/[pcsx2_0.9.7]/trunk/3rdparty/SoundTouch/cpu_detect_x86_win.cpp
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Annotation of /trunk/3rdparty/SoundTouch/cpu_detect_x86_win.cpp

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Revision 8 - (hide annotations) (download)
Mon Sep 6 11:19:43 2010 UTC (9 years, 9 months ago) by william
File size: 4713 byte(s)
Exported ./upsream/trunk @r3730 from http://pcsx2.googlecode.com/svn/trunk/
1 william 8 ////////////////////////////////////////////////////////////////////////////////
2     ///
3     /// Win32 version of the x86 CPU detect routine.
4     ///
5     /// This file is to be compiled in Windows platform with Microsoft Visual C++
6     /// Compiler. Please see 'cpu_detect_x86_gcc.cpp' for the gcc compiler version
7     /// for all GNU platforms.
8     ///
9     /// Author : Copyright (c) Olli Parviainen
10     /// Author e-mail : oparviai 'at' iki.fi
11     /// SoundTouch WWW: http://www.surina.net/soundtouch
12     ///
13     ////////////////////////////////////////////////////////////////////////////////
14     //
15     // Last changed : $Date: 2009-02-13 18:22:48 +0200 (Fri, 13 Feb 2009) $
16     // File revision : $Revision: 4 $
17     //
18     // $Id: cpu_detect_x86_win.cpp 62 2009-02-13 16:22:48Z oparviai $
19     //
20     ////////////////////////////////////////////////////////////////////////////////
21     //
22     // License :
23     //
24     // SoundTouch audio processing library
25     // Copyright (c) Olli Parviainen
26     //
27     // This library is free software; you can redistribute it and/or
28     // modify it under the terms of the GNU Lesser General Public
29     // License as published by the Free Software Foundation; either
30     // version 2.1 of the License, or (at your option) any later version.
31     //
32     // This library is distributed in the hope that it will be useful,
33     // but WITHOUT ANY WARRANTY; without even the implied warranty of
34     // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
35     // Lesser General Public License for more details.
36     //
37     // You should have received a copy of the GNU Lesser General Public
38     // License along with this library; if not, write to the Free Software
39     // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
40     //
41     ////////////////////////////////////////////////////////////////////////////////
42    
43     #include "cpu_detect.h"
44    
45     #ifndef WIN32
46     #error wrong platform - this source code file is exclusively for Win32 platform
47     #endif
48    
49     //////////////////////////////////////////////////////////////////////////////
50     //
51     // processor instructions extension detection routines
52     //
53     //////////////////////////////////////////////////////////////////////////////
54    
55     // Flag variable indicating whick ISA extensions are disabled (for debugging)
56     static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions
57    
58    
59     // Disables given set of instruction extensions. See SUPPORT_... defines.
60     void disableExtensions(uint dwDisableMask)
61     {
62     _dwDisabledISA = dwDisableMask;
63     }
64    
65    
66    
67     /// Checks which instruction set extensions are supported by the CPU.
68     uint detectCPUextensions(void)
69     {
70     uint res = 0;
71    
72     if (_dwDisabledISA == 0xffffffff) return 0;
73    
74     _asm
75     {
76     ; check if 'cpuid' instructions is available by toggling eflags bit 21
77     ;
78     xor esi, esi ; clear esi = result register
79    
80     pushfd ; save eflags to stack
81     mov eax,dword ptr [esp] ; load eax from stack (with eflags)
82     mov ecx, eax ; save the original eflags values to ecx
83     xor eax, 0x00200000 ; toggle bit 21
84     mov dword ptr [esp],eax ; store toggled eflags to stack
85     popfd ; load eflags from stack
86    
87     pushfd ; save updated eflags to stack
88     mov eax,dword ptr [esp] ; load eax from stack
89     popfd ; pop stack to restore stack pointer
90    
91     xor edx, edx ; clear edx for defaulting no mmx
92     cmp eax, ecx ; compare to original eflags values
93     jz end ; jumps to 'end' if cpuid not present
94    
95     ; cpuid instruction available, test for presence of mmx instructions
96     mov eax, 1
97     cpuid
98     test edx, 0x00800000
99     jz end ; branch if MMX not available
100    
101     or esi, SUPPORT_MMX ; otherwise add MMX support bit
102    
103     test edx, 0x02000000
104     jz test3DNow ; branch if SSE not available
105    
106     or esi, SUPPORT_SSE ; otherwise add SSE support bit
107    
108     test3DNow:
109     ; test for precense of AMD extensions
110     mov eax, 0x80000000
111     cpuid
112     cmp eax, 0x80000000
113     jbe end ; branch if no AMD extensions detected
114    
115     ; test for precense of 3DNow! extension
116     mov eax, 0x80000001
117     cpuid
118     test edx, 0x80000000
119     jz end ; branch if 3DNow! not detected
120    
121     or esi, SUPPORT_3DNOW ; otherwise add 3DNow support bit
122    
123     end:
124    
125     mov res, esi
126     }
127    
128     return res & ~_dwDisabledISA;
129     }

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