// 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
MoveEmitterMIPS::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 (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::emitFloat32Move(const MoveOperand& from, const MoveOperand& to)
{
// Register pairs are used to store Double values during calls.
MOZ_ASSERT(!from.isGeneralRegPair());
MOZ_ASSERT(!to.isGeneralRegPair());
if (from.isFloatReg()) {
if (to.isFloatReg())
masm.ma_vmov_f32(from.floatReg(), to.floatReg());
else if (to.isGeneralReg())
masm.ma_vxfer(from.floatReg(), to.reg());
else
masm.ma_vstr(VFPRegister(from.floatReg()).singleOverlay(), toAddress(to));
} else if (from.isGeneralReg()) {
if (to.isFloatReg())
masm.ma_vxfer(from.reg(), to.floatReg());
else if (to.isGeneralReg())
masm.ma_mov(from.reg(), to.reg());
else
masm.ma_str(from.reg(), toAddress(to));
} else if (to.isFloatReg()) {
masm.ma_vldr(toAddress(from), VFPRegister(to.floatReg()).singleOverlay());
} else if (to.isGeneralReg()) {
masm.ma_ldr(toAddress(from), to.reg());
} else {
// Memory to memory move.
MOZ_ASSERT(from.isMemory());
FloatRegister reg = ScratchFloat32Reg;
masm.ma_vldr(toAddress(from), VFPRegister(reg).singleOverlay());
masm.ma_vstr(VFPRegister(reg).singleOverlay(), toAddress(to));
}
}
void
MoveEmitterX86::emitInt32Move(const MoveOperand &from, const MoveOperand &to)
{
if (from.isGeneralReg()) {
masm.move32(from.reg(), toOperand(to));
} else if (to.isGeneralReg()) {
JS_ASSERT(from.isMemory());
masm.load32(toAddress(from), to.reg());
} else {
// Memory to memory gpr move.
JS_ASSERT(from.isMemory());
#ifdef JS_CODEGEN_X64
// x64 has a ScratchReg. Use it.
masm.load32(toAddress(from), ScratchReg);
masm.move32(ScratchReg, toOperand(to));
#else
// No ScratchReg; bounce it off the stack.
masm.Push(toOperand(from));
masm.Pop(toPopOperand(to));
#endif
}
}
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.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.
#ifdef JS_CODEGEN_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_CODEGEN_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
}
}
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::emitInt32Move(const MoveOperand& from, const MoveOperand& to)
{
if (from.isGeneralReg()) {
masm.move32(from.reg(), toOperand(to));
} else if (to.isGeneralReg()) {
MOZ_ASSERT(from.isMemory());
masm.load32(toAddress(from), to.reg());
} else {
// Memory to memory gpr move.
MOZ_ASSERT(from.isMemory());
if (hasScratchRegister()) {
Register reg = scratchRegister();
masm.load32(toAddress(from), reg);
masm.move32(reg, toOperand(to));
} else {
// No scratch register available; bounce it off the stack.
masm.Push(toOperand(from));
masm.Pop(toPopOperand(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));
}
}
}
void
MoveEmitterX86::completeCycle(const MoveOperand &to, MoveOp::Type type)
{
// There is some pattern:
// (A -> B)
// (B -> A)
//
// This case handles (B -> A), which we reach last. We emit a move from the
// saved value of B, to A.
switch (type) {
case MoveOp::FLOAT32:
JS_ASSERT(pushedAtCycle_ != -1);
JS_ASSERT(pushedAtCycle_ - pushedAtStart_ >= sizeof(float));
if (to.isMemory()) {
masm.loadFloat32(cycleSlot(), ScratchFloatReg);
masm.storeFloat32(ScratchFloatReg, toAddress(to));
} else {
masm.loadFloat32(cycleSlot(), to.floatReg());
}
break;
case MoveOp::DOUBLE:
JS_ASSERT(pushedAtCycle_ != -1);
JS_ASSERT(pushedAtCycle_ - pushedAtStart_ >= sizeof(double));
if (to.isMemory()) {
masm.loadDouble(cycleSlot(), ScratchFloatReg);
masm.storeDouble(ScratchFloatReg, toAddress(to));
} else {
masm.loadDouble(cycleSlot(), to.floatReg());
}
break;
case MoveOp::INT32:
#ifdef JS_CODEGEN_X64
JS_ASSERT(pushedAtCycle_ != -1);
JS_ASSERT(pushedAtCycle_ - pushedAtStart_ >= sizeof(int32_t));
// x64 can't pop to a 32-bit destination.
