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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/. */
#ifndef jit_MoveEmitter_x86_shared_h
#define jit_MoveEmitter_x86_shared_h
#include "mozilla/Maybe.h"
#include <stddef.h>
#include <stdint.h>
#include "jit/MoveResolver.h"
#include "jit/Registers.h"
namespace js {
namespace jit {
struct Address;
class MacroAssembler;
class Operand;
class MoveEmitterX86 {
bool inCycle_;
MacroAssembler& masm;
// Original stack push value.
uint32_t pushedAtStart_;
// This is a store stack offset for the cycle-break spill slot, snapshotting
// codegen->framePushed_ at the time it is allocated. -1 if not allocated.
int32_t pushedAtCycle_;
#ifdef JS_CODEGEN_X86
// Optional scratch register for performing moves.
mozilla::Maybe<Register> scratchRegister_;
#endif
void assertDone();
Address cycleSlot();
Address toAddress(const MoveOperand& operand) const;
Operand toOperand(const MoveOperand& operand) const;
Operand toPopOperand(const MoveOperand& operand) const;
size_t characterizeCycle(const MoveResolver& moves, size_t i,
bool* allGeneralRegs, bool* allFloatRegs);
bool maybeEmitOptimizedCycle(const MoveResolver& moves, size_t i,
bool allGeneralRegs, bool allFloatRegs,
size_t swapCount);
void emitInt32Move(const MoveOperand& from, const MoveOperand& to,
const MoveResolver& moves, size_t i);
void emitGeneralMove(const MoveOperand& from, const MoveOperand& to,
const MoveResolver& moves, size_t i);
void emitFloat32Move(const MoveOperand& from, const MoveOperand& to);
void emitDoubleMove(const MoveOperand& from, const MoveOperand& to);
void emitSimd128Move(const MoveOperand& from, const MoveOperand& to);
void breakCycle(const MoveOperand& to, MoveOp::Type type);
void completeCycle(const MoveOperand& to, MoveOp::Type type);
public:
explicit MoveEmitterX86(MacroAssembler& masm);
~MoveEmitterX86();
void emit(const MoveResolver& moves);
void finish();
void setScratchRegister(Register reg) {
#ifdef JS_CODEGEN_X86
scratchRegister_.emplace(reg);
#endif
}
mozilla::Maybe<Register> findScratchRegister(const MoveResolver& moves,
size_t i);
};
using MoveEmitter = MoveEmitterX86;
} // namespace jit
} // namespace js
#endif /* jit_MoveEmitter_x86_shared_h */
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