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/*************************************************************************** |
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* * |
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* LinuxSampler - modular, streaming capable sampler * |
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* * |
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* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
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* Copyright (C) 2005 Christian Schoenebeck * |
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* * |
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* This program is free software; you can redistribute it and/or modify * |
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* it under the terms of the GNU General Public License as published by * |
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* the Free Software Foundation; either version 2 of the License, or * |
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* (at your option) any later version. * |
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* * |
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* This program is distributed in the hope that it will be useful, * |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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* along with this program; if not, write to the Free Software * |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
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* MA 02111-1307 USA * |
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***************************************************************************/ |
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|
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#include "Features.h" |
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|
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#if CONFIG_ASM && ARCH_X86 |
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bool Features::bMMX(false); |
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bool Features::bSSE(false); |
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bool Features::bSSE2(false); |
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|
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unsigned int edx = 0; |
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unsigned int eax_temp = 0; |
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unsigned int ebx_temp = 0; |
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unsigned int ecx_temp = 0; |
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unsigned int edx_temp = 0; |
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|
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void Features::detect() { |
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// we store and restore all registers modified by 'cpuid' the old fashioned way |
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__asm__ __volatile__ ( |
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"mov %eax,eax_temp\n\t" |
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"mov %ebx,ebx_temp\n\t" |
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"mov %ecx,ecx_temp\n\t" |
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"mov %edx,edx_temp\n\t" |
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"mov $1,%eax\n\t" |
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"cpuid\n\t" |
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"mov %edx,edx\n\t" |
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"mov eax_temp,%eax\n\t" |
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"mov ebx_temp,%ebx\n\t" |
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"mov ecx_temp,%ecx\n\t" |
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"mov edx_temp,%edx\n\t" |
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); |
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bMMX = (edx & 0x00800000); |
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bSSE = (edx & 0x02000000); |
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bSSE2 = (edx & 0x04000000); |
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} |
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#else |
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void Features::detect() {} |
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#endif // CONFIG_ASM && ARCH_X86 |
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|
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void Features::enableDenormalsAreZeroMode() { |
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#if CONFIG_ASM && ARCH_X86 |
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if (supportsSSE2()) { |
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int x; |
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__asm__ __volatile__ ( |
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"stmxcsr %0\n\t" |
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"movl %0, %%eax\n\t" |
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"orl $0x40, %%eax\n\t" |
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"movl %%eax, %0\n\t" |
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"ldmxcsr %0\n\t" |
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:: "m" (x) |
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: "%eax" |
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); |
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} |
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#endif // CONFIG_ASM && ARCH_X86 |
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} |
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|
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String Features::featuresAsString() { |
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String sFeatures = "none"; |
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#if CONFIG_ASM && ARCH_X86 |
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if (supportsMMX()) sFeatures = "MMX"; |
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if (supportsSSE()) sFeatures += " SSE"; |
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if (supportsSSE2()) sFeatures += " SSE2"; |
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#else |
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sFeatures = "disabled at compile time"; |
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#endif // CONFIG_ASM && ARCH_X86 |
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return sFeatures; |
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} |