124, IA64::r125,
IA64::r126, IA64::r127 };
unsigned numStackedGPRsUsed=0;
for(int i=0; i<96; i++) {
if(MF.isPhysRegUsed(RegsInOrder[i]))
numStackedGPRsUsed=i+1; // (i+1 and not ++ - consider fn(fp, fp, int)
}
unsigned numOutRegsUsed=MF.getInfo<IA64FunctionInfo>()->outRegsUsed;
// XXX FIXME : this code should be a bit more reliable (in case there _isn't_
// a pseudo_alloc in the MBB)
unsigned dstRegOfPseudoAlloc;
for(MBBI = MBB.begin(); /*MBBI->getOpcode() != IA64::PSEUDO_ALLOC*/; ++MBBI) {
assert(MBBI != MBB.end());
if(MBBI->getOpcode() == IA64::PSEUDO_ALLOC) {
dstRegOfPseudoAlloc=MBBI->getOperand(0).getReg();
break;
}
}
MI=BuildMI(TII.get(IA64::ALLOC)).addReg(dstRegOfPseudoAlloc).addImm(0). \
addImm(numStackedGPRsUsed).addImm(numOutRegsUsed).addImm(0);
MBB.insert(MBBI, MI);
// Get the number of bytes to allocate from the FrameInfo
unsigned NumBytes = MFI->getStackSize();
if(FP)
NumBytes += 8; // reserve space for the old FP
// Do we need to allocate space on the stack?
if (NumBytes == 0)
return;
// Add 16 bytes at the bottom of the stack (scratch area)
// and round the size to a multiple of the alignment.
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
unsigned Size = 16 + (FP ? 8 : 0);
NumBytes = (NumBytes+Size+Align-1)/Align*Align;
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);
// adjust stack pointer: r12 -= numbytes
if (NumBytes <= 8191) {
MI=BuildMI(TII.get(IA64::ADDIMM22),IA64::r12).addReg(IA64::r12).
addImm(-NumBytes);
MBB.insert(MBBI, MI);
} else { // we use r22 as a scratch register here
MI=BuildMI(TII.get(IA64::MOVLIMM64), IA64::r22).addImm(-NumBytes);
// FIXME: MOVLSI32 expects a _u_32imm
MBB.insert(MBBI, MI); // first load the decrement into r22
MI=BuildMI(TII.get(IA64::ADD), IA64::r12).addReg(IA64::r12).addReg(IA64::r22);
MBB.insert(MBBI, MI); // then add (subtract) it to r12 (stack ptr)
}
// now if we need to, save the old FP and set the new
if (FP) {
MI = BuildMI(TII.get(IA64::ST8)).addReg(IA64::r12).addReg(IA64::r5);
MBB.insert(MBBI, MI);
// this must be the last instr in the prolog ? (XXX: why??)
MI = BuildMI(TII.get(IA64::MOV), IA64::r5).addReg(IA64::r12);
MBB.insert(MBBI, MI);
}
}
void IA64RegisterInfo::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
MachineBasicBlock::iterator MBBI = prior(MBB.end());
MachineInstr *MI;
assert(MBBI->getOpcode() == IA64::RET &&
"Can only insert epilog into returning blocks");
bool FP = hasFP(MF);
// Get the number of bytes allocated from the FrameInfo...
unsigned NumBytes = MFI->getStackSize();
//now if we need to, restore the old FP
if (FP)
{
//copy the FP into the SP (discards allocas)
MI=BuildMI(TII.get(IA64::MOV), IA64::r12).addReg(IA64::r5);
MBB.insert(MBBI, MI);
//restore the FP
MI=BuildMI(TII.get(IA64::LD8), IA64::r5).addReg(IA64::r5);
MBB.insert(MBBI, MI);
}
if (NumBytes != 0)
{
if (NumBytes <= 8191) {
MI=BuildMI(TII.get(IA64::ADDIMM22),IA64::r12).addReg(IA64::r12).
addImm(NumBytes);
MBB.insert(MBBI, MI);
} else {
MI=BuildMI(TII.get(IA64::MOVLIMM64), IA64::r22).addImm(NumBytes);
MBB.insert(MBBI, MI);
MI=BuildMI(TII.get(IA64::ADD), IA64::r12).addReg(IA64::r12).
addReg(IA64::r22);
MBB.insert(MBBI, MI);
}
}
}
unsigned IA64RegisterInfo::getRARegister() const {
assert(0 && "What is the return address register");
return 0;
}
unsigned IA64RegisterInfo::getFrameRegister(MachineFunction &MF) const {
return hasFP(MF) ? IA64::r5 : IA64::r12;
}
unsigned IA64RegisterInfo::getEHExceptionRegister() const {
assert(0 && "What is the exception register");
return 0;
}
unsigned IA64RegisterInfo::getEHHandlerRegister() const {
assert(0 && "What is the exception handler register");
return 0;
}
int IA64RegisterInfo::getDwarfRegNum(unsigned RegNum) const {
assert(0 && "What is the dwarf register number");
return -1;
}
#include "IA64GenRegisterInfo.inc"
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