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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* 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/mips32/MoveEmitter-mips32.h"
#include "jit/MacroAssembler-inl.h"
using namespace js;
using namespace js::jit;
void MoveEmitterMIPS::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()) {
FloatRegister temp = ScratchFloat32Reg;
masm.loadFloat32(getAdjustedAddress(to), temp);
// Since it is uncertain if the load will be aligned or not
// just fill both of them with the same value.
masm.storeFloat32(temp, cycleSlot(slotId, 0));
masm.storeFloat32(temp, cycleSlot(slotId, 4));
} else {
// Just always store the largest possible size.
masm.storeDouble(to.floatReg().doubleOverlay(), cycleSlot(slotId, 0));
}
break;
case MoveOp::DOUBLE:
if (to.isMemory()) {
FloatRegister temp = ScratchDoubleReg;
masm.loadDouble(getAdjustedAddress(to), temp);
masm.storeDouble(temp, cycleSlot(slotId, 0));
} else {
masm.storeDouble(to.floatReg(), cycleSlot(slotId, 0));
}
break;
case MoveOp::INT32:
MOZ_ASSERT(sizeof(uintptr_t) == sizeof(int32_t));
[[fallthrough]];
case MoveOp::GENERAL:
if (to.isMemory()) {
Register temp = tempReg();
masm.loadPtr(getAdjustedAddress(to), temp);
masm.storePtr(temp, cycleSlot(0, 0));
} else {
// Second scratch register should not be moved by MoveEmitter.
MOZ_ASSERT(to.reg() != spilledReg_);
masm.storePtr(to.reg(), cycleSlot(0, 0));
}
break;
default:
MOZ_CRASH("Unexpected move type");
}
}
void MoveEmitterMIPS::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:
if (to.isMemory()) {
FloatRegister temp = ScratchFloat32Reg;
masm.loadFloat32(cycleSlot(slotId, 0), temp);
masm.storeFloat32(temp, getAdjustedAddress(to));
} else {
uint32_t offset = 0;
if (from.floatReg().numAlignedAliased() == 1) {
offset = sizeof(float);
}
masm.loadFloat32(cycleSlot(slotId, offset), to.floatReg());
}
break;
case MoveOp::DOUBLE:
if (to.isMemory()) {
FloatRegister temp = ScratchDoubleReg;
masm.loadDouble(cycleSlot(slotId, 0), temp);
masm.storeDouble(temp, getAdjustedAddress(to));
} else {
masm.loadDouble(cycleSlot(slotId, 0), to.floatReg());
}
break;
case MoveOp::INT32:
MOZ_ASSERT(sizeof(uintptr_t) == sizeof(int32_t));
[[fallthrough]];
case MoveOp::GENERAL:
MOZ_ASSERT(slotId == 0);
if (to.isMemory()) {
Register temp = tempReg();
masm.loadPtr(cycleSlot(0, 0), temp);
masm.storePtr(temp, getAdjustedAddress(to));
} else {
// Second scratch register should not be moved by MoveEmitter.
MOZ_ASSERT(to.reg() != spilledReg_);
masm.loadPtr(cycleSlot(0, 0), to.reg());
}
break;
default:
MOZ_CRASH("Unexpected move type");
}
}
void MoveEmitterMIPS::emitDoubleMove(const MoveOperand& from,
const MoveOperand& to) {
if (from.isFloatReg()) {
if (to.isFloatReg()) {
masm.moveDouble(from.floatReg(), to.floatReg());
} else if (to.isGeneralRegPair()) {
// Used for passing double parameter in a2,a3 register pair.
// Two moves are added for one double parameter by
// MacroAssembler::passABIArg
MOZ_ASSERT(to.evenReg() == a2 && to.oddReg() == a3,
"Invalid emitDoubleMove arguments.");
masm.moveFromDoubleLo(from.floatReg(), a2);
masm.moveFromDoubleHi(from.floatReg(), a3);
} else {
MOZ_ASSERT(to.isMemory());
masm.storeDouble(from.floatReg(), getAdjustedAddress(to));
}
} else if (to.isFloatReg()) {
MOZ_ASSERT(from.isMemory());
masm.loadDouble(getAdjustedAddress(from), to.floatReg());
} else if (to.isGeneralRegPair()) {
// Used for passing double parameter in a2,a3 register pair.
// Two moves are added for one double parameter by
// MacroAssembler::passABIArg
MOZ_ASSERT(from.isMemory());
MOZ_ASSERT(to.evenReg() == a2 && to.oddReg() == a3,
"Invalid emitDoubleMove arguments.");
masm.loadPtr(getAdjustedAddress(from), a2);
masm.loadPtr(
Address(from.base(), getAdjustedOffset(from) + sizeof(uint32_t)), a3);
} else {
MOZ_ASSERT(from.isMemory());
MOZ_ASSERT(to.isMemory());
masm.loadDouble(getAdjustedAddress(from), ScratchDoubleReg);
masm.storeDouble(ScratchDoubleReg, getAdjustedAddress(to));
}
}
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