src/common/Features.cpp

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 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 ARCH_X86
bool Features::bMMX(false);
bool Features::bSSE(false);
bool Features::bSSE2(false);

unsigned int edx = 0;
unsigned int eax_temp = 0;
unsigned int ebx_temp = 0;
unsigned int ecx_temp = 0;
unsigned int edx_temp = 0;

void Features::detect() {
    // we store and restore all registers modified by 'cpuid' the old fashioned way
    __asm__ __volatile__ (
        "mov %eax,eax_temp\n\t"
        "mov %ebx,ebx_temp\n\t"
        "mov %ecx,ecx_temp\n\t"
        "mov %edx,edx_temp\n\t"
        "mov $1,%eax\n\t"
        "cpuid\n\t"
        "mov %edx,edx\n\t"
        "mov eax_temp,%eax\n\t"
        "mov ebx_temp,%ebx\n\t"
        "mov ecx_temp,%ecx\n\t"
        "mov edx_temp,%edx\n\t"
    );
    bMMX = (edx & 0x00800000);
    bSSE = (edx & 0x02000000);
    bSSE2 = (edx & 0x04000000);
}
#else
void Features::detect() {}
#endif // ARCH_X86

void Features::enableDenormalsAreZeroMode() {
    #if 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 // ARCH_X86
}

String Features::featuresAsString() {
    String sFeatures = "none";
    #if ARCH_X86    
    if (supportsMMX())  sFeatures  =  "MMX";
    if (supportsSSE())  sFeatures += " SSE";
    if (supportsSSE2()) sFeatures += " SSE2";
    #endif // 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 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 ARCH_X86
27	bool Features::bMMX(false);
28	bool Features::bSSE(false);
29	bool Features::bSSE2(false);
30
31	unsigned int edx = 0;
32	unsigned int eax_temp = 0;
33	unsigned int ebx_temp = 0;
34	unsigned int ecx_temp = 0;
35	unsigned int edx_temp = 0;
36
37	void Features::detect() {
38	// we store and restore all registers modified by 'cpuid' the old fashioned way
39	__asm__ __volatile__ (
40	"mov %eax,eax_temp\n\t"
41	"mov %ebx,ebx_temp\n\t"
42	"mov %ecx,ecx_temp\n\t"
43	"mov %edx,edx_temp\n\t"
44	"mov $1,%eax\n\t"
45	"cpuid\n\t"
46	"mov %edx,edx\n\t"
47	"mov eax_temp,%eax\n\t"
48	"mov ebx_temp,%ebx\n\t"
49	"mov ecx_temp,%ecx\n\t"
50	"mov edx_temp,%edx\n\t"
51	);
52	bMMX = (edx & 0x00800000);
53	bSSE = (edx & 0x02000000);
54	bSSE2 = (edx & 0x04000000);
55	}
56	#else
57	void Features::detect() {}
58	#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	}