AVR32: optimised mathops.h

44% faster MP3 decoding

Originally committed as revision 19667 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 100 insertions, 0 deletions

diff --git a/libavcodec/avr32/mathops.h b/libavcodec/avr32/mathops.h
new file mode 100644
index 0000000000..f39aa8800f
--- /dev/null
+++ b/libavcodec/avr32/mathops.h
@@ -0,0 +1,100 @@
+/*
+ * Simple math operations
+ * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
+ *
+ * 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_AVR32_MATHOPS_H
+#define AVCODEC_AVR32_MATHOPS_H
+
+#include <stdint.h>
+#include "libavutil/common.h"
+
+#if HAVE_INLINE_ASM
+
+#define MULL MULL
+static inline av_const int MULL(int a, int b, unsigned shift)
+{
+    union { int64_t x; int hl[2]; } x;
+    __asm__ ("muls.d %0, %1, %2       \n\t"
+             "lsr    %0, %3           \n\t"
+             "or     %0, %0, %m0<<%4  \n\t"
+             : "=r"(x) : "r"(b), "r"(a), "i"(shift), "i"(32-shift));
+    return x.hl[1];
+}
+
+#define MULH MULH
+static inline av_const int MULH(int a, int b)
+{
+    union { int64_t x; int hl[2]; } x;
+    __asm__ ("muls.d %0, %1, %2" : "=r"(x.x) : "r"(a), "r"(b));
+    return x.hl[0];
+}
+
+#define MUL64 MUL64
+static inline av_const int64_t MUL64(int a, int b)
+{
+    int64_t x;
+    __asm__ ("muls.d %0, %1, %2" : "=r"(x) : "r"(a), "r"(b));
+    return x;
+}
+
+static inline av_const int64_t MAC64(int64_t d, int a, int b)
+{
+    __asm__ ("macs.d %0, %1, %2" : "+r"(d) : "r"(a), "r"(b));
+    return d;
+}
+#define MAC64(d, a, b) ((d) = MAC64(d, a, b))
+#define MLS64(d, a, b) MAC64(d, -(a), b)
+
+static inline av_const int MAC16(int d, int a, int b)
+{
+    __asm__ ("machh.w %0, %1:b, %2:b" : "+r"(d) : "r"(a), "r"(b));
+    return d;
+}
+#define MAC16(d, a, b) ((d) = MAC16(d, a, b))
+#define MLS16(d, a, b) MAC16(d, -(a), b)
+
+#define MUL16 MUL16
+static inline av_const int MUL16(int a, int b)
+{
+    int d;
+    __asm__ ("mulhh.w %0, %1:b, %2:b" : "=r"(d) : "r"(a), "r"(b));
+    return d;
+}
+
+#define mid_pred mid_pred
+static inline av_const int mid_pred(int a, int b, int c)
+{
+    int m;
+    __asm__ ("mov   %0, %2  \n\t"
+             "cp.w  %1, %2  \n\t"
+             "movgt %0, %1  \n\t"
+             "movgt %1, %2  \n\t"
+             "cp.w  %1, %3  \n\t"
+             "movle %1, %3  \n\t"
+             "cp.w  %0, %1  \n\t"
+             "movgt %0, %1  \n\t"
+             : "=&r"(m), "+r"(a)
+             : "r"(b), "r"(c));
+    return m;
+}
+
+#endif /* HAVE_INLINE_ASM */
+
+#endif /* AVCODEC_AVR32_MATHOPS_H */