//===- AlphaRegisterInfo.cpp - Alpha Register Information -------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This file contains the Alpha implementation of the MRegisterInfo class.
#include "AlphaRegisterInfo.h"
#include "llvm/Constants.h"
#include "llvm/Type.h"
+#include "llvm/Function.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 <iostream>
using namespace llvm;
+//These describe LDAx
+static const int IMM_LOW = -32768;
+static const int IMM_HIGH = 32767;
+static const int IMM_MULT = 65536;
+
+static long getUpper16(long l)
+{
+ long y = l / IMM_MULT;
+ if (l % IMM_MULT > IMM_HIGH)
+ ++y;
+ return y;
+}
-AlphaRegisterInfo::AlphaRegisterInfo()
- : AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP)
+static long getLower16(long l)
{
+ long h = getUpper16(l);
+ return l - h * IMM_MULT;
}
-static const TargetRegisterClass *getClass(unsigned SrcReg) {
- if (Alpha::FPRCRegisterClass->contains(SrcReg))
- return Alpha::FPRCRegisterClass;
- assert(Alpha::GPRCRegisterClass->contains(SrcReg) && "Reg not FPR or GPR");
- return Alpha::GPRCRegisterClass;
+AlphaRegisterInfo::AlphaRegisterInfo(const TargetInstrInfo &tii)
+ : AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP),
+ TII(tii)
+{
}
-void
+void
AlphaRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
- unsigned SrcReg, int FrameIdx) const {
- //std::cerr << "Trying to store " << getPrettyName(SrcReg) << " to " << FrameIdx << "\n";
+ unsigned SrcReg, int FrameIdx,
+ const TargetRegisterClass *RC) const {
+ //std::cerr << "Trying to store " << getPrettyName(SrcReg) << " to "
+ //<< FrameIdx << "\n";
//BuildMI(MBB, MI, Alpha::WTF, 0).addReg(SrcReg);
- if (getClass(SrcReg) == Alpha::FPRCRegisterClass)
- BuildMI(MBB, MI, Alpha::STT, 3).addReg(SrcReg).addFrameIndex(FrameIdx).addReg(Alpha::F31);
- else if (getClass(SrcReg) == Alpha::GPRCRegisterClass)
- BuildMI(MBB, MI, Alpha::STQ, 3).addReg(SrcReg).addFrameIndex(FrameIdx).addReg(Alpha::F31);
+ if (RC == Alpha::F4RCRegisterClass)
+ BuildMI(MBB, MI, Alpha::STS, 3)
+ .addReg(SrcReg).addFrameIndex(FrameIdx).addReg(Alpha::F31);
+ else if (RC == Alpha::F8RCRegisterClass)
+ BuildMI(MBB, MI, Alpha::STT, 3)
+ .addReg(SrcReg).addFrameIndex(FrameIdx).addReg(Alpha::F31);
+ else if (RC == Alpha::GPRCRegisterClass)
+ BuildMI(MBB, MI, Alpha::STQ, 3)
+ .addReg(SrcReg).addFrameIndex(FrameIdx).addReg(Alpha::F31);
else
abort();
}
void
AlphaRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
- unsigned DestReg, int FrameIdx) const{
- //std::cerr << "Trying to load " << getPrettyName(DestReg) << " to " << FrameIdx << "\n";
- if (getClass(DestReg) == Alpha::FPRCRegisterClass)
- BuildMI(MBB, MI, Alpha::LDT, 2, DestReg).addFrameIndex(FrameIdx).addReg(Alpha::F31);
- else if (getClass(DestReg) == Alpha::GPRCRegisterClass)
- BuildMI(MBB, MI, Alpha::LDQ, 2, DestReg).addFrameIndex(FrameIdx).addReg(Alpha::F31);
+ unsigned DestReg, int FrameIdx,
+ const TargetRegisterClass *RC) const {
+ //std::cerr << "Trying to load " << getPrettyName(DestReg) << " to "
+ //<< FrameIdx << "\n";
+ if (RC == Alpha::F4RCRegisterClass)
+ BuildMI(MBB, MI, Alpha::LDS, 2, DestReg)
+ .addFrameIndex(FrameIdx).addReg(Alpha::F31);
+ else if (RC == Alpha::F8RCRegisterClass)
+ BuildMI(MBB, MI, Alpha::LDT, 2, DestReg)
+ .addFrameIndex(FrameIdx).addReg(Alpha::F31);
+ else if (RC == Alpha::GPRCRegisterClass)
+ BuildMI(MBB, MI, Alpha::LDQ, 2, DestReg)
+ .addFrameIndex(FrameIdx).addReg(Alpha::F31);
else
abort();
}
+MachineInstr *AlphaRegisterInfo::foldMemoryOperand(MachineInstr *MI,
+ unsigned OpNum,
+ int FrameIndex) const {
+ // Make sure this is a reg-reg copy.
