1 /*

2 * simple math operations

3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al

4 *

5 * This file is part of FFmpeg.

6 *

7 * FFmpeg is free software; you can redistribute it and/or

8 * modify it under the terms of the GNU Lesser General Public

9 * License as published by the Free Software Foundation; either

10 * version 2.1 of the License, or (at your option) any later version.

11 *

12 * FFmpeg is distributed in the hope that it will be useful,

13 * but WITHOUT ANY WARRANTY; without even the implied warranty of

14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

15 * Lesser General Public License for more details.

16 *

17 * You should have received a copy of the GNU Lesser General Public

18 * License along with FFmpeg; if not, write to the Free Software

19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

20 */

21

22 #ifndef AVCODEC_X86_MATHOPS_H

23 #define AVCODEC_X86_MATHOPS_H

24

25 #include "config.h"

26 #include "libavutil/common.h"

27

28 #if ARCH_X86_32

29 #define MULL(ra, rb, shift) \

30 ({ int rt, dummy; __asm__ (\

31 "imull %3 \n\t"\

32 "shrdl %4, %%edx, %%eax \n\t"\

33 : "=a"(rt), "=d"(dummy)\

34 : "a" ((int)ra), "rm" ((int)rb), "i"(shift));\

35 rt; })

36

37 #define MULH(ra, rb) \

38 ({ int rt, dummy;\

39 __asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\

40 rt; })

41

42 #define MUL64(ra, rb) \

43 ({ int64_t rt;\

44 __asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\

45 rt; })

46 #endif

47

48 // avoid +32 for shift optimization (gcc should do that ...)

49 #define NEG_SSR32 NEG_SSR32

50 static inline int32_t NEG_SSR32( int32_t a, int8_t s){

51 __asm__ ("sarl %1, %0\n\t"

52 : "+r" (a)

53 : "ic" ((uint8_t)(-s))

54 );

55 return a;

56 }

57

58 #define NEG_USR32 NEG_USR32

59 static inline uint32_t NEG_USR32(uint32_t a, int8_t s){

60 __asm__ ("shrl %1, %0\n\t"

61 : "+r" (a)

62 : "ic" ((uint8_t)(-s))

63 );

64 return a;

65 }

66

67 #endif /* AVCODEC_X86_MATHOPS_H */