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comparison: media/libopus/celt/ecintrin.h
media/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 OPUS_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) && (_MSC_VER >= 1400) | |
| 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 |
