Rename i386/cputest.c --> i386/cpuid.c.

Originally committed as revision 13002 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 127 insertions, 0 deletions

diff --git a/libavcodec/i386/cpuid.c b/libavcodec/i386/cpuid.c
new file mode 100644
index 0000000000..879d36cd38
--- /dev/null
+++ b/libavcodec/i386/cpuid.c
@@ -0,0 +1,127 @@
+/*
+ * CPU detection code, extracted from mmx.h
+ * (c)1997-99 by H. Dietz and R. Fisher
+ * Converted to C and improved by Fabrice Bellard.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include "dsputil.h"
+#include "x86_cpu.h"
+
+#undef printf
+
+/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
+#define cpuid(index,eax,ebx,ecx,edx)\
+    asm volatile\
+        ("mov %%"REG_b", %%"REG_S"\n\t"\
+         "cpuid\n\t"\
+         "xchg %%"REG_b", %%"REG_S\
+         : "=a" (eax), "=S" (ebx),\
+           "=c" (ecx), "=d" (edx)\
+         : "0" (index));
+
+/* Function to test if multimedia instructions are supported...  */
+int mm_support(void)
+{
+    int rval = 0;
+    int eax, ebx, ecx, edx;
+    int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
+    long a, c;
+
+    asm volatile (
+        /* See if CPUID instruction is supported ... */
+        /* ... Get copies of EFLAGS into eax and ecx */
+        "pushf\n\t"
+        "pop %0\n\t"
+        "mov %0, %1\n\t"
+
+        /* ... Toggle the ID bit in one copy and store */
+        /*     to the EFLAGS reg */
+        "xor $0x200000, %0\n\t"
+        "push %0\n\t"
+        "popf\n\t"
+
+        /* ... Get the (hopefully modified) EFLAGS */
+        "pushf\n\t"
+        "pop %0\n\t"
+        : "=a" (a), "=c" (c)
+        :
+        : "cc"
+        );
+
+    if (a == c)
+        return 0; /* CPUID not supported */
+
+    cpuid(0, max_std_level, ebx, ecx, edx);
+
+    if(max_std_level >= 1){
+        cpuid(1, eax, ebx, ecx, std_caps);
+        if (std_caps & (1<<23))
+            rval |= FF_MM_MMX;
+        if (std_caps & (1<<25))
+            rval |= FF_MM_MMXEXT
+#if !defined(__GNUC__) || __GNUC__ > 2
+                  | FF_MM_SSE;
+        if (std_caps & (1<<26))
+            rval |= FF_MM_SSE2;
+        if (ecx & 1)
+            rval |= FF_MM_SSE3;
+        if (ecx & 0x00000200 )
+            rval |= FF_MM_SSSE3
+#endif
+                  ;
+    }
+
+    cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
+
+    if(max_ext_level >= 0x80000001){
+        cpuid(0x80000001, eax, ebx, ecx, ext_caps);
+        if (ext_caps & (1<<31))
+            rval |= FF_MM_3DNOW;
+        if (ext_caps & (1<<30))
+            rval |= FF_MM_3DNOWEXT;
+        if (ext_caps & (1<<23))
+            rval |= FF_MM_MMX;
+        if (ext_caps & (1<<22))
+            rval |= FF_MM_MMXEXT;
+    }
+
+#if 0
+    av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s\n",
+        (rval&FF_MM_MMX) ? "MMX ":"",
+        (rval&FF_MM_MMXEXT) ? "MMX2 ":"",
+        (rval&FF_MM_SSE) ? "SSE ":"",
+        (rval&FF_MM_SSE2) ? "SSE2 ":"",
+        (rval&FF_MM_SSE3) ? "SSE3 ":"",
+        (rval&FF_MM_SSSE3) ? "SSSE3 ":"",
+        (rval&FF_MM_3DNOW) ? "3DNow ":"",
+        (rval&FF_MM_3DNOWEXT) ? "3DNowExt ":"");
+#endif
+    return rval;
+}
+
+#ifdef TEST
+int main ( void )
+{
+    int mm_flags;
+    mm_flags = mm_support();
+    printf("mm_support = 0x%08X\n",mm_flags);
+    return 0;
+}
+#endif