Rename libavcodec/i386/ --> libavcodec/x86/.

It contains optimizations that are not specific to i386 and
libavutil uses this naming scheme already.

Originally committed as revision 16270 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/x86/mathops.h

@@ -0,0 +1,43 @@
+/*
+ * simple math operations
+ * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_X86_MATHOPS_H
+#define AVCODEC_X86_MATHOPS_H
+
+#define MULL(ra, rb, shift) \
+        ({ int rt, dummy; __asm__ (\
+            "imull %3               \n\t"\
+            "shrdl %4, %%edx, %%eax \n\t"\
+            : "=a"(rt), "=d"(dummy)\
+            : "a" ((int)ra), "rm" ((int)rb), "i"(shift));\
+         rt; })
+
+#define MULH(ra, rb) \
+    ({ int rt, dummy;\
+     __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\
+     rt; })
+
+#define MUL64(ra, rb) \
+    ({ int64_t rt;\
+     __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\
+     rt; })
+
+#endif /* AVCODEC_X86_MATHOPS_H */