| /* |
| * simple math operations |
| * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al |
| * |
| * 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_X86_MATHOPS_H |
| #define AVCODEC_X86_MATHOPS_H |
| |
| #include "config.h" |
| |
| #include "libavutil/common.h" |
| #include "libavutil/x86/asm.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_I686 |
| /* 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__ ( |
| "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; |
| } |
| |
| #if HAVE_6REGS |
| #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 /* HAVE_6REGS */ |
| |
| #endif /* HAVE_I686 */ |
| |
| #define MASK_ABS(mask, level) \ |
| __asm__ ("cdq \n\t" \ |
| "xorl %1, %0 \n\t" \ |
| "subl %1, %0 \n\t" \ |
| : "+a"(level), "=&d"(mask)) |
| |
| // 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 */ |