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Member "pulseaudio-13.0/src/pulsecore/cpu-x86.c" (20 Nov 2018, 3723 Bytes) of package /linux/misc/pulseaudio-13.0.tar.xz:


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    1 /***
    2   This file is part of PulseAudio.
    3 
    4   Copyright 2004-2006 Lennart Poettering
    5   Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
    6 
    7   PulseAudio is free software; you can redistribute it and/or modify
    8   it under the terms of the GNU Lesser General Public License as published
    9   by the Free Software Foundation; either version 2.1 of the License,
   10   or (at your option) any later version.
   11 
   12   PulseAudio is distributed in the hope that it will be useful, but
   13   WITHOUT ANY WARRANTY; without even the implied warranty of
   14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   15   General Public License for more details.
   16 
   17   You should have received a copy of the GNU Lesser General Public License
   18   along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
   19 ***/
   20 
   21 #ifdef HAVE_CONFIG_H
   22 #include <config.h>
   23 #endif
   24 
   25 #include <stdint.h>
   26 
   27 #ifdef HAVE_CPUID_H
   28 #include <cpuid.h>
   29 #endif
   30 
   31 #include <pulsecore/log.h>
   32 
   33 #include "cpu-x86.h"
   34 
   35 void pa_cpu_get_x86_flags(pa_cpu_x86_flag_t *flags) {
   36 #if (defined(__i386__) || defined(__amd64__)) && defined(HAVE_CPUID_H)
   37     uint32_t eax, ebx, ecx, edx;
   38     uint32_t level;
   39 
   40     *flags = 0;
   41 
   42     /* get standard level */
   43     if (__get_cpuid(0x00000000, &level, &ebx, &ecx, &edx) == 0)
   44         goto finish;
   45 
   46     if (level >= 1) {
   47         if (__get_cpuid(0x00000001, &eax, &ebx, &ecx, &edx) == 0)
   48             goto finish;
   49 
   50         if (edx & (1<<15))
   51           *flags |= PA_CPU_X86_CMOV;
   52 
   53         if (edx & (1<<23))
   54           *flags |= PA_CPU_X86_MMX;
   55 
   56         if (edx & (1<<25))
   57           *flags |= PA_CPU_X86_SSE;
   58 
   59         if (edx & (1<<26))
   60           *flags |= PA_CPU_X86_SSE2;
   61 
   62         if (ecx & (1<<0))
   63           *flags |= PA_CPU_X86_SSE3;
   64 
   65         if (ecx & (1<<9))
   66           *flags |= PA_CPU_X86_SSSE3;
   67 
   68         if (ecx & (1<<19))
   69           *flags |= PA_CPU_X86_SSE4_1;
   70 
   71         if (ecx & (1<<20))
   72           *flags |= PA_CPU_X86_SSE4_2;
   73     }
   74 
   75     /* get extended level */
   76     if (__get_cpuid(0x80000000, &level, &ebx, &ecx, &edx) == 0)
   77         goto finish;
   78 
   79     if (level >= 0x80000001) {
   80         if (__get_cpuid(0x80000001, &eax, &ebx, &ecx, &edx) == 0)
   81             goto finish;
   82 
   83         if (edx & (1<<22))
   84           *flags |= PA_CPU_X86_MMXEXT;
   85 
   86         if (edx & (1<<23))
   87           *flags |= PA_CPU_X86_MMX;
   88 
   89         if (edx & (1<<30))
   90           *flags |= PA_CPU_X86_3DNOWEXT;
   91 
   92         if (edx & (1<<31))
   93           *flags |= PA_CPU_X86_3DNOW;
   94     }
   95 
   96 finish:
   97     pa_log_info("CPU flags: %s%s%s%s%s%s%s%s%s%s%s",
   98     (*flags & PA_CPU_X86_CMOV) ? "CMOV " : "",
   99     (*flags & PA_CPU_X86_MMX) ? "MMX " : "",
  100     (*flags & PA_CPU_X86_SSE) ? "SSE " : "",
  101     (*flags & PA_CPU_X86_SSE2) ? "SSE2 " : "",
  102     (*flags & PA_CPU_X86_SSE3) ? "SSE3 " : "",
  103     (*flags & PA_CPU_X86_SSSE3) ? "SSSE3 " : "",
  104     (*flags & PA_CPU_X86_SSE4_1) ? "SSE4_1 " : "",
  105     (*flags & PA_CPU_X86_SSE4_2) ? "SSE4_2 " : "",
  106     (*flags & PA_CPU_X86_MMXEXT) ? "MMXEXT " : "",
  107     (*flags & PA_CPU_X86_3DNOW) ? "3DNOW " : "",
  108     (*flags & PA_CPU_X86_3DNOWEXT) ? "3DNOWEXT " : "");
  109 #endif /* (defined(__i386__) || defined(__amd64__)) && defined(HAVE_CPUID_H) */
  110 }
  111 
  112 bool pa_cpu_init_x86(pa_cpu_x86_flag_t *flags) {
  113 #if defined (__i386__) || defined (__amd64__)
  114     pa_cpu_get_x86_flags(flags);
  115 
  116     /* activate various optimisations */
  117     if (*flags & PA_CPU_X86_MMX) {
  118         pa_volume_func_init_mmx(*flags);
  119         pa_remap_func_init_mmx(*flags);
  120     }
  121 
  122     if (*flags & (PA_CPU_X86_SSE | PA_CPU_X86_SSE2)) {
  123         pa_volume_func_init_sse(*flags);
  124         pa_remap_func_init_sse(*flags);
  125         pa_convert_func_init_sse(*flags);
  126     }
  127 
  128     return true;
  129 #else /* defined (__i386__) || defined (__amd64__) */
  130     return false;
  131 #endif /* defined (__i386__) || defined (__amd64__) */
  132 }