mirror of https://github.com/PCSX2/pcsx2.git
45 lines
2.0 KiB
C++
45 lines
2.0 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2010 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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namespace x86Emitter {
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// Implementations here cover SHLD and SHRD.
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// --------------------------------------------------------------------------------------
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// xImpl_DowrdShift
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// --------------------------------------------------------------------------------------
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// I use explicit method declarations here instead of templates, in order to provide
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// *only* 32 and 16 bit register operand forms (8 bit registers are not valid in SHLD/SHRD).
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//
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// Optimization Note: Imm shifts by 0 are ignore (no code generated). This is a safe optimization
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// because shifts by 0 do *not* affect flags status (intel docs cited).
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//
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struct xImpl_DwordShift
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{
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u16 OpcodeBase;
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void operator()( const xRegister32& to, const xRegister32& from, const xRegisterCL& clreg ) const;
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void operator()( const xRegister16& to, const xRegister16& from, const xRegisterCL& clreg ) const;
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void operator()( const xRegister32& to, const xRegister32& from, u8 shiftcnt ) const;
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void operator()( const xRegister16& to, const xRegister16& from, u8 shiftcnt ) const;
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void operator()( const ModSibBase& dest,const xRegister16or32& from, const xRegisterCL& clreg ) const;
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void operator()( const ModSibBase& dest,const xRegister16or32& from, u8 shiftcnt ) const;
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};
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} // End namespace x86Emitter
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