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	schoenebeck	320	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	schoenebeck	579	* Copyright (C) 2005 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			#if ARCH_X86
27			bool Features::bMMX(false);
28			bool Features::bSSE(false);
29	persson	425	bool Features::bSSE2(false);
30	schoenebeck	320
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	schoenebeck	579	__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	schoenebeck	320	bMMX = (edx & 0x00800000);
53			bSSE = (edx & 0x02000000);
54	persson	425	bSSE2 = (edx & 0x04000000);
55	schoenebeck	320	}
56	schoenebeck	361	#else
57			void Features::detect() {}
58	schoenebeck	320	#endif // ARCH_X86
59	schoenebeck	579
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			}