/[svn]/linuxsampler/trunk/src/common/Features.cpp
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Diff of /linuxsampler/trunk/src/common/Features.cpp

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revision 425 by persson, Sat Mar 5 07:27:48 2005 UTC revision 579 by schoenebeck, Tue May 24 19:20:20 2005 UTC
# Line 3  Line 3 
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
6     *   Copyright (C) 2005 Christian Schoenebeck                              *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This program is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 35  unsigned int edx_temp = 0; Line 36  unsigned int edx_temp = 0;
36    
37  void Features::detect() {  void Features::detect() {
38      // we store and restore all registers modified by 'cpuid' the old fashioned way      // we store and restore all registers modified by 'cpuid' the old fashioned way
39      __asm__ __volatile__ ("mov %eax,eax_temp\n\t"      __asm__ __volatile__ (
40                            "mov %ebx,ebx_temp\n\t"          "mov %eax,eax_temp\n\t"
41                            "mov %ecx,ecx_temp\n\t"          "mov %ebx,ebx_temp\n\t"
42                            "mov %edx,edx_temp\n\t"          "mov %ecx,ecx_temp\n\t"
43                            "mov $1,%eax\n\t"          "mov %edx,edx_temp\n\t"
44                            "cpuid\n\t"          "mov $1,%eax\n\t"
45                            "mov %edx,edx\n\t"          "cpuid\n\t"
46                            "mov eax_temp,%eax\n\t"          "mov %edx,edx\n\t"
47                            "mov ebx_temp,%ebx\n\t"          "mov eax_temp,%eax\n\t"
48                            "mov ecx_temp,%ecx\n\t"          "mov ebx_temp,%ebx\n\t"
49                            "mov edx_temp,%edx\n\t"          "mov ecx_temp,%ecx\n\t"
50                           );          "mov edx_temp,%edx\n\t"
51        );
52      bMMX = (edx & 0x00800000);      bMMX = (edx & 0x00800000);
53      bSSE = (edx & 0x02000000);      bSSE = (edx & 0x02000000);
54      bSSE2 = (edx & 0x04000000);      bSSE2 = (edx & 0x04000000);
# Line 54  void Features::detect() { Line 56  void Features::detect() {
56  #else  #else
57  void Features::detect() {}  void Features::detect() {}
58  #endif // ARCH_X86  #endif // ARCH_X86
59    
60    void Features::enableDenormalsAreZeroMode() {
61        #if ARCH_X86
62        if (supportsSSE2()) {
63            int x;
64            __asm__ __volatile__ (
65                "stmxcsr %0\n\t"
66                "movl    %0, %%eax\n\t"
67                "orl     $0x40, %%eax\n\t"
68                "movl    %%eax, %0\n\t"
69                "ldmxcsr %0\n\t"
70                :: "m" (x)
71                : "%eax"
72            );
73        }
74        #endif // ARCH_X86
75    }
76    
77    String Features::featuresAsString() {
78        String sFeatures = "none";
79        #if ARCH_X86    
80        if (supportsMMX())  sFeatures  =  "MMX";
81        if (supportsSSE())  sFeatures += " SSE";
82        if (supportsSSE2()) sFeatures += " SSE2";
83        #endif // ARCH_X86
84        return sFeatures;
85    }
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