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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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18964cbfac
Original commit message from CVS: Redid the cpu detection with a little help from mpeg2decs code..
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstcpu.c: CPU detection and architecture-specific routines
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <glib.h>
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#include "gst_private.h"
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#include "gstcpu.h"
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static guint32 _gst_cpu_flags;
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#ifdef HAVE_CPU_I386
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void gst_cpuid_i386(int,long *,long *,long *,long *);
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#define gst_cpuid gst_cpuid_i386
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#else
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#define gst_cpuid(o,a,b,c,d) (void)(a);(void)(b);(void)(c);
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#endif
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static gchar *stringcat (gchar *a,gchar *b) {
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gchar *c;
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if (a) {
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c = g_strconcat(a,b,NULL);
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g_free (a);
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} else {
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c = g_strdup(b);
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}
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return c;
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}
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void
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_gst_cpu_initialize (void)
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{
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gchar *featurelist = NULL;
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gboolean AMD;
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long eax=0, ebx=0, ecx=0, edx=0;
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gst_cpuid(0, &eax, &ebx, &ecx, &edx);
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AMD = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);
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gst_cpuid(1, &eax, &ebx, &ecx, &edx);
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if (edx & (1<<23)) {
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_gst_cpu_flags |= GST_CPU_FLAG_MMX;
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featurelist = stringcat(featurelist,"MMX ");
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if (edx & (1<<25)) {
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_gst_cpu_flags |= GST_CPU_FLAG_SSE;
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_gst_cpu_flags |= GST_CPU_FLAG_MMXEXT;
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featurelist = stringcat(featurelist,"SSE ");
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}
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gst_cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
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if (eax >= 0x80000001) {
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gst_cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
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if (edx & (1<<31)) {
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_gst_cpu_flags |= GST_CPU_FLAG_3DNOW;
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featurelist = stringcat(featurelist,"3DNOW ");
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}
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if (AMD && (edx & (1<<22))) {
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_gst_cpu_flags |= GST_CPU_FLAG_MMXEXT;
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featurelist = stringcat(featurelist,"MMXEXT ");
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}
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}
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}
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if (!_gst_cpu_flags) {
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featurelist = stringcat(featurelist,"NONE");
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}
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GST_INFO (GST_CAT_GST_INIT, "CPU features: (%08lx) %s",edx, featurelist);
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g_free(featurelist);
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}
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GstCPUFlags
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gst_cpu_get_flags (void)
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{
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return _gst_cpu_flags;
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}
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