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	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 - 2007 Christian Schoenebeck *
7	* *
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	#if CONFIG_ASM && ARCH_X86
27	bool Features::bMMX(false);
28	bool Features::bSSE(false);
29	bool Features::bSSE2(false);
30
31	void Features::detect() {
32	int edx;
33	__asm__ __volatile__ (
34	"movl %%ebx,%%edi\n\t" /save PIC register/
35	"movl $1,%%eax\n\t"
36	"cpuid\n\t"
37	"movl %%edi,%%ebx\n\t" /restore PIC register/
38	: "=d" (edx)
39	: : "%eax", "%ecx", "%edi"
40	);
41	bMMX = (edx & 0x00800000);
42	bSSE = (edx & 0x02000000);
43	bSSE2 = (edx & 0x04000000);
44	}
45	#else
46	void Features::detect() {}
47	#endif // CONFIG_ASM && ARCH_X86
48
49	void Features::enableDenormalsAreZeroMode() {
50	#if CONFIG_ASM && ARCH_X86
51	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	#endif // CONFIG_ASM && ARCH_X86
64	}
65
66	String Features::featuresAsString() {
67	String sFeatures = "none";
68	#if CONFIG_ASM && ARCH_X86
69	if (supportsMMX()) sFeatures = "MMX";
70	if (supportsSSE()) sFeatures += " SSE";
71	if (supportsSSE2()) sFeatures += " SSE2";
72	#else
73	sFeatures = "disabled at compile time";
74	#endif // CONFIG_ASM && ARCH_X86
75	return sFeatures;
76	}