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

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Revision 10 - (hide annotations) (download)
Mon Sep 6 11:40:06 2010 UTC (9 years, 5 months ago) by william
File size: 5095 byte(s)
exported r3113 from ./upstream/trunk
1 william 10 ////////////////////////////////////////////////////////////////////////////////
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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