1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libopus/celt/ecintrin.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,87 @@
1.4 +/* Copyright (c) 2003-2008 Timothy B. Terriberry
1.5 + Copyright (c) 2008 Xiph.Org Foundation */
1.6 +/*
1.7 + Redistribution and use in source and binary forms, with or without
1.8 + modification, are permitted provided that the following conditions
1.9 + are met:
1.10 +
1.11 + - Redistributions of source code must retain the above copyright
1.12 + notice, this list of conditions and the following disclaimer.
1.13 +
1.14 + - Redistributions in binary form must reproduce the above copyright
1.15 + notice, this list of conditions and the following disclaimer in the
1.16 + documentation and/or other materials provided with the distribution.
1.17 +
1.18 + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
1.19 + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
1.20 + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
1.21 + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
1.22 + OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
1.23 + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
1.24 + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
1.25 + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
1.26 + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
1.27 + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
1.28 + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.29 +*/
1.30 +
1.31 +/*Some common macros for potential platform-specific optimization.*/
1.32 +#include "opus_types.h"
1.33 +#include <math.h>
1.34 +#include <limits.h>
1.35 +#include "arch.h"
1.36 +#if !defined(_ecintrin_H)
1.37 +# define _ecintrin_H (1)
1.38 +
1.39 +/*Some specific platforms may have optimized intrinsic or OPUS_INLINE assembly
1.40 + versions of these functions which can substantially improve performance.
1.41 + We define macros for them to allow easy incorporation of these non-ANSI
1.42 + features.*/
1.43 +
1.44 +/*Modern gcc (4.x) can compile the naive versions of min and max with cmov if
1.45 + given an appropriate architecture, but the branchless bit-twiddling versions
1.46 + are just as fast, and do not require any special target architecture.
1.47 + Earlier gcc versions (3.x) compiled both code to the same assembly
1.48 + instructions, because of the way they represented ((_b)>(_a)) internally.*/
1.49 +# define EC_MINI(_a,_b) ((_a)+(((_b)-(_a))&-((_b)<(_a))))
1.50 +
1.51 +/*Count leading zeros.
1.52 + This macro should only be used for implementing ec_ilog(), if it is defined.
1.53 + All other code should use EC_ILOG() instead.*/
1.54 +#if defined(_MSC_VER) && (_MSC_VER >= 1400)
1.55 +# include <intrin.h>
1.56 +/*In _DEBUG mode this is not an intrinsic by default.*/
1.57 +# pragma intrinsic(_BitScanReverse)
1.58 +
1.59 +static __inline int ec_bsr(unsigned long _x){
1.60 + unsigned long ret;
1.61 + _BitScanReverse(&ret,_x);
1.62 + return (int)ret;
1.63 +}
1.64 +# define EC_CLZ0 (1)
1.65 +# define EC_CLZ(_x) (-ec_bsr(_x))
1.66 +#elif defined(ENABLE_TI_DSPLIB)
1.67 +# include "dsplib.h"
1.68 +# define EC_CLZ0 (31)
1.69 +# define EC_CLZ(_x) (_lnorm(_x))
1.70 +#elif __GNUC_PREREQ(3,4)
1.71 +# if INT_MAX>=2147483647
1.72 +# define EC_CLZ0 ((int)sizeof(unsigned)*CHAR_BIT)
1.73 +# define EC_CLZ(_x) (__builtin_clz(_x))
1.74 +# elif LONG_MAX>=2147483647L
1.75 +# define EC_CLZ0 ((int)sizeof(unsigned long)*CHAR_BIT)
1.76 +# define EC_CLZ(_x) (__builtin_clzl(_x))
1.77 +# endif
1.78 +#endif
1.79 +
1.80 +#if defined(EC_CLZ)
1.81 +/*Note that __builtin_clz is not defined when _x==0, according to the gcc
1.82 + documentation (and that of the BSR instruction that implements it on x86).
1.83 + The majority of the time we can never pass it zero.
1.84 + When we need to, it can be special cased.*/
1.85 +# define EC_ILOG(_x) (EC_CLZ0-EC_CLZ(_x))
1.86 +#else
1.87 +int ec_ilog(opus_uint32 _v);
1.88 +# define EC_ILOG(_x) (ec_ilog(_x))
1.89 +#endif
1.90 +#endif
