src/common/Features.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#include "Features.h"

#if CONFIG_ASM && ARCH_X86
bool Features::bMMX(false);
bool Features::bSSE(false);
bool Features::bSSE2(false);

void Features::detect() {
    int edx;
    __asm__ __volatile__ (
        "movl %%ebx,%%edi\n\t" /*save PIC register*/
        "movl $1,%%eax\n\t"
        "cpuid\n\t"
        "movl %%edi,%%ebx\n\t" /*restore PIC register*/
        : "=d" (edx)
        : : "%eax", "%ecx", "%edi"
    );
    bMMX = (edx & 0x00800000);
    bSSE = (edx & 0x02000000);
    bSSE2 = (edx & 0x04000000);
}
#else
void Features::detect() {}
#endif // CONFIG_ASM && ARCH_X86

void Features::enableDenormalsAreZeroMode() {
    #if CONFIG_ASM && ARCH_X86
    if (supportsSSE2()) {
        int x;
        __asm__ __volatile__ (
            "stmxcsr %0\n\t"
            "movl    %0, %%eax\n\t"
            "orl     $0x40, %%eax\n\t"
            "movl    %%eax, %0\n\t"
            "ldmxcsr %0\n\t"
            :: "m" (x)
            : "%eax"
        );
    }
    #endif // CONFIG_ASM && ARCH_X86
}

String Features::featuresAsString() {
    String sFeatures = "none";
    #if CONFIG_ASM && ARCH_X86    
    if (supportsMMX())  sFeatures  =  "MMX";
    if (supportsSSE())  sFeatures += " SSE";
    if (supportsSSE2()) sFeatures += " SSE2";
    #else
    sFeatures = "disabled at compile time";
    #endif // CONFIG_ASM && ARCH_X86
    return sFeatures;
}
1	schoenebeck	320	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	1314	* Copyright (C) 2005 - 2007 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			void 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			}
63	schoenebeck	617	#endif // CONFIG_ASM && ARCH_X86
64	schoenebeck	579	}
65
66			String Features::featuresAsString() {
67			String sFeatures = "none";
68	schoenebeck	617	#if CONFIG_ASM && ARCH_X86
69	schoenebeck	579	if (supportsMMX()) sFeatures = "MMX";
70			if (supportsSSE()) sFeatures += " SSE";
71			if (supportsSSE2()) sFeatures += " SSE2";
72	schoenebeck	617	#else
73			sFeatures = "disabled at compile time";
74			#endif // CONFIG_ASM && ARCH_X86
75	schoenebeck	579	return sFeatures;
76			}