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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "jit/mips-shared/MoveEmitter-mips-shared.h"
#include "jit/MacroAssembler-inl.h"
using namespace js;
using namespace js::jit;
void
MoveEmitterMIPSShared::emit(const MoveResolver& moves)
{
if (moves.numCycles()) {
// Reserve stack for cycle resolution
masm.reserveStack(moves.numCycles() * sizeof(double));
pushedAtCycle_ = masm.framePushed();
}
for (size_t i = 0; i < moves.numMoves(); i++)
emit(moves.getMove(i));
}
Address
MoveEmitterMIPSShared::cycleSlot(uint32_t slot, uint32_t subslot) const
{
int32_t offset = masm.framePushed() - pushedAtCycle_;
MOZ_ASSERT(Imm16::IsInSignedRange(offset));
return Address(StackPointer, offset + slot * sizeof(double) + subslot);
}
int32_t
MoveEmitterMIPSShared::getAdjustedOffset(const MoveOperand& operand)
{
MOZ_ASSERT(operand.isMemoryOrEffectiveAddress());
if (operand.base() != StackPointer)
return operand.disp();
// Adjust offset if stack pointer has been moved.
return operand.disp() + masm.framePushed() - pushedAtStart_;
}
Address
MoveEmitterMIPSShared::getAdjustedAddress(const MoveOperand& operand)
{
return Address(operand.base(), getAdjustedOffset(operand));
}
Register
MoveEmitterMIPSShared::tempReg()
{
spilledReg_ = SecondScratchReg;
return SecondScratchReg;
}
void
MoveEmitterMIPSShared::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_CRASH("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_CRASH("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_CRASH("Invalid emitMove arguments.");
}
} else {
MOZ_CRASH("Invalid emitMove arguments.");
}
}
void
MoveEmitterMIPSShared::emitInt32Move(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.move32(from.reg(), to.reg());
else if (to.isMemory())
masm.store32(from.reg(), getAdjustedAddress(to));
else
MOZ_CRASH("Invalid emitInt32Move arguments.");
} else if (from.isMemory()) {
if (to.isGeneralReg()) {
masm.load32(getAdjustedAddress(from), to.reg());
} else if (to.isMemory()) {
masm.load32(getAdjustedAddress(from), tempReg());
masm.store32(tempReg(), getAdjustedAddress(to));
} else {
MOZ_CRASH("Invalid emitInt32Move arguments.");
}
} else if (from.isEffectiveAddress()) {
if (to.isGeneralReg()) {
masm.computeEffectiveAddress(getAdjustedAddress(from), to.reg());
} else if (to.isMemory()) {
masm.computeEffectiveAddress(getAdjustedAddress(from), tempReg());
masm.store32(tempReg(), getAdjustedAddress(to));
} else {
MOZ_CRASH("Invalid emitInt32Move arguments.");
}
} else {
MOZ_CRASH("Invalid emitInt32Move arguments.");
}
}
void
MoveEmitterMIPSShared::emitFloat32Move(const MoveOperand& from, const MoveOperand& to)
{
// Ensure that we can use ScratchFloat32Reg in memory move.
MOZ_ASSERT_IF(from.isFloatReg(), from.floatReg() != ScratchFloat32Reg);
MOZ_ASSERT_IF(to.isFloatReg(), to.floatReg() != ScratchFloat32Reg);
if (from.isFloatReg()) {
if (to.isFloatReg()) {
masm.moveFloat32(from.floatReg(), to.floatReg());
} else if (to.isGeneralReg()) {
// This should only be used when passing float parameter in a1,a2,a3
MOZ_ASSERT(to.reg() == a1 || to.reg() == a2 || to.reg() == a3);
masm.moveFromFloat32(from.floatReg(), to.reg());
} else {
MOZ_ASSERT(to.isMemory());
masm.storeFloat32(from.floatReg(), getAdjustedAddress(to));
}
} else if (to.isFloatReg()) {
MOZ_ASSERT(from.isMemory());
masm.loadFloat32(getAdjustedAddress(from), to.floatReg());
} else if (to.isGeneralReg()) {
MOZ_ASSERT(from.isMemory());
// This should only be used when passing float parameter in a1,a2,a3
MOZ_ASSERT(to.reg() == a1 || to.reg() == a2 || to.reg() == a3);
masm.loadPtr(getAdjustedAddress(from), to.reg());
} else {
MOZ_ASSERT(from.isMemory());
MOZ_ASSERT(to.isMemory());
masm.loadFloat32(getAdjustedAddress(from), ScratchFloat32Reg);
masm.storeFloat32(ScratchFloat32Reg, getAdjustedAddress(to));
}
}
void
MoveEmitterMIPSShared::emit(const MoveOp& move)
{
const MoveOperand& from = move.from();
const MoveOperand& to = move.to();
if (move.isCycleEnd() && move.isCycleBegin()) {
// A fun consequence of aliased registers is you can have multiple
// cycles at once, and one can end exactly where another begins.
breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot());
completeCycle(from, to, move.type(), move.cycleEndSlot());
return;
}
if (move.isCycleEnd()) {
MOZ_ASSERT(inCycle_);
completeCycle(from, to, move.type(), move.cycleEndSlot());
MOZ_ASSERT(inCycle_ > 0);
inCycle_--;
return;
}
if (move.isCycleBegin()) {
breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot());
inCycle_++;
}
switch (move.type()) {
case MoveOp::FLOAT32:
emitFloat32Move(from, to);
break;
case MoveOp::DOUBLE:
emitDoubleMove(from, to);
break;
case MoveOp::INT32:
emitInt32Move(from, to);
break;
case MoveOp::GENERAL:
emitMove(from, to);
break;
default:
MOZ_CRASH("Unexpected move type");
}
}
void
MoveEmitterMIPSShared::assertDone()
{
MOZ_ASSERT(inCycle_ == 0);
}
void
MoveEmitterMIPSShared::finish()
{
assertDone();
masm.freeStack(masm.framePushed() - pushedAtStart_);
}
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