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