FFmpeg
mathops.h
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1 /*
2  * simple math operations
3  * Copyright (c) 2001, 2002 Fabrice Bellard
4  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #ifndef AVCODEC_PPC_MATHOPS_H
24 #define AVCODEC_PPC_MATHOPS_H
25 
26 #include <stdint.h>
27 #include "config.h"
28 #include "libavutil/common.h"
29 
30 #if HAVE_PPC4XX
31 /* signed 16x16 -> 32 multiply add accumulate */
32 #define MAC16(rt, ra, rb) \
33  __asm__ ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
34 
35 /* signed 16x16 -> 32 multiply */
36 #define MUL16(ra, rb) \
37  ({ int __rt; \
38  __asm__ ("mullhw %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); \
39  __rt; })
40 #endif
41 
42 #define MULH MULH
43 static inline av_const int MULH(int a, int b){
44  int r;
45  __asm__ ("mulhw %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
46  return r;
47 }
48 
49 #if !ARCH_PPC64
50 static inline av_const int64_t MAC64(int64_t d, int a, int b)
51 {
52  union { uint64_t x; unsigned hl[2]; } x = { d };
53  int h, l;
54  __asm__ ("mullw %3, %4, %5 \n\t"
55  "mulhw %2, %4, %5 \n\t"
56  "addc %1, %1, %3 \n\t"
57  "adde %0, %0, %2 \n\t"
58  : "+r"(x.hl[0]), "+r"(x.hl[1]), "=&r"(h), "=&r"(l)
59  : "r"(a), "r"(b));
60  return x.x;
61 }
62 #define MAC64(d, a, b) ((d) = MAC64(d, a, b))
63 
64 static inline av_const int64_t MLS64(int64_t d, int a, int b)
65 {
66  union { uint64_t x; unsigned hl[2]; } x = { d };
67  int h, l;
68  __asm__ ("mullw %3, %4, %5 \n\t"
69  "mulhw %2, %4, %5 \n\t"
70  "subfc %1, %3, %1 \n\t"
71  "subfe %0, %2, %0 \n\t"
72  : "+r"(x.hl[0]), "+r"(x.hl[1]), "=&r"(h), "=&r"(l)
73  : "r"(a), "r"(b));
74  return x.x;
75 }
76 #define MLS64(d, a, b) ((d) = MLS64(d, a, b))
77 #endif
78 
79 #endif /* AVCODEC_PPC_MATHOPS_H */
#define av_const
Definition: attributes.h:76
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
const char * r
Definition: vf_curves.c:114
#define b
Definition: input.c:41
#define MAC64(d, a, b)
Definition: mathops.h:62
common internal and external API header
#define MLS64(d, a, b)
Definition: mathops.h:76
#define MULH
Definition: mathops.h:42