/* * simple math operations * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 #include "config.h" #include "libavutil/common.h" #if HAVE_INLINE_ASM #if ARCH_X86_32 #define MULL MULL static av_always_inline av_const int MULL(int a, int b, unsigned shift) { int rt, dummy; __asm__ ( "imull %3 \n\t" "shrdl %4, %%edx, %%eax \n\t" :"=a"(rt), "=d"(dummy) :"a"(a), "rm"(b), "ci"((uint8_t)shift) ); return rt; } #define MULH MULH static av_always_inline av_const int MULH(int a, int b) { int rt, dummy; __asm__ ( "imull %3" :"=d"(rt), "=a"(dummy) :"a"(a), "rm"(b) ); return rt; } #define MUL64 MUL64 static av_always_inline av_const int64_t MUL64(int a, int b) { int64_t rt; __asm__ ( "imull %2" :"=A"(rt) :"a"(a), "rm"(b) ); return rt; } #endif /* ARCH_X86_32 */ #if HAVE_CMOV /* median of 3 */ #define mid_pred mid_pred static inline av_const int mid_pred(int a, int b, int c) { int i=b; __asm__ volatile( "cmp %2, %1 \n\t" "cmovg %1, %0 \n\t" "cmovg %2, %1 \n\t" "cmp %3, %1 \n\t" "cmovl %3, %1 \n\t" "cmp %1, %0 \n\t" "cmovg %1, %0 \n\t" :"+&r"(i), "+&r"(a) :"r"(b), "r"(c) ); return i; } #endif #if HAVE_CMOV #define COPY3_IF_LT(x, y, a, b, c, d)\ __asm__ volatile(\ "cmpl %0, %3 \n\t"\ "cmovl %3, %0 \n\t"\ "cmovl %4, %1 \n\t"\ "cmovl %5, %2 \n\t"\ : "+&r" (x), "+&r" (a), "+r" (c)\ : "r" (y), "r" (b), "r" (d)\ ); #endif // avoid +32 for shift optimization (gcc should do that ...) #define NEG_SSR32 NEG_SSR32 static inline int32_t NEG_SSR32( int32_t a, int8_t s){ __asm__ ("sarl %1, %0\n\t" : "+r" (a) : "ic" ((uint8_t)(-s)) ); return a; } #define NEG_USR32 NEG_USR32 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){ __asm__ ("shrl %1, %0\n\t" : "+r" (a) : "ic" ((uint8_t)(-s)) ); return a; } #endif /* HAVE_INLINE_ASM */ #endif /* AVCODEC_X86_MATHOPS_H */