void
MoveEmitterMIPS::emitMove(const MoveOperand &from, const MoveOperand &to)
{
if (from.isGeneralReg()) {
// Second scratch register should not be moved by MoveEmitter.
MOZ_ASSERT(from.reg() != spilledReg_);
if (to.isGeneralReg())
masm.movePtr(from.reg(), to.reg());
else if (to.isMemory())
masm.storePtr(from.reg(), getAdjustedAddress(to));
else
MOZ_ASSUME_UNREACHABLE("Invalid emitMove arguments.");
} else if (from.isMemory()) {
if (to.isGeneralReg()) {
masm.loadPtr(getAdjustedAddress(from), to.reg());
} else if (to.isMemory()) {
masm.loadPtr(getAdjustedAddress(from), tempReg());
masm.storePtr(tempReg(), getAdjustedAddress(to));
} else {
MOZ_ASSUME_UNREACHABLE("Invalid emitMove arguments.");
}
} else if (from.isEffectiveAddress()) {
if (to.isGeneralReg()) {
masm.computeEffectiveAddress(getAdjustedAddress(from), to.reg());
} else if (to.isMemory()) {
masm.computeEffectiveAddress(getAdjustedAddress(from), tempReg());
masm.storePtr(tempReg(), getAdjustedAddress(to));
} else {
MOZ_ASSUME_UNREACHABLE("Invalid emitMove arguments.");
}
} else {
MOZ_ASSUME_UNREACHABLE("Invalid emitMove arguments.");
}
}
void
MoveEmitterARM::emitMove(const MoveOperand &from, const MoveOperand &to)
{
if (to.isGeneralReg() && to.reg() == spilledReg_) {
// If the destination is the spilled register, make sure we
// don't re-clobber its value.
spilledReg_ = InvalidReg;
}
if (from.isGeneralReg()) {
if (from.reg() == spilledReg_) {
// If the source is a register that has been spilled, make sure
// to load the source back into that register.
masm.ma_ldr(spillSlot(), spilledReg_);
spilledReg_ = InvalidReg;
}
switch (toOperand(to, false).getTag()) {
case Operand::OP2:
// secretly must be a register
masm.ma_mov(from.reg(), to.reg());
break;
case Operand::MEM:
masm.ma_str(from.reg(), toOperand(to, false));
break;
default:
MOZ_ASSUME_UNREACHABLE("strange move!");
}
} else if (to.isGeneralReg()) {
JS_ASSERT(from.isMemory() || from.isEffectiveAddress());
if (from.isMemory())
masm.ma_ldr(toOperand(from, false), to.reg());
else
masm.ma_add(from.base(), Imm32(from.disp()), to.reg());
} else {
// Memory to memory gpr move.
Register reg = tempReg();
JS_ASSERT(from.isMemory() || from.isEffectiveAddress());
if (from.isMemory())
masm.ma_ldr(toOperand(from, false), reg);
else
masm.ma_add(from.base(), Imm32(from.disp()), reg);
JS_ASSERT(to.base() != reg);
masm.ma_str(reg, toOperand(to, false));
}
}
// Warning, do not use the resulting operand with pop instructions, since they
// compute the effective destination address after altering the stack pointer.
// Use toPopOperand if an Operand is needed for a pop.
Operand
MoveEmitterX86::toOperand(const MoveOperand &operand) const
{
if (operand.isMemory() || operand.isEffectiveAddress() || operand.isFloatAddress())
return Operand(toAddress(operand));
if (operand.isGeneralReg())
return Operand(operand.reg());
JS_ASSERT(operand.isFloatReg());
return Operand(operand.floatReg());
}
void
MoveEmitterMIPS::emitMove(const MoveOperand &from, const MoveOperand &to)
{
if (to.isGeneralReg() && to.reg() == spilledReg_) {
// If the destination is the spilled register, make sure we
// don't re-clobber its value.
spilledReg_ = InvalidReg;
}
if (from.isGeneralReg()) {
if (from.reg() == spilledReg_) {
// If the source is a register that has been spilled, make sure
// to load the source back into that register.
masm.mov(spillSlot(), spilledReg_);
spilledReg_ = InvalidReg;
}
masm.mov(from.reg(), toOperand(to));
} else if (to.isGeneralReg()) {
JS_ASSERT(from.isMemory() || from.isEffectiveAddress());
if (from.isMemory())
masm.mov(toOperand(from), to.reg());
else
masm.lea(toOperand(from), to.reg());
} else {
// Memory to memory gpr move.
Register reg = tempReg();
// Reload its previous value from the stack.
if (reg == from.base())
masm.mov(spillSlot(), from.base());
JS_ASSERT(from.isMemory() || from.isEffectiveAddress());
if (from.isMemory())
masm.mov(toOperand(from), reg);
else
masm.lea(toOperand(from), reg);
JS_ASSERT(to.base() != reg);
masm.mov(reg, toOperand(to));
}
}
void
MoveEmitterX86::emitGeneralMove(const MoveOperand &from, const MoveOperand &to)
{
if (from.isGeneralReg()) {
masm.mov(from.reg(), toOperand(to));
} else if (to.isGeneralReg()) {
JS_ASSERT(from.isMemory() || from.isEffectiveAddress());
if (from.isMemory())
masm.loadPtr(toAddress(from), to.reg());
else
masm.lea(toOperand(from), to.reg());
} else if (from.isMemory()) {
// Memory to memory gpr move.