+ unsigned Opc = MI->getOpcode();
+
+ switch(Opc) {
+ default:
+ break;
+ case Alpha::BISr:
+ case Alpha::CPYSS:
+ case Alpha::CPYST:
+ if (MI->getOperand(1).getReg() == MI->getOperand(2).getReg()) {
+ if (OpNum == 0) { // move -> store
+ unsigned InReg = MI->getOperand(1).getReg();
+ Opc = (Opc == Alpha::BISr) ? Alpha::STQ :
+ ((Opc == Alpha::CPYSS) ? Alpha::STS : Alpha::STT);
+ return BuildMI(TII, Opc, 3).addReg(InReg).addFrameIndex(FrameIndex)
+ .addReg(Alpha::F31);
+ } else { // load -> move
+ unsigned OutReg = MI->getOperand(0).getReg();
+ Opc = (Opc == Alpha::BISr) ? Alpha::LDQ :
+ ((Opc == Alpha::CPYSS) ? Alpha::LDS : Alpha::LDT);
+ return BuildMI(TII, Opc, 2, OutReg).addFrameIndex(FrameIndex)
+ .addReg(Alpha::F31);
+ }
+ }
+ break;
+ }
+ return 0;
+}
+
+
void AlphaRegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *RC) const {
// std::cerr << "copyRegToReg " << DestReg << " <- " << SrcReg << "\n";
if (RC == Alpha::GPRCRegisterClass) {
- BuildMI(MBB, MI, Alpha::BIS, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
- } else if (RC == Alpha::FPRCRegisterClass) {
- BuildMI(MBB, MI, Alpha::CPYS, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
- } else {
+ BuildMI(MBB, MI, Alpha::BISr, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
+ } else if (RC == Alpha::F4RCRegisterClass) {
+ BuildMI(MBB, MI, Alpha::CPYSS, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
+ } else if (RC == Alpha::F8RCRegisterClass) {
+ BuildMI(MBB, MI, Alpha::CPYST, 2, DestReg).addReg(SrcReg).addReg(SrcReg);
+ } else {
std::cerr << "Attempt to copy register that is not GPR or FPR";
abort();
}
}
+const unsigned* AlphaRegisterInfo::getCalleeSaveRegs() const {
+ static const unsigned CalleeSaveRegs[] = {
+ Alpha::R9, Alpha::R10,
+ Alpha::R11, Alpha::R12,
+ Alpha::R13, Alpha::R14,
+ Alpha::F2, Alpha::F3,
+ Alpha::F4, Alpha::F5,
+ Alpha::F6, Alpha::F7,
+ Alpha::F8, Alpha::F9, 0
+ };
+ return CalleeSaveRegs;
+}
+
+const TargetRegisterClass* const*
+AlphaRegisterInfo::getCalleeSaveRegClasses() const {
+ static const TargetRegisterClass * const CalleeSaveRegClasses[] = {
+ &Alpha::GPRCRegClass, &Alpha::GPRCRegClass,
+ &Alpha::GPRCRegClass, &Alpha::GPRCRegClass,
+ &Alpha::GPRCRegClass, &Alpha::GPRCRegClass,
+ &Alpha::F8RCRegClass, &Alpha::F8RCRegClass,
+ &Alpha::F8RCRegClass, &Alpha::F8RCRegClass,
+ &Alpha::F8RCRegClass, &Alpha::F8RCRegClass,
+ &Alpha::F8RCRegClass, &Alpha::F8RCRegClass, 0
+ };
+ return CalleeSaveRegClasses;
+}
+
//===----------------------------------------------------------------------===//
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
// pointer register. This is true if the function has variable sized allocas or
// if frame pointer elimination is disabled.