if (to.isMemory()) {
masm.load32(cycleSlot(), ScratchReg);
masm.store32(ScratchReg, toAddress(to));
} else {
masm.load32(cycleSlot(), to.reg());
}
break;
#endif
case MoveOp::GENERAL:
JS_ASSERT(masm.framePushed() - pushedAtStart_ >= sizeof(intptr_t));
masm.Pop(toPopOperand(to));
break;
default:
MOZ_ASSUME_UNREACHABLE("Unexpected move type");
}
}
void
MoveEmitterX86::breakCycle(const MoveOperand &to, MoveOp::Type type)
{
// There is some pattern:
// (A -> B)
// (B -> A)
//
// This case handles (A -> B), which we reach first. We save B, then allow
// the original move to continue.
switch (type) {
case MoveOp::FLOAT32:
if (to.isMemory()) {
masm.loadFloat32(toAddress(to), ScratchFloatReg);
masm.storeFloat32(ScratchFloatReg, cycleSlot());
} else {
masm.storeFloat32(to.floatReg(), cycleSlot());
}
break;
case MoveOp::DOUBLE:
if (to.isMemory()) {
masm.loadDouble(toAddress(to), ScratchFloatReg);
masm.storeDouble(ScratchFloatReg, cycleSlot());
} else {
masm.storeDouble(to.floatReg(), cycleSlot());
}
break;
#ifdef JS_CPU_X64
case MoveOp::INT32:
// x64 can't pop to a 32-bit destination, so don't push.
if (to.isMemory()) {
masm.load32(toAddress(to), ScratchReg);
masm.store32(ScratchReg, cycleSlot());
} else {
masm.store32(to.reg(), cycleSlot());
}
break;
#endif
#ifndef JS_CPU_X64
case MoveOp::INT32:
#endif
case MoveOp::GENERAL:
masm.Push(toOperand(to));
break;
default:
MOZ_ASSUME_UNREACHABLE("Unexpected move type");
}
}
void
MacroAssemblerX64::passABIArg(const MoveOperand& from, MoveOp::Type type)
{
MoveOperand to;
switch (type) {
case MoveOp::FLOAT32:
case MoveOp::DOUBLE: {
FloatRegister dest;
if (GetFloatArgReg(passedIntArgs_, passedFloatArgs_++, &dest)) {
// Convert to the right type of register.
if (type == MoveOp::FLOAT32)
dest = dest.asSingle();
if (from.isFloatReg() && from.floatReg() == dest) {
// Nothing to do; the value is in the right register already
return;
}
to = MoveOperand(dest);
} else {
to = MoveOperand(StackPointer, stackForCall_);
switch (type) {
case MoveOp::FLOAT32: stackForCall_ += sizeof(float); break;
case MoveOp::DOUBLE: stackForCall_ += sizeof(double); break;
default: MOZ_CRASH("Unexpected float register class argument type");
}
}
break;
}
case MoveOp::GENERAL: {
Register dest;
if (GetIntArgReg(passedIntArgs_++, passedFloatArgs_, &dest)) {
if (from.isGeneralReg() && from.reg() == dest) {
// Nothing to do; the value is in the right register already
return;
}
to = MoveOperand(dest);
} else {
to = MoveOperand(StackPointer, stackForCall_);
stackForCall_ += sizeof(int64_t);
}
break;
}
default:
MOZ_CRASH("Unexpected argument type");
}
enoughMemory_ = moveResolver_.addMove(from, to, type);
}
// 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
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));
}
}
// This is the same as toOperand except that it computes an Operand suitable for
// use in a pop.
