/[pcsx2_0.9.7]/trunk/common/include/x86emitter/implement/dwshift.h
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Contents of /trunk/common/include/x86emitter/implement/dwshift.h

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Revision 62 - (show annotations) (download)
Tue Sep 7 11:08:22 2010 UTC (9 years, 10 months ago) by william
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Auto Commited Import of: pcsx2-0.9.7-r3738-debug in ./trunk
1 /* PCSX2 - PS2 Emulator for PCs
2 * Copyright (C) 2002-2010 PCSX2 Dev Team
3 *
4 * PCSX2 is free software: you can redistribute it and/or modify it under the terms
5 * of the GNU Lesser General Public License as published by the Free Software Found-
6 * ation, either version 3 of the License, or (at your option) any later version.
7 *
8 * PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
9 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
10 * PURPOSE. See the GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License along with PCSX2.
13 * If not, see <http://www.gnu.org/licenses/>.
14 */
15
16 #pragma once
17
18 namespace x86Emitter {
19
20 // Implementations here cover SHLD and SHRD.
21
22 // --------------------------------------------------------------------------------------
23 // xImpl_DowrdShift
24 // --------------------------------------------------------------------------------------
25 // I use explicit method declarations here instead of templates, in order to provide
26 // *only* 32 and 16 bit register operand forms (8 bit registers are not valid in SHLD/SHRD).
27 //
28 // Optimization Note: Imm shifts by 0 are ignore (no code generated). This is a safe optimization
29 // because shifts by 0 do *not* affect flags status (intel docs cited).
30 //
31 struct xImpl_DwordShift
32 {
33 u16 OpcodeBase;
34
35 void operator()( const xRegister32& to, const xRegister32& from, const xRegisterCL& clreg ) const;
36 void operator()( const xRegister16& to, const xRegister16& from, const xRegisterCL& clreg ) const;
37 void operator()( const xRegister32& to, const xRegister32& from, u8 shiftcnt ) const;
38 void operator()( const xRegister16& to, const xRegister16& from, u8 shiftcnt ) const;
39
40 void operator()( const xIndirectVoid& dest,const xRegister16or32& from, const xRegisterCL& clreg ) const;
41 void operator()( const xIndirectVoid& dest,const xRegister16or32& from, u8 shiftcnt ) const;
42 };
43
44 } // End namespace x86Emitter

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