2 * simple math operations
3 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVCODEC_ARM_MATHOPS_H
23 #define AVCODEC_ARM_MATHOPS_H
27 #include "libavutil/common.h"
33 static inline av_const
int MULH(int a
, int b
)
36 __asm__ ("smmul %0, %1, %2" : "=r"(r
) : "r"(a
), "r"(b
));
40 #define FASTDIV FASTDIV
41 static av_always_inline av_const
int FASTDIV(int a
, int b
)
44 __asm__ ("cmp %2, #2 \n\t"
45 "ldr %0, [%3, %2, lsl #2] \n\t"
47 "lsrle %0, %1, #1 \n\t"
48 "smmulgt %0, %0, %1 \n\t"
49 : "=&r"(r
) : "r"(a
), "r"(b
), "r"(ff_inverse
) : "cc");
53 #else /* HAVE_ARMV6_INLINE */
55 #define FASTDIV FASTDIV
56 static av_always_inline av_const
int FASTDIV(int a
, int b
)
59 __asm__ ("umull %1, %0, %2, %3"
60 : "=&r"(r
), "=&r"(t
) : "r"(a
), "r"(ff_inverse
[b
]));
65 #define MLS64(d, a, b) MAC64(d, -(a), b)
67 #if HAVE_ARMV5TE_INLINE
69 /* signed 16x16 -> 32 multiply add accumulate */
70 # define MAC16(rt, ra, rb) \
71 __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
73 /* signed 16x16 -> 32 multiply */
75 static inline av_const
int MUL16(int ra
, int rb
)
78 __asm__ ("smulbb %0, %1, %2" : "=r"(rt
) : "r"(ra
), "r"(rb
));
84 #define mid_pred mid_pred
85 static inline av_const
int mid_pred(int a
, int b
, int c
)
106 #endif /* HAVE_INLINE_ASM */
108 #endif /* AVCODEC_ARM_MATHOPS_H */