New single instruction math operation header

Originally committed as revision 6291 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/armv4l/mathops.h

@@ -0,0 +1,47 @@
+/*
+ * simple math operations
+ * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifdef FRAC_BITS
+#   define MULL(a, b) \
+        ({  int lo, hi;\
+         asm("smull %0, %1, %2, %3     \n\t"\
+             "mov   %0, %0,     lsr %4\n\t"\
+             "add   %1, %0, %1, lsl %5\n\t"\
+             : "=&r"(lo), "=&r"(hi)\
+             : "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\
+         hi; })
+#endif
+
+#define MULH(a, b) \
+    ({ int lo, hi;\
+     asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));\
+     hi; })
+
+#if defined(HAVE_ARMV5TE)
+
+/* signed 16x16 -> 32 multiply add accumulate */
+#   define MAC16(rt, ra, rb) \
+        asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
+/* signed 16x16 -> 32 multiply */
+#   define MUL16(ra, rb) \
+        ({ int __rt;\
+         asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb));
+         __rt; })
+
+#endif