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Skip over first operand when determining REX prefix for two-address code. 

llvm-svn: 30300
This commit is contained in:
Evan Cheng 2006-09-13 19:07:28 +00:00
parent 3a4dc7b489
commit 92e5113d48
1 changed files with 14 additions and 7 deletions
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21
llvm/lib/Target/X86/X86CodeEmitter.cpp
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@ -470,9 +470,12 @@ unsigned Emitter::determineREX(const MachineInstr &MI) {
REX |= 1 << 3;
if (MI.getNumOperands()) {
bool isTwoAddr = (Desc.Flags & M_2_ADDR_FLAG) != 0;
// If it accesses SPL, BPL, SIL, or DIL, then it requires a 0x40 REX prefix.
bool isTrunc8 = isX86_64TruncToByte(Opcode);
for (unsigned i = 0, e = MI.getNumOperands(); i != e; ++i) {
unsigned i = isTwoAddr ? 1 : 0;
for (unsigned e = MI.getNumOperands(); i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isRegister()) {
unsigned Reg = MO.getReg();
@ -493,7 +496,8 @@ unsigned Emitter::determineREX(const MachineInstr &MI) {
case X86II::MRMSrcReg: {
if (isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 2;
for (unsigned i = 1, e = MI.getNumOperands(); i != e; ++i) {
i = isTwoAddr ? 2 : 1;
for (unsigned e = MI.getNumOperands(); i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (isX86_64ExtendedReg(MO))
REX |= 1 << 0;
@ -504,7 +508,8 @@ unsigned Emitter::determineREX(const MachineInstr &MI) {
if (isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 2;
unsigned Bit = 0;
for (unsigned i = 1; i != 5; ++i) {
i = isTwoAddr ? 2 : 1;
for (; i != MI.getNumOperands(); ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isRegister()) {
if (isX86_64ExtendedReg(MO))
@ -519,11 +524,12 @@ unsigned Emitter::determineREX(const MachineInstr &MI) {
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m:
case X86II::MRMDestMem: {
if (MI.getNumOperands() >= 5 &&
isX86_64ExtendedReg(MI.getOperand(4)))
unsigned e = isTwoAddr ? 5 : 4;
i = isTwoAddr ? 1 : 0;
if (MI.getNumOperands() > e && isX86_64ExtendedReg(MI.getOperand(e)))
REX |= 1 << 2;
unsigned Bit = 0;
for (unsigned i = 0; i != 4; ++i) {
for (; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isRegister()) {
if (isX86_64ExtendedReg(MO))
@ -536,7 +542,8 @@ unsigned Emitter::determineREX(const MachineInstr &MI) {
default: {
if (isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 0;
for (unsigned i = 1, e = MI.getNumOperands(); i != e; ++i) {
i = isTwoAddr ? 2 : 1;
for (unsigned e = MI.getNumOperands(); i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (isX86_64ExtendedReg(MO))
REX |= 1 << 2;