/[pcsx2_0.9.7]/trunk/3rdparty/SoundTouch/cpu_detect_x86_gcc.cpp
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Contents of /trunk/3rdparty/SoundTouch/cpu_detect_x86_gcc.cpp

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Revision 8 - (show annotations) (download)
Mon Sep 6 11:19:43 2010 UTC (9 years, 4 months ago) by william
File size: 5095 byte(s)
Exported ./upsream/trunk @r3730 from http://pcsx2.googlecode.com/svn/trunk/
1 ////////////////////////////////////////////////////////////////////////////////
2 ///
3 /// Generic version of the x86 CPU extension detection routine.
4 ///
5 /// This file is for GNU & other non-Windows compilers, see 'cpu_detect_x86_win.cpp'
6 /// for the Microsoft compiler version.
7 ///
8 /// Author : Copyright (c) Olli Parviainen
9 /// Author e-mail : oparviai 'at' iki.fi
10 /// SoundTouch WWW: http://www.surina.net/soundtouch
11 ///
12 ////////////////////////////////////////////////////////////////////////////////
13 //
14 // Last changed : $Date: 2009-02-25 19:13:51 +0200 (Wed, 25 Feb 2009) $
15 // File revision : $Revision: 4 $
16 //
17 // $Id: cpu_detect_x86_gcc.cpp 67 2009-02-25 17:13:51Z oparviai $
18 //
19 ////////////////////////////////////////////////////////////////////////////////
20 //
21 // License :
22 //
23 // SoundTouch audio processing library
24 // Copyright (c) Olli Parviainen
25 //
26 // This library is free software; you can redistribute it and/or
27 // modify it under the terms of the GNU Lesser General Public
28 // License as published by the Free Software Foundation; either
29 // version 2.1 of the License, or (at your option) any later version.
30 //
31 // This library is distributed in the hope that it will be useful,
32 // but WITHOUT ANY WARRANTY; without even the implied warranty of
33 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
34 // Lesser General Public License for more details.
35 //
36 // You should have received a copy of the GNU Lesser General Public
37 // License along with this library; if not, write to the Free Software
38 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
39 //
40 ////////////////////////////////////////////////////////////////////////////////
41
42 #include <stdexcept>
43 #include <string>
44 #include "cpu_detect.h"
45 #include "STTypes.h"
46
47 using namespace std;
48
49 #include <stdio.h>
50
51 //////////////////////////////////////////////////////////////////////////////
52 //
53 // processor instructions extension detection routines
54 //
55 //////////////////////////////////////////////////////////////////////////////
56
57 // Flag variable indicating whick ISA extensions are disabled (for debugging)
58 static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions
59
60 // Disables given set of instruction extensions. See SUPPORT_... defines.
61 void disableExtensions(uint dwDisableMask)
62 {
63 _dwDisabledISA = dwDisableMask;
64 }
65
66
67
68 /// Checks which instruction set extensions are supported by the CPU.
69 uint detectCPUextensions(void)
70 {
71 #if (!(ALLOW_X86_OPTIMIZATIONS) || !(__GNUC__))
72
73 return 0; // always disable extensions on non-x86 platforms.
74
75 #else
76 uint res = 0;
77
78 if (_dwDisabledISA == 0xffffffff) return 0;
79
80 asm volatile(
81 "\n\txor %%esi, %%esi" // clear %%esi = result register
82 // check if 'cpuid' instructions is available by toggling eflags bit 21
83
84 "\n\tpushf" // save eflags to stack
85 "\n\tmovl (%%esp), %%eax" // load eax from stack (with eflags)
86 "\n\tmovl %%eax, %%ecx" // save the original eflags values to ecx
87 "\n\txor $0x00200000, %%eax" // toggle bit 21
88 "\n\tmovl %%eax, (%%esp)" // store toggled eflags to stack
89 "\n\tpopf" // load eflags from stack
90 "\n\tpushf" // save updated eflags to stack
91 "\n\tmovl (%%esp), %%eax" // load eax from stack
92 "\n\tpopf" // pop stack to restore esp
93 "\n\txor %%edx, %%edx" // clear edx for defaulting no mmx
94 "\n\tcmp %%ecx, %%eax" // compare to original eflags values
95 "\n\tjz end" // jumps to 'end' if cpuid not present
96 // cpuid instruction available, test for presence of mmx instructions
97
98 "\n\tmovl $1, %%eax"
99 "\n\tcpuid"
100 "\n\ttest $0x00800000, %%edx"
101 "\n\tjz end" // branch if MMX not available
102
103 "\n\tor $0x01, %%esi" // otherwise add MMX support bit
104
105 "\n\ttest $0x02000000, %%edx"
106 "\n\tjz test3DNow" // branch if SSE not available
107
108 "\n\tor $0x08, %%esi" // otherwise add SSE support bit
109
110 "\n\ttest3DNow:"
111 // test for precense of AMD extensions
112 "\n\tmov $0x80000000, %%eax"
113 "\n\tcpuid"
114 "\n\tcmp $0x80000000, %%eax"
115 "\n\tjbe end" // branch if no AMD extensions detected
116
117 // test for precense of 3DNow! extension
118 "\n\tmov $0x80000001, %%eax"
119 "\n\tcpuid"
120 "\n\ttest $0x80000000, %%edx"
121 "\n\tjz end" // branch if 3DNow! not detected
122
123 "\n\tor $0x02, %%esi" // otherwise add 3DNow support bit
124
125 "\n\tend:"
126
127 "\n\tmov %%esi, %0"
128
129 : "=r" (res)
130 : /* no inputs */
131 : "%edx", "%eax", "%ecx", "%esi" );
132
133 return res & ~_dwDisabledISA;
134 #endif
135 }

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