mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
- Avoid the longer SIB encoding on x86_64 when it's not needed.
- Synchronize instruction length computation code in X86InstrInfo with code in X86CodeEmitter.cpp Patch by Zoltan Varga. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70929 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
35738ac150
commit
b0030ddca4
@ -338,8 +338,8 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
|
||||
unsigned BaseReg = Base.getReg();
|
||||
|
||||
// Is a SIB byte needed?
|
||||
if ((!Is64BitMode || DispForReloc) && IndexReg.getReg() == 0 &&
|
||||
(BaseReg == 0 || getX86RegNum(BaseReg) != N86::ESP)) {
|
||||
if (IndexReg.getReg() == 0 && (!Is64BitMode || BaseReg != 0) &&
|
||||
(BaseReg == 0 || getX86RegNum(BaseReg) != N86::ESP)) {
|
||||
if (BaseReg == 0) { // Just a displacement?
|
||||
// Emit special case [disp32] encoding
|
||||
MCE.emitByte(ModRMByte(0, RegOpcodeField, 5));
|
||||
|
@ -2811,8 +2811,8 @@ static unsigned getMemModRMByteSize(const MachineInstr &MI, unsigned Op,
|
||||
unsigned BaseReg = Base.getReg();
|
||||
|
||||
// Is a SIB byte needed?
|
||||
if ((!Is64BitMode || DispForReloc) && IndexReg.getReg() == 0 &&
|
||||
(BaseReg == 0 || X86RegisterInfo::getX86RegNum(BaseReg) != N86::ESP)) {
|
||||
if (IndexReg.getReg() == 0 && (!Is64BitMode || BaseReg != 0) &&
|
||||
(BaseReg == 0 || X86RegisterInfo::getX86RegNum(BaseReg) != N86::ESP)) {
|
||||
if (BaseReg == 0) { // Just a displacement?
|
||||
// Emit special case [disp32] encoding
|
||||
++FinalSize;
|
||||
@ -2932,6 +2932,9 @@ static unsigned GetInstSizeWithDesc(const MachineInstr &MI,
|
||||
unsigned CurOp = 0;
|
||||
if (NumOps > 1 && Desc->getOperandConstraint(1, TOI::TIED_TO) != -1)
|
||||
CurOp++;
|
||||
else if (NumOps > 2 && Desc->getOperandConstraint(NumOps-1, TOI::TIED_TO)== 0)
|
||||
// Skip the last source operand that is tied_to the dest reg. e.g. LXADD32
|
||||
--NumOps;
|
||||
|
||||
switch (Desc->TSFlags & X86II::FormMask) {
|
||||
default: assert(0 && "Unknown FormMask value in X86 MachineCodeEmitter!");
|
||||
@ -3022,7 +3025,7 @@ static unsigned GetInstSizeWithDesc(const MachineInstr &MI,
|
||||
case X86II::MRMDestMem: {
|
||||
++FinalSize;
|
||||
FinalSize += getMemModRMByteSize(MI, CurOp, IsPIC, Is64BitMode);
|
||||
CurOp += 5;
|
||||
CurOp += X86AddrNumOperands + 1;
|
||||
if (CurOp != NumOps) {
|
||||
++CurOp;
|
||||
FinalSize += sizeConstant(X86InstrInfo::sizeOfImm(Desc));
|
||||
@ -3041,10 +3044,16 @@ static unsigned GetInstSizeWithDesc(const MachineInstr &MI,
|
||||
break;
|
||||
|
||||
case X86II::MRMSrcMem: {
|
||||
int AddrOperands;
|
||||
if (Opcode == X86::LEA64r || Opcode == X86::LEA64_32r ||
|
||||
Opcode == X86::LEA16r || Opcode == X86::LEA32r)
|
||||
AddrOperands = X86AddrNumOperands - 1; // No segment register
|
||||
else
|
||||
AddrOperands = X86AddrNumOperands;
|
||||
|
||||
++FinalSize;
|
||||
FinalSize += getMemModRMByteSize(MI, CurOp+1, IsPIC, Is64BitMode);
|
||||
CurOp += 5;
|
||||
CurOp += AddrOperands + 1;
|
||||
if (CurOp != NumOps) {
|
||||
++CurOp;
|
||||
FinalSize += sizeConstant(X86InstrInfo::sizeOfImm(Desc));
|
||||
@ -3057,8 +3066,14 @@ static unsigned GetInstSizeWithDesc(const MachineInstr &MI,
|
||||
case X86II::MRM4r: case X86II::MRM5r:
|
||||
case X86II::MRM6r: case X86II::MRM7r:
|
||||
++FinalSize;
|
||||
++CurOp;
|
||||
FinalSize += sizeRegModRMByte();
|
||||
// Special handling of lfence and mfence.
|
||||
if (Desc->getOpcode() == X86::LFENCE ||
|
||||
Desc->getOpcode() == X86::MFENCE)
|
||||
FinalSize += sizeRegModRMByte();
|
||||
else {
|
||||
++CurOp;
|
||||
FinalSize += sizeRegModRMByte();
|
||||
}
|
||||
|
||||
if (CurOp != NumOps) {
|
||||
const MachineOperand &MO1 = MI.getOperand(CurOp++);
|
||||
@ -3088,7 +3103,7 @@ static unsigned GetInstSizeWithDesc(const MachineInstr &MI,
|
||||
|
||||
++FinalSize;
|
||||
FinalSize += getMemModRMByteSize(MI, CurOp, IsPIC, Is64BitMode);
|
||||
CurOp += 4;
|
||||
CurOp += X86AddrNumOperands;
|
||||
|
||||
if (CurOp != NumOps) {
|
||||
const MachineOperand &MO = MI.getOperand(CurOp++);
|
||||
|
Loading…
Reference in New Issue
Block a user