#ifdef JS_CPU_X64
// x64 has a ScratchReg. Use it.
masm.loadPtr(toAddress(from), ScratchReg);
masm.mov(ScratchReg, toOperand(to));
#else
// No ScratchReg; bounce it off the stack.
masm.Push(toOperand(from));
masm.Pop(toPopOperand(to));
#endif
} else {
// Effective address to memory move.
JS_ASSERT(from.isEffectiveAddress());
#ifdef JS_CPU_X64
// x64 has a ScratchReg. Use it.
masm.lea(toOperand(from), ScratchReg);
masm.mov(ScratchReg, toOperand(to));
#else
// This is tricky without a ScratchReg. We can't do an lea. Bounce the
// base register off the stack, then add the offset in place. Note that
// this clobbers FLAGS!
masm.Push(from.base());
masm.Pop(toPopOperand(to));
masm.addPtr(Imm32(from.disp()), toOperand(to));
#endif
}
}
// Warning, do not use the resulting operand with pop instructions, since they
// compute the effective destination address after altering the stack pointer.
// Use toPopOperand if an Operand is needed for a pop.
Operand
MoveEmitterX86::toOperand(const MoveOperand &operand) const
{
if (operand.isMemory() || operand.isEffectiveAddress() || operand.isFloatAddress()) {
if (operand.base() != StackPointer)
return Operand(operand.base(), operand.disp());
JS_ASSERT(operand.disp() >= 0);
// Otherwise, the stack offset may need to be adjusted.
return Operand(StackPointer, operand.disp() + (masm.framePushed() - pushedAtStart_));
}
if (operand.isGeneralReg())
return Operand(operand.reg());
JS_ASSERT(operand.isFloatReg());
return Operand(operand.floatReg());
}
void MoveEmitterARM64::emitGeneralMove(const MoveOperand& from,
const MoveOperand& to) {
if (from.isGeneralReg()) {
MOZ_ASSERT(to.isGeneralReg() || to.isMemory());
if (to.isGeneralReg()) {
masm.Mov(toARMReg64(to), toARMReg64(from));
} else {
masm.Str(toARMReg64(from), toMemOperand(to));
}
return;
}
// {Memory OR EffectiveAddress} -> Register move.
if (to.isGeneralReg()) {
MOZ_ASSERT(from.isMemoryOrEffectiveAddress());
if (from.isMemory()) {
masm.Ldr(toARMReg64(to), toMemOperand(from));
} else {
masm.Add(toARMReg64(to), toARMReg64(from), Operand(from.disp()));
}
return;
}
vixl::UseScratchRegisterScope temps(&masm.asVIXL());
const ARMRegister scratch64 = temps.AcquireX();
// Memory -> Memory move.
if (from.isMemory()) {
MOZ_ASSERT(to.isMemory());
masm.Ldr(scratch64, toMemOperand(from));
masm.Str(scratch64, toMemOperand(to));
return;
}
// EffectiveAddress -> Memory move.
MOZ_ASSERT(from.isEffectiveAddress());
MOZ_ASSERT(to.isMemory());
masm.Add(scratch64, toARMReg64(from), Operand(from.disp()));
masm.Str(scratch64, toMemOperand(to));
}
void
MoveEmitterX86::emitGeneralMove(const MoveOperand& from, const MoveOperand& to)
{
if (from.isGeneralReg()) {
masm.mov(from.reg(), toOperand(to));
} else if (to.isGeneralReg()) {
MOZ_ASSERT(from.isMemoryOrEffectiveAddress());
if (from.isMemory())
masm.loadPtr(toAddress(from), to.reg());
else
masm.lea(toOperand(from), to.reg());
} else if (from.isMemory()) {
// Memory to memory gpr move.
if (hasScratchRegister()) {
Register reg = scratchRegister();
masm.loadPtr(toAddress(from), reg);
masm.mov(reg, toOperand(to));
} else {
// No scratch register available; bounce it off the stack.
masm.Push(toOperand(from));
masm.Pop(toPopOperand(to));
}
} else {
// Effective address to memory move.
MOZ_ASSERT(from.isEffectiveAddress());
if (hasScratchRegister()) {
Register reg = scratchRegister();
masm.lea(toOperand(from), reg);
masm.mov(reg, toOperand(to));
} else {
// This is tricky without a scratch reg. We can't do an lea. Bounce the
// base register off the stack, then add the offset in place. Note that
// this clobbers FLAGS!
masm.Push(from.base());
masm.Pop(toPopOperand(to));
masm.addPtr(Imm32(from.disp()), toOperand(to));
}
}
}