pcsx2/common/emitter/implement/dwshift.h

45 lines
1.8 KiB
C++

/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2010 PCSX2 Dev Team
*
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
namespace x86Emitter
{
// Implementations here cover SHLD and SHRD.
// --------------------------------------------------------------------------------------
// xImpl_DowrdShift
// --------------------------------------------------------------------------------------
// I use explicit method declarations here instead of templates, in order to provide
// *only* 32 and 16 bit register operand forms (8 bit registers are not valid in SHLD/SHRD).
//
// Optimization Note: Imm shifts by 0 are ignore (no code generated). This is a safe optimization
// because shifts by 0 do *not* affect flags status (intel docs cited).
//
struct xImpl_DwordShift
{
u16 OpcodeBase;
void operator()(const xRegister16or32or64& to, const xRegister16or32or64& from, const xRegisterCL& clreg) const;
void operator()(const xRegister16or32or64& to, const xRegister16or32or64& from, u8 shiftcnt) const;
void operator()(const xIndirectVoid& dest, const xRegister16or32or64& from, const xRegisterCL& clreg) const;
void operator()(const xIndirectVoid& dest, const xRegister16or32or64& from, u8 shiftcnt) const;
};
} // End namespace x86Emitter