/[svn]/linuxsampler/trunk/src/common/Features.cpp
ViewVC logotype

Annotation of /linuxsampler/trunk/src/common/Features.cpp

Parent Directory Parent Directory | Revision Log Revision Log


Revision 1723 - (hide annotations) (download)
Sun Apr 20 08:53:39 2008 UTC (12 years, 2 months ago) by schoenebeck
File size: 3094 byte(s)
* allow pan control of engine channels on C++ API level
* export denormals-are-zero mode feature to C++ API

1 schoenebeck 320 /***************************************************************************
2     * *
3     * LinuxSampler - modular, streaming capable sampler *
4     * *
5     * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 schoenebeck 1723 * Copyright (C) 2005 - 2008 Christian Schoenebeck *
7 schoenebeck 320 * *
8     * 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 *
10     * the Free Software Foundation; either version 2 of the License, or *
11     * (at your option) any later version. *
12     * *
13     * This program is distributed in the hope that it will be useful, *
14     * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16     * GNU General Public License for more details. *
17     * *
18     * You should have received a copy of the GNU General Public License *
19     * along with this program; if not, write to the Free Software *
20     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21     * MA 02111-1307 USA *
22     ***************************************************************************/
23    
24     #include "Features.h"
25    
26 schoenebeck 617 #if CONFIG_ASM && ARCH_X86
27 schoenebeck 320 bool Features::bMMX(false);
28     bool Features::bSSE(false);
29 persson 425 bool Features::bSSE2(false);
30 schoenebeck 320
31     void Features::detect() {
32 schoenebeck 1314 int edx;
33 schoenebeck 579 __asm__ __volatile__ (
34 schoenebeck 1314 "movl %%ebx,%%edi\n\t" /*save PIC register*/
35     "movl $1,%%eax\n\t"
36 schoenebeck 579 "cpuid\n\t"
37 schoenebeck 1314 "movl %%edi,%%ebx\n\t" /*restore PIC register*/
38     : "=d" (edx)
39     : : "%eax", "%ecx", "%edi"
40 schoenebeck 579 );
41 schoenebeck 320 bMMX = (edx & 0x00800000);
42     bSSE = (edx & 0x02000000);
43 persson 425 bSSE2 = (edx & 0x04000000);
44 schoenebeck 320 }
45 schoenebeck 361 #else
46     void Features::detect() {}
47 schoenebeck 617 #endif // CONFIG_ASM && ARCH_X86
48 schoenebeck 579
49 schoenebeck 1723 bool Features::enableDenormalsAreZeroMode() {
50 schoenebeck 617 #if CONFIG_ASM && ARCH_X86
51 schoenebeck 579 if (supportsSSE2()) {
52     int x;
53     __asm__ __volatile__ (
54     "stmxcsr %0\n\t"
55     "movl %0, %%eax\n\t"
56     "orl $0x40, %%eax\n\t"
57     "movl %%eax, %0\n\t"
58     "ldmxcsr %0\n\t"
59     :: "m" (x)
60     : "%eax"
61     );
62 schoenebeck 1723 return true;
63 schoenebeck 579 }
64 schoenebeck 1723 return false;
65 schoenebeck 617 #endif // CONFIG_ASM && ARCH_X86
66 schoenebeck 579 }
67    
68     String Features::featuresAsString() {
69     String sFeatures = "none";
70 schoenebeck 617 #if CONFIG_ASM && ARCH_X86
71 schoenebeck 579 if (supportsMMX()) sFeatures = "MMX";
72     if (supportsSSE()) sFeatures += " SSE";
73     if (supportsSSE2()) sFeatures += " SSE2";
74 schoenebeck 617 #else
75     sFeatures = "disabled at compile time";
76     #endif // CONFIG_ASM && ARCH_X86
77 schoenebeck 579 return sFeatures;
78     }

  ViewVC Help
Powered by ViewVC