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91 lines
3.6 KiB
91 lines
3.6 KiB
/* Copyright (c) 2003-2008 Timothy B. Terriberry |
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Copyright (c) 2008 Xiph.Org Foundation */ |
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/* |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions |
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are met: |
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- Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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- Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER |
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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/*Some common macros for potential platform-specific optimization.*/ |
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#include "opus_types.h" |
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#include <math.h> |
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#include <limits.h> |
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#include "arch.h" |
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#if !defined(_ecintrin_H) |
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# define _ecintrin_H (1) |
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/*Some specific platforms may have optimized intrinsic or OPUS_INLINE assembly |
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versions of these functions which can substantially improve performance. |
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We define macros for them to allow easy incorporation of these non-ANSI |
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features.*/ |
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/*Modern gcc (4.x) can compile the naive versions of min and max with cmov if |
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given an appropriate architecture, but the branchless bit-twiddling versions |
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are just as fast, and do not require any special target architecture. |
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Earlier gcc versions (3.x) compiled both code to the same assembly |
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instructions, because of the way they represented ((_b)>(_a)) internally.*/ |
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# define EC_MINI(_a,_b) ((_a)+(((_b)-(_a))&-((_b)<(_a)))) |
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/*Count leading zeros. |
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This macro should only be used for implementing ec_ilog(), if it is defined. |
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All other code should use EC_ILOG() instead.*/ |
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#if defined(_MSC_VER) && (_MSC_VER >= 1400) |
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#if defined(_MSC_VER) && (_MSC_VER >= 1910) |
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# include <intrin0.h> /* Improve compiler throughput. */ |
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#else |
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# include <intrin.h> |
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#endif |
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/*In _DEBUG mode this is not an intrinsic by default.*/ |
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# pragma intrinsic(_BitScanReverse) |
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static __inline int ec_bsr(unsigned long _x){ |
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unsigned long ret; |
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_BitScanReverse(&ret,_x); |
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return (int)ret; |
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} |
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# define EC_CLZ0 (1) |
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# define EC_CLZ(_x) (-ec_bsr(_x)) |
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#elif defined(ENABLE_TI_DSPLIB) |
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# include "dsplib.h" |
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# define EC_CLZ0 (31) |
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# define EC_CLZ(_x) (_lnorm(_x)) |
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#elif __GNUC_PREREQ(3,4) |
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# if INT_MAX>=2147483647 |
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# define EC_CLZ0 ((int)sizeof(unsigned)*CHAR_BIT) |
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# define EC_CLZ(_x) (__builtin_clz(_x)) |
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# elif LONG_MAX>=2147483647L |
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# define EC_CLZ0 ((int)sizeof(unsigned long)*CHAR_BIT) |
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# define EC_CLZ(_x) (__builtin_clzl(_x)) |
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# endif |
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#endif |
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#if defined(EC_CLZ) |
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/*Note that __builtin_clz is not defined when _x==0, according to the gcc |
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documentation (and that of the BSR instruction that implements it on x86). |
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The majority of the time we can never pass it zero. |
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When we need to, it can be special cased.*/ |
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# define EC_ILOG(_x) (EC_CLZ0-EC_CLZ(_x)) |
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#else |
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int ec_ilog(opus_uint32 _v); |
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# define EC_ILOG(_x) (ec_ilog(_x)) |
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#endif |
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#endif
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