1 //===- IA64InstrInfo.cpp - IA64 Instruction Information -----------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the IA64 implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "IA64InstrInfo.h"
16 #include "IA64InstrBuilder.h"
17 #include "llvm/CodeGen/MachineInstrBuilder.h"
18 #include "llvm/ADT/SmallVector.h"
19 #include "IA64GenInstrInfo.inc"
22 IA64InstrInfo::IA64InstrInfo()
23 : TargetInstrInfoImpl(IA64Insts, sizeof(IA64Insts)/sizeof(IA64Insts[0])),
28 bool IA64InstrInfo::isMoveInstr(const MachineInstr& MI,
30 unsigned& destReg) const {
31 unsigned oc = MI.getOpcode();
32 if (oc == IA64::MOV || oc == IA64::FMOV) {
33 // TODO: this doesn't detect predicate moves
34 assert(MI.getNumOperands() >= 2 &&
35 /* MI.getOperand(0).isReg() &&
36 MI.getOperand(1).isReg() && */
37 "invalid register-register move instruction");
38 if (MI.getOperand(0).isReg() &&
39 MI.getOperand(1).isReg()) {
40 // if both operands of the MOV/FMOV are registers, then
41 // yes, this is a move instruction
42 sourceReg = MI.getOperand(1).getReg();
43 destReg = MI.getOperand(0).getReg();
47 return false; // we don't consider e.g. %regN = MOV <FrameIndex #x> a
52 IA64InstrInfo::InsertBranch(MachineBasicBlock &MBB,MachineBasicBlock *TBB,
53 MachineBasicBlock *FBB,
54 const SmallVectorImpl<MachineOperand> &Cond)const {
55 // Can only insert uncond branches so far.
56 assert(Cond.empty() && !FBB && TBB && "Can only handle uncond branches!");
57 BuildMI(&MBB, get(IA64::BRL_NOTCALL)).addMBB(TBB);
61 bool IA64InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
62 MachineBasicBlock::iterator MI,
63 unsigned DestReg, unsigned SrcReg,
64 const TargetRegisterClass *DestRC,
65 const TargetRegisterClass *SrcRC) const {
66 if (DestRC != SrcRC) {
71 if(DestRC == IA64::PRRegisterClass ) // if a bool, we use pseudocode
72 // (SrcReg) DestReg = cmp.eq.unc(r0, r0)
73 BuildMI(MBB, MI, get(IA64::PCMPEQUNC), DestReg)
74 .addReg(IA64::r0).addReg(IA64::r0).addReg(SrcReg);
75 else // otherwise, MOV works (for both gen. regs and FP regs)
76 BuildMI(MBB, MI, get(IA64::MOV), DestReg).addReg(SrcReg);
81 void IA64InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
82 MachineBasicBlock::iterator MI,
83 unsigned SrcReg, bool isKill,
85 const TargetRegisterClass *RC) const{
87 if (RC == IA64::FPRegisterClass) {
88 BuildMI(MBB, MI, get(IA64::STF_SPILL)).addFrameIndex(FrameIdx)
89 .addReg(SrcReg, false, false, isKill);
90 } else if (RC == IA64::GRRegisterClass) {
91 BuildMI(MBB, MI, get(IA64::ST8)).addFrameIndex(FrameIdx)
92 .addReg(SrcReg, false, false, isKill);
93 } else if (RC == IA64::PRRegisterClass) {
94 /* we use IA64::r2 as a temporary register for doing this hackery. */
96 BuildMI(MBB, MI, get(IA64::MOV), IA64::r2).addReg(IA64::r0);
97 // then conditionally add 1:
98 BuildMI(MBB, MI, get(IA64::CADDIMM22), IA64::r2).addReg(IA64::r2)
99 .addImm(1).addReg(SrcReg, false, false, isKill);
100 // and then store it to the stack
101 BuildMI(MBB, MI, get(IA64::ST8)).addFrameIndex(FrameIdx).addReg(IA64::r2);
103 "sorry, I don't know how to store this sort of reg in the stack\n");
106 void IA64InstrInfo::storeRegToAddr(MachineFunction &MF, unsigned SrcReg,
108 SmallVectorImpl<MachineOperand> &Addr,
109 const TargetRegisterClass *RC,
110 SmallVectorImpl<MachineInstr*> &NewMIs) const {
112 if (RC == IA64::FPRegisterClass) {
114 } else if (RC == IA64::GRRegisterClass) {
116 } else if (RC == IA64::PRRegisterClass) {
120 "sorry, I don't know how to store this sort of reg\n");
123 MachineInstrBuilder MIB = BuildMI(MF, get(Opc));
124 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
125 MachineOperand &MO = Addr[i];
127 MIB.addReg(MO.getReg());
129 MIB.addImm(MO.getImm());
131 MIB.addFrameIndex(MO.getIndex());
133 MIB.addReg(SrcReg, false, false, isKill);
134 NewMIs.push_back(MIB);
139 void IA64InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
140 MachineBasicBlock::iterator MI,
141 unsigned DestReg, int FrameIdx,
142 const TargetRegisterClass *RC)const{
144 if (RC == IA64::FPRegisterClass) {
145 BuildMI(MBB, MI, get(IA64::LDF_FILL), DestReg).addFrameIndex(FrameIdx);
146 } else if (RC == IA64::GRRegisterClass) {
147 BuildMI(MBB, MI, get(IA64::LD8), DestReg).addFrameIndex(FrameIdx);
148 } else if (RC == IA64::PRRegisterClass) {
149 // first we load a byte from the stack into r2, our 'predicate hackery'
151 BuildMI(MBB, MI, get(IA64::LD8), IA64::r2).addFrameIndex(FrameIdx);
152 // then we compare it to zero. If it _is_ zero, compare-not-equal to
153 // r0 gives us 0, which is what we want, so that's nice.
154 BuildMI(MBB, MI, get(IA64::CMPNE), DestReg).addReg(IA64::r2).addReg(IA64::r0);
156 "sorry, I don't know how to load this sort of reg from the stack\n");
159 void IA64InstrInfo::loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
160 SmallVectorImpl<MachineOperand> &Addr,
161 const TargetRegisterClass *RC,
162 SmallVectorImpl<MachineInstr*> &NewMIs) const {
164 if (RC == IA64::FPRegisterClass) {
166 } else if (RC == IA64::GRRegisterClass) {
168 } else if (RC == IA64::PRRegisterClass) {
172 "sorry, I don't know how to store this sort of reg\n");
175 MachineInstrBuilder MIB = BuildMI(MF, get(Opc), DestReg);
176 for (unsigned i = 0, e = Addr.size(); i != e; ++i) {
177 MachineOperand &MO = Addr[i];
179 MIB.addReg(MO.getReg());
181 MIB.addImm(MO.getImm());
183 MIB.addFrameIndex(MO.getIndex());
185 NewMIs.push_back(MIB);