//
-static bool hasFP(MachineFunction &MF) {
+static bool hasFP(const MachineFunction &MF) {
MachineFrameInfo *MFI = MF.getFrameInfo();
return MFI->hasVarSizedObjects();
}
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (hasFP(MF)) {
- assert(0 && "TODO");
// If we have a frame pointer, turn the adjcallstackup instruction into a
// 'sub ESP, <amt>' and the adjcallstackdown instruction into 'add ESP,
// <amt>'
MachineInstr *Old = I;
- unsigned Amount = Old->getOperand(0).getImmedValue();
+ uint64_t 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
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
Amount = (Amount+Align-1)/Align*Align;
-// MachineInstr *New;
-// if (Old->getOpcode() == X86::ADJCALLSTACKDOWN) {
-// New=BuildMI(X86::SUB32ri, 1, X86::ESP, MachineOperand::UseAndDef)
-// .addZImm(Amount);
-// } else {
-// assert(Old->getOpcode() == X86::ADJCALLSTACKUP);
-// New=BuildMI(X86::ADD32ri, 1, X86::ESP, MachineOperand::UseAndDef)
-// .addZImm(Amount);
-// }
+ MachineInstr *New;
+ if (Old->getOpcode() == Alpha::ADJUSTSTACKDOWN) {
+ New=BuildMI(TII, Alpha::LDA, 2, Alpha::R30)
+ .addImm(-Amount).addReg(Alpha::R30);
+ } else {
+ assert(Old->getOpcode() == Alpha::ADJUSTSTACKUP);
+ New=BuildMI(TII, Alpha::LDA, 2, Alpha::R30)
+ .addImm(Amount).addReg(Alpha::R30);
+ }
// Replace the pseudo instruction with a new instruction...
- //MBB.insert(I, New);
- abort();
+ MBB.insert(I, New);
}
}
MBB.erase(I);
}
+//Alpha has a slightly funny stack:
+//Args
+//<- incoming SP
+//fixed locals (and spills, callee saved, etc)
+//<- FP
+//variable locals
+//<- SP
+
void
AlphaRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
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();
// Add the base register of R30 (SP) or R15 (FP).
- MI.SetMachineOperandReg(i + 1, hasFP(MF) ? Alpha::R15 : Alpha::R30);
-
- // Now add the frame object offset to the offset from r1.
+ MI.getOperand(i + 1).ChangeToRegister(FP ? Alpha::R15 : Alpha::R30, false);
+
+ // Now add the frame object offset to the offset from the virtual frame index.
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.
+ DEBUG(std::cerr << "FI: " << FrameIndex << " Offset: " << Offset << "\n");
+
Offset += MF.getFrameInfo()->getStackSize();
- if (Offset > 32767 || Offset < -32768) {
- std::cerr << "Offset needs to be " << Offset << "\n";
- assert(0 && "stack too big");
- } else {
- MI.SetMachineOperandConst(i, MachineOperand::MO_SignExtendedImmed, Offset);
- }
+ DEBUG(std::cerr << "Corrected Offset " << Offset <<
+ " for stack size: " << MF.getFrameInfo()->getStackSize() << "\n");
+
+ if (Offset > IMM_HIGH || Offset < IMM_LOW) {
+ DEBUG(std::cerr << "Unconditionally using R28 for evil purposes Offset: "
+ << Offset << "\n");
+ //so in this case, we need to use a temporary register, and move the
+ //original inst off the SP/FP
+ //fix up the old:
+ MI.getOperand(i + 1).ChangeToRegister(Alpha::R28, false);
+ MI.getOperand(i).ChangeToImmediate(getLower16(Offset));
+ //insert the new
+ MachineInstr* nMI=BuildMI(TII, Alpha::LDAH, 2, Alpha::R28)
+ .addImm(getUpper16(Offset)).addReg(FP ? Alpha::R15 : Alpha::R30);
+ MBB.insert(II, nMI);
+ } else {
+ MI.getOperand(i).ChangeToImmediate(Offset);
+ }
}
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineInstr *MI;
-
+ bool FP = hasFP(MF);
+
+ static int curgpdist = 0;
+
//handle GOP offset
- MI = BuildMI(Alpha::LDGP, 0);
- MBB.insert(MBBI, MI);
+ BuildMI(MBB, MBBI, Alpha::LDAHg, 3, Alpha::R29)
+ .addGlobalAddress(const_cast<Function*>(MF.getFunction()))
+ .addReg(Alpha::R27).addImm(++curgpdist);
+ BuildMI(MBB, MBBI, Alpha::LDAg, 3, Alpha::R29)
+ .addGlobalAddress(const_cast<Function*>(MF.getFunction()))
+ .addReg(Alpha::R29).addImm(curgpdist);
+
+ //evil const_cast until MO stuff setup to handle const
+ BuildMI(MBB, MBBI, Alpha::ALTENT, 1)
+ .addGlobalAddress(const_cast<Function*>(MF.getFunction()));
// Get the number of bytes to allocate from the FrameInfo
- unsigned NumBytes = MFI->getStackSize();
+ long NumBytes = MFI->getStackSize();
- if (MFI->hasCalls()) {
- // We reserve argument space for call sites in the function immediately on
- // entry to the current function. This eliminates the need for add/sub
+ if (MFI->hasCalls() && !FP) {
+ // We reserve argument space for call sites in the function immediately on
+ // entry to the current function. This eliminates the need for add/sub
// brackets around call sites.
+ //If there is a frame pointer, then we don't do this
NumBytes += MFI->getMaxCallFrameSize();
- std::cerr << "Added " << MFI->getMaxCallFrameSize() << " to the stack due to calls\n";
+ DEBUG(std::cerr << "Added " << MFI->getMaxCallFrameSize()
+ << " to the stack due to calls\n");
}
+ if (FP)
+ NumBytes += 8; //reserve space for the old FP
+
// Do we need to allocate space on the stack?
if (NumBytes == 0) return;
- // Add the size of R30 to NumBytes size for the store of R30 to the
- // stack
-// std::cerr << "Spillsize of R30 is " << getSpillSize(Alpha::R30) << "\n";
-// NumBytes = NumBytes + getSpillSize(Alpha::R30)/8;
+ unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
+ NumBytes = (NumBytes+Align-1)/Align*Align;
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);
-
+
// adjust stack pointer: r30 -= numbytes
-
- if (NumBytes <= 32767) {
- MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-NumBytes).addReg(Alpha::R30);
- MBB.insert(MBBI, MI);
- } else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
- long y = NumBytes / 65536;
- if (NumBytes % 65536 > 32767)
- ++y;
- MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(-y).addReg(Alpha::R30);
- MBB.insert(MBBI, MI);
- MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-(NumBytes - y * 65536)).addReg(Alpha::R30);
- MBB.insert(MBBI, MI);
+ NumBytes = -NumBytes;
+ if (NumBytes >= IMM_LOW) {
+ BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30).addImm(NumBytes)
+ .addReg(Alpha::R30);
+ } else if (getUpper16(NumBytes) >= IMM_LOW) {
+ BuildMI(MBB, MBBI, Alpha::LDAH, 2, Alpha::R30).addImm(getUpper16(NumBytes))
+ .addReg(Alpha::R30);
+ BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30).addImm(getLower16(NumBytes))
+ .addReg(Alpha::R30);
} else {
std::cerr << "Too big a stack frame at " << NumBytes << "\n";
abort();
}
+
+ //now if we need to, save the old FP and set the new
+ if (FP)
+ {
+ BuildMI(MBB, MBBI, Alpha::STQ, 3)
+ .addReg(Alpha::R15).addImm(0).addReg(Alpha::R30);
+ //this must be the last instr in the prolog
+ BuildMI(MBB, MBBI, Alpha::BISr, 2, Alpha::R15)
+ .addReg(Alpha::R30).addReg(Alpha::R30);
+ }
+
}
void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
MachineBasicBlock::iterator MBBI = prior(MBB.end());
- MachineInstr *MI;
- assert((MBBI->getOpcode() == Alpha::RET || MBBI->getOpcode() == Alpha::RETURN) &&
- "Can only insert epilog into returning blocks");
-
+ assert(MBBI->getOpcode() == Alpha::RETDAG ||
+ MBBI->getOpcode() == Alpha::RETDAGp
+ && "Can only insert epilog into returning blocks");
+
+ bool FP = hasFP(MF);
+
// Get the number of bytes allocated from the FrameInfo...
- unsigned NumBytes = MFI->getStackSize();
+ long NumBytes = MFI->getStackSize();
+
+ //now if we need to, restore the old FP
+ if (FP)
+ {
+ //copy the FP into the SP (discards allocas)
+ BuildMI(MBB, MBBI, Alpha::BISr, 2, Alpha::R30).addReg(Alpha::R15)
+ .addReg(Alpha::R15);
+ //restore the FP
+ BuildMI(MBB, MBBI, Alpha::LDQ, 2, Alpha::R15).addImm(0).addReg(Alpha::R15);
+ }
- if (NumBytes != 0)
+ if (NumBytes != 0)
{
- if (NumBytes <= 32767) {
- MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes).addReg(Alpha::R30);
- MBB.insert(MBBI, MI);
- } else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
- long y = NumBytes / 65536;
- if (NumBytes % 65536 > 32767)
- ++y;
- MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(y).addReg(Alpha::R30);
- MBB.insert(MBBI, MI);
- MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes - y * 65536).addReg(Alpha::R30);
- MBB.insert(MBBI, MI);
+ if (NumBytes <= IMM_HIGH) {
+ BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30).addImm(NumBytes)
+ .addReg(Alpha::R30);
+ } else if (getUpper16(NumBytes) <= IMM_HIGH) {
+ BuildMI(MBB, MBBI, Alpha::LDAH, 2, Alpha::R30)
+ .addImm(getUpper16(NumBytes)).addReg(Alpha::R30);
+ BuildMI(MBB, MBBI, Alpha::LDA, 2, Alpha::R30)
+ .addImm(getLower16(NumBytes)).addReg(Alpha::R30);
} else {
std::cerr << "Too big a stack frame at " << NumBytes << "\n";
abort();
}
}
-#include "AlphaGenRegisterInfo.inc"
+unsigned AlphaRegisterInfo::getRARegister() const {
+ assert(0 && "What is the return address register");
+ return 0;
+}
-const TargetRegisterClass*
-AlphaRegisterInfo::getRegClassForType(const Type* Ty) const {
- switch (Ty->getTypeID()) {
- default: assert(0 && "Invalid type to getClass!");
- case Type::BoolTyID:
- case Type::SByteTyID:
- case Type::UByteTyID:
- case Type::ShortTyID:
- case Type::UShortTyID:
- case Type::IntTyID:
- case Type::UIntTyID:
- case Type::PointerTyID:
- case Type::LongTyID:
- case Type::ULongTyID: return &GPRCInstance;
-
- case Type::FloatTyID:
- case Type::DoubleTyID: return &FPRCInstance;
- }
+unsigned AlphaRegisterInfo::getFrameRegister(MachineFunction &MF) const {
+ return hasFP(MF) ? Alpha::R15 : Alpha::R30;
}
+#include "AlphaGenRegisterInfo.inc"
+
std::string AlphaRegisterInfo::getPrettyName(unsigned reg)
{
std::string s(RegisterDescriptors[reg].Name);
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