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

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Revision 15 - (show annotations) (download)
Mon Sep 6 13:44:19 2010 UTC (10 years, 2 months ago) by william
File size: 4584 byte(s)
initial checkout of r3113 from upstream repository
1 ////////////////////////////////////////////////////////////////////////////////
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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