Operand
MoveEmitterX86::toPopOperand(const MoveOperand& operand) const
{
if (operand.isMemory()) {
if (operand.base() != StackPointer)
return Operand(operand.base(), operand.disp());
MOZ_ASSERT(operand.disp() >= 0);
// Otherwise, the stack offset may need to be adjusted.
// Note the adjustment by the stack slot here, to offset for the fact that pop
// computes its effective address after incrementing the stack pointer.
return Operand(StackPointer,
operand.disp() + (masm.framePushed() - sizeof(void*) - pushedAtStart_));
}
if (operand.isGeneralReg())
return Operand(operand.reg());
MOZ_ASSERT(operand.isFloatReg());
return Operand(operand.floatReg());
}
void
MoveEmitterARM::emitMove(const MoveOperand& from, const MoveOperand& to)
{
// Register pairs are used to store Double values during calls.
MOZ_ASSERT(!from.isGeneralRegPair());
MOZ_ASSERT(!to.isGeneralRegPair());
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;
}
if (to.isMemoryOrEffectiveAddress())
masm.ma_str(from.reg(), toAddress(to));
else
masm.ma_mov(from.reg(), to.reg());
} else if (to.isGeneralReg()) {
MOZ_ASSERT(from.isMemoryOrEffectiveAddress());
if (from.isMemory())
masm.ma_ldr(toAddress(from), to.reg());
else
masm.ma_add(from.base(), Imm32(from.disp()), to.reg());
} else {
// Memory to memory gpr move.
Register reg = tempReg();
MOZ_ASSERT(from.isMemoryOrEffectiveAddress());
if (from.isMemory())
masm.ma_ldr(toAddress(from), reg);
else
masm.ma_add(from.base(), Imm32(from.disp()), reg);
MOZ_ASSERT(to.base() != reg);
masm.ma_str(reg, toAddress(to));
}
}
void
MoveEmitterX86::breakCycle(const MoveOperand &to, Move::Kind kind)
{
// There is some pattern:
// (A -> B)
// (B -> A)
//
// This case handles (A -> B), which we reach first. We save B, then allow
// the original move to continue.
if (kind == Move::DOUBLE) {
if (to.isMemory()) {
masm.movsd(toOperand(to), ScratchFloatReg);
masm.movsd(ScratchFloatReg, cycleSlot());
} else {
masm.movsd(to.floatReg(), cycleSlot());
}
} else {
if (to.isMemory())
masm.Push(toOperand(to));
else
masm.Push(to.reg());
}
}
void
MoveEmitterX86::completeCycle(const MoveOperand &to, Move::Kind kind)
{
// There is some pattern:
// (A -> B)
// (B -> A)
//
// This case handles (B -> A), which we reach last. We emit a move from the
// saved value of B, to A.
if (kind == Move::DOUBLE) {
if (to.isMemory()) {
masm.movsd(cycleSlot(), ScratchFloatReg);
masm.movsd(ScratchFloatReg, toOperand(to));
} else {
masm.movsd(cycleSlot(), to.floatReg());
}
} else {
if (to.isMemory()) {
masm.Pop(toPopOperand(to));
} else {
masm.Pop(to.reg());
}
}
}
void
MoveEmitterARM::completeCycle(const MoveOperand& from, const MoveOperand& to, MoveOp::Type type, uint32_t slotId)
{
// There is some pattern:
// (A -> B)
// (B -> A)
//
// This case handles (B -> A), which we reach last. We emit a move from the
// saved value of B, to A.
switch (type) {
case MoveOp::FLOAT32:
MOZ_ASSERT(!to.isGeneralRegPair());
if (to.isMemory()) {
ScratchFloat32Scope scratch(masm);
masm.ma_vldr(cycleSlot(slotId, 0), scratch);
masm.ma_vstr(scratch, toAddress(to));
} else if (to.isGeneralReg()) {
MOZ_ASSERT(type == MoveOp::FLOAT32);
masm.ma_ldr(toAddress(from), to.reg());
} else {
uint32_t offset = 0;
if ((!from.isMemory()) && from.floatReg().numAlignedAliased() == 1)
offset = sizeof(float);
masm.ma_vldr(cycleSlot(slotId, offset), to.floatReg());
}
break;
case MoveOp::DOUBLE:
MOZ_ASSERT(!to.isGeneralReg());
if (to.isMemory()) {
ScratchDoubleScope scratch(masm);
masm.ma_vldr(cycleSlot(slotId, 0), scratch);
masm.ma_vstr(scratch, toAddress(to));
} else if (to.isGeneralRegPair()) {
MOZ_ASSERT(type == MoveOp::DOUBLE);
ScratchDoubleScope scratch(masm);
masm.ma_vldr(toAddress(from), scratch);
masm.ma_vxfer(scratch, to.evenReg(), to.oddReg());
} else {
uint32_t offset = 0;
if ((!from.isMemory()) && from.floatReg().numAlignedAliased() == 1)
offset = sizeof(float);
masm.ma_vldr(cycleSlot(slotId, offset), to.floatReg());
}
break;
case MoveOp::INT32:
case MoveOp::GENERAL:
MOZ_ASSERT(slotId == 0);
if (to.isMemory()) {
Register temp = tempReg();
masm.ma_ldr(cycleSlot(slotId, 0), temp);
masm.ma_str(temp, toAddress(to));
} else {
if (to.reg() == spilledReg_) {
// Make sure we don't re-clobber the spilled register later.
spilledReg_ = InvalidReg;
}
masm.ma_ldr(cycleSlot(slotId, 0), to.reg());
}
break;
default:
MOZ_CRASH("Unexpected move type");
}
}
void
MoveEmitterARM::breakCycle(const MoveOperand& from, const MoveOperand& to,
MoveOp::Type type, uint32_t slotId)
{
// There is some pattern:
// (A -> B)
// (B -> A)
//
// This case handles (A -> B), which we reach first. We save B, then allow
// the original move to continue.
switch (type) {
case MoveOp::FLOAT32:
if (to.isMemory()) {
VFPRegister temp = ScratchFloat32Reg;
masm.ma_vldr(toAddress(to), temp);
// Since it is uncertain if the load will be aligned or not
// just fill both of them with the same value.
masm.ma_vstr(temp, cycleSlot(slotId, 0));
masm.ma_vstr(temp, cycleSlot(slotId, 4));
} else if (to.isGeneralReg()) {
// Since it is uncertain if the load will be aligned or not
// just fill both of them with the same value.
masm.ma_str(to.reg(), cycleSlot(slotId, 0));
masm.ma_str(to.reg(), cycleSlot(slotId, 4));
} else {
FloatRegister src = to.floatReg();
// Just always store the largest possible size. Currently, this is
// a double. When SIMD is added, two doubles will need to be stored.
masm.ma_vstr(src.doubleOverlay(), cycleSlot(slotId, 0));
}
break;
case MoveOp::DOUBLE:
if (to.isMemory()) {
ScratchDoubleScope scratch(masm);
masm.ma_vldr(toAddress(to), scratch);
masm.ma_vstr(scratch, cycleSlot(slotId, 0));
} else if (to.isGeneralRegPair()) {
ScratchDoubleScope scratch(masm);
masm.ma_vxfer(to.evenReg(), to.oddReg(), scratch);
masm.ma_vstr(scratch, cycleSlot(slotId, 0));
} else {
masm.ma_vstr(to.floatReg().doubleOverlay(), cycleSlot(slotId, 0));
}
break;
case MoveOp::INT32:
case MoveOp::GENERAL:
// an non-vfp value
if (to.isMemory()) {
Register temp = tempReg();
masm.ma_ldr(toAddress(to), temp);
masm.ma_str(temp, cycleSlot(0,0));
} else {
if (to.reg() == spilledReg_) {
// If the destination was spilled, restore it first.
masm.ma_ldr(spillSlot(), spilledReg_);
spilledReg_ = InvalidReg;
}
masm.ma_str(to.reg(), cycleSlot(0,0));
}
break;
default:
MOZ_CRASH("Unexpected move type");
}
}
