[pcsx_rearmed.git] / deps / flac-1.3.2 / src / libFLAC / include / private / bitmath.h

/* libFLAC - Free Lossless Audio Codec library
 * Copyright (C) 2001-2009  Josh Coalson
 * Copyright (C) 2011-2016  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.
 *
 * - Neither the name of the Xiph.org Foundation nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * 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 FOUNDATION 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.
 */

#ifndef FLAC__PRIVATE__BITMATH_H
#define FLAC__PRIVATE__BITMATH_H

#include "FLAC/ordinals.h"
#include "FLAC/assert.h"

#include "share/compat.h"

#if defined(_MSC_VER)
#include <intrin.h> /* for _BitScanReverse* */
#endif

/* Will never be emitted for MSVC, GCC, Intel compilers */
static inline unsigned int FLAC__clz_soft_uint32(FLAC__uint32 word)
{
	static const unsigned char byte_to_unary_table[] = {
	8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	};

	return word > 0xffffff ? byte_to_unary_table[word >> 24] :
		word > 0xffff ? byte_to_unary_table[word >> 16] + 8 :
		word > 0xff ? byte_to_unary_table[word >> 8] + 16 :
		byte_to_unary_table[word] + 24;
}

static inline unsigned int FLAC__clz_uint32(FLAC__uint32 v)
{
/* Never used with input 0 */
	FLAC__ASSERT(v > 0);
#if defined(__INTEL_COMPILER)
	return _bit_scan_reverse(v) ^ 31U;
#elif defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
/* This will translate either to (bsr ^ 31U), clz , ctlz, cntlz, lzcnt depending on
 * -march= setting or to a software routine in exotic machines. */
	return __builtin_clz(v);
#elif defined(_MSC_VER)
	{
		unsigned long idx;
		_BitScanReverse(&idx, v);
		return idx ^ 31U;
	}
#else
	return FLAC__clz_soft_uint32(v);
#endif
}

/* Used when 64-bit bsr/clz is unavailable; can use 32-bit bsr/clz when possible */
static inline unsigned int FLAC__clz_soft_uint64(FLAC__uint64 word)
{
	return (FLAC__uint32)(word>>32) ? FLAC__clz_uint32((FLAC__uint32)(word>>32)) :
		FLAC__clz_uint32((FLAC__uint32)word) + 32;
}

static inline unsigned int FLAC__clz_uint64(FLAC__uint64 v)
{
	/* Never used with input 0 */
	FLAC__ASSERT(v > 0);
#if defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
	return __builtin_clzll(v);
#elif (defined(__INTEL_COMPILER) || defined(_MSC_VER)) && (defined(_M_IA64) || defined(_M_X64))
	{
		unsigned long idx;
		_BitScanReverse64(&idx, v);
		return idx ^ 63U;
	}
#else
	return FLAC__clz_soft_uint64(v);
#endif
}

/* These two functions work with input 0 */
static inline unsigned int FLAC__clz2_uint32(FLAC__uint32 v)
{
	if (!v)
		return 32;
	return FLAC__clz_uint32(v);
}

static inline unsigned int FLAC__clz2_uint64(FLAC__uint64 v)
{
	if (!v)
		return 64;
	return FLAC__clz_uint64(v);
}

/* An example of what FLAC__bitmath_ilog2() computes:
 *
 * ilog2( 0) = assertion failure
 * ilog2( 1) = 0
 * ilog2( 2) = 1
 * ilog2( 3) = 1
 * ilog2( 4) = 2
 * ilog2( 5) = 2
 * ilog2( 6) = 2
 * ilog2( 7) = 2
 * ilog2( 8) = 3
 * ilog2( 9) = 3
 * ilog2(10) = 3
 * ilog2(11) = 3
 * ilog2(12) = 3
 * ilog2(13) = 3
 * ilog2(14) = 3
 * ilog2(15) = 3
 * ilog2(16) = 4
 * ilog2(17) = 4
 * ilog2(18) = 4
 */

static inline unsigned FLAC__bitmath_ilog2(FLAC__uint32 v)
{
	FLAC__ASSERT(v > 0);
#if defined(__INTEL_COMPILER)
	return _bit_scan_reverse(v);
#elif defined(_MSC_VER)
	{
		unsigned long idx;
		_BitScanReverse(&idx, v);
		return idx;