New single instruction math operation header

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

libavcodec/mathops.h

@@ -0,0 +1,67 @@
+/*
+ * simple math operations
+ * Copyright (c) 2001, 2002 Fabrice Bellard.
+ * 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
+ */
+#ifndef MATHOPS_H
+#define MATHOPS_H
+
+#ifdef ARCH_X86
+
+#include "i386/mathops.h"
+
+#elif defined(ARCH_ARMV4L)
+
+#include "armv4l/mathops.h"
+
+#elif defined(ARCH_PPC)
+
+#include "ppc/mathops.h"
+
+#endif
+
+/* generic implementation */
+
+#ifndef MULL
+#   define MULL(a,b) (((int64_t)(a) * (int64_t)(b)) >> FRAC_BITS)
+#endif
+
+#ifndef MULH
+//gcc 3.4 creates an incredibly bloated mess out of this
+//#    define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
+
+static always_inline int MULH(int a, int b){
+    return ((int64_t)(a) * (int64_t)(b))>>32;
+}
+#endif
+
+#ifndef MUL64
+#   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
+#endif
+
+/* signed 16x16 -> 32 multiply add accumulate */
+#ifndef MAC16
+#   define MAC16(rt, ra, rb) rt += (ra) * (rb)
+#endif
+
+/* signed 16x16 -> 32 multiply */
+#ifndef MUL16
+#   define MUL16(ra, rb) ((ra) * (rb))
+#endif
+
+#endif //MATHOPS_H
+