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libavcodec/x86/mathops.h

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00001 /*
00002  * simple math operations
00003  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #ifndef AVCODEC_X86_MATHOPS_H
00023 #define AVCODEC_X86_MATHOPS_H
00024 
00025 #include "config.h"
00026 #include "libavutil/common.h"
00027 
00028 #if ARCH_X86_32
00029 #define MULL(ra, rb, shift) \
00030         ({ int rt, dummy; __asm__ (\
00031             "imull %3               \n\t"\
00032             "shrdl %4, %%edx, %%eax \n\t"\
00033             : "=a"(rt), "=d"(dummy)\
00034             : "a" ((int)(ra)), "rm" ((int)(rb)), "i"(shift));\
00035          rt; })
00036 
00037 #define MULH(ra, rb) \
00038     ({ int rt, dummy;\
00039      __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)(ra)), "rm" ((int)(rb)));\
00040      rt; })
00041 
00042 #define MUL64(ra, rb) \
00043     ({ int64_t rt;\
00044      __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)(ra)), "g" ((int)(rb)));\
00045      rt; })
00046 #endif
00047 
00048 #if HAVE_CMOV
00049 /* median of 3 */
00050 #define mid_pred mid_pred
00051 static inline av_const int mid_pred(int a, int b, int c)
00052 {
00053     int i=b;
00054     __asm__ volatile(
00055         "cmp    %2, %1 \n\t"
00056         "cmovg  %1, %0 \n\t"
00057         "cmovg  %2, %1 \n\t"
00058         "cmp    %3, %1 \n\t"
00059         "cmovl  %3, %1 \n\t"
00060         "cmp    %1, %0 \n\t"
00061         "cmovg  %1, %0 \n\t"
00062         :"+&r"(i), "+&r"(a)
00063         :"r"(b), "r"(c)
00064     );
00065     return i;
00066 }
00067 #endif
00068 
00069 #if HAVE_CMOV
00070 #define COPY3_IF_LT(x, y, a, b, c, d)\
00071 __asm__ volatile(\
00072     "cmpl  %0, %3       \n\t"\
00073     "cmovl %3, %0       \n\t"\
00074     "cmovl %4, %1       \n\t"\
00075     "cmovl %5, %2       \n\t"\
00076     : "+&r" (x), "+&r" (a), "+r" (c)\
00077     : "r" (y), "r" (b), "r" (d)\
00078 );
00079 #endif
00080 
00081 // avoid +32 for shift optimization (gcc should do that ...)
00082 #define NEG_SSR32 NEG_SSR32
00083 static inline  int32_t NEG_SSR32( int32_t a, int8_t s){
00084     __asm__ ("sarl %1, %0\n\t"
00085          : "+r" (a)
00086          : "ic" ((uint8_t)(-s))
00087     );
00088     return a;
00089 }
00090 
00091 #define NEG_USR32 NEG_USR32
00092 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
00093     __asm__ ("shrl %1, %0\n\t"
00094          : "+r" (a)
00095          : "ic" ((uint8_t)(-s))
00096     );
00097     return a;
00098 }
00099 
00100 #endif /* AVCODEC_X86_MATHOPS_H */

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