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Diffstat (limited to 'lib/rbcodec/codecs/libopus/celt/ecintrin.h')
-rw-r--r-- | lib/rbcodec/codecs/libopus/celt/ecintrin.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libopus/celt/ecintrin.h b/lib/rbcodec/codecs/libopus/celt/ecintrin.h new file mode 100644 index 0000000000..3dffa5f95c --- /dev/null +++ b/lib/rbcodec/codecs/libopus/celt/ecintrin.h | |||
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1 | /* Copyright (c) 2003-2008 Timothy B. Terriberry | ||
2 | Copyright (c) 2008 Xiph.Org Foundation */ | ||
3 | /* | ||
4 | Redistribution and use in source and binary forms, with or without | ||
5 | modification, are permitted provided that the following conditions | ||
6 | are met: | ||
7 | |||
8 | - Redistributions of source code must retain the above copyright | ||
9 | notice, this list of conditions and the following disclaimer. | ||
10 | |||
11 | - Redistributions in binary form must reproduce the above copyright | ||
12 | notice, this list of conditions and the following disclaimer in the | ||
13 | documentation and/or other materials provided with the distribution. | ||
14 | |||
15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
16 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
17 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
18 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER | ||
19 | OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | ||
20 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | ||
22 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | ||
23 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | ||
24 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
25 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
26 | */ | ||
27 | |||
28 | /*Some common macros for potential platform-specific optimization.*/ | ||
29 | #include "opus_types.h" | ||
30 | #include <math.h> | ||
31 | #include <limits.h> | ||
32 | #include "arch.h" | ||
33 | #if !defined(_ecintrin_H) | ||
34 | # define _ecintrin_H (1) | ||
35 | |||
36 | /*Some specific platforms may have optimized intrinsic or inline assembly | ||
37 | versions of these functions which can substantially improve performance. | ||
38 | We define macros for them to allow easy incorporation of these non-ANSI | ||
39 | features.*/ | ||
40 | |||
41 | /*Modern gcc (4.x) can compile the naive versions of min and max with cmov if | ||
42 | given an appropriate architecture, but the branchless bit-twiddling versions | ||
43 | are just as fast, and do not require any special target architecture. | ||
44 | Earlier gcc versions (3.x) compiled both code to the same assembly | ||
45 | instructions, because of the way they represented ((_b)>(_a)) internally.*/ | ||
46 | # define EC_MINI(_a,_b) ((_a)+(((_b)-(_a))&-((_b)<(_a)))) | ||
47 | |||
48 | /*Count leading zeros. | ||
49 | This macro should only be used for implementing ec_ilog(), if it is defined. | ||
50 | All other code should use EC_ILOG() instead.*/ | ||
51 | #if defined(_MSC_VER) | ||
52 | # include <intrin.h> | ||
53 | /*In _DEBUG mode this is not an intrinsic by default.*/ | ||
54 | # pragma intrinsic(_BitScanReverse) | ||
55 | |||
56 | static __inline int ec_bsr(unsigned long _x){ | ||
57 | unsigned long ret; | ||
58 | _BitScanReverse(&ret,_x); | ||
59 | return (int)ret; | ||
60 | } | ||
61 | # define EC_CLZ0 (1) | ||
62 | # define EC_CLZ(_x) (-ec_bsr(_x)) | ||
63 | #elif defined(ENABLE_TI_DSPLIB) | ||
64 | # include "dsplib.h" | ||
65 | # define EC_CLZ0 (31) | ||
66 | # define EC_CLZ(_x) (_lnorm(_x)) | ||
67 | #elif __GNUC_PREREQ(3,4) | ||
68 | # if INT_MAX>=2147483647 | ||
69 | # define EC_CLZ0 ((int)sizeof(unsigned)*CHAR_BIT) | ||
70 | # define EC_CLZ(_x) (__builtin_clz(_x)) | ||
71 | # elif LONG_MAX>=2147483647L | ||
72 | # define EC_CLZ0 ((int)sizeof(unsigned long)*CHAR_BIT) | ||
73 | # define EC_CLZ(_x) (__builtin_clzl(_x)) | ||
74 | # endif | ||
75 | #endif | ||
76 | |||
77 | #if defined(EC_CLZ) | ||
78 | /*Note that __builtin_clz is not defined when _x==0, according to the gcc | ||
79 | documentation (and that of the BSR instruction that implements it on x86). | ||
80 | The majority of the time we can never pass it zero. | ||
81 | When we need to, it can be special cased.*/ | ||
82 | # define EC_ILOG(_x) (EC_CLZ0-EC_CLZ(_x)) | ||
83 | #else | ||
84 | int ec_ilog(opus_uint32 _v); | ||
85 | # define EC_ILOG(_x) (ec_ilog(_x)) | ||
86 | #endif | ||
87 | #endif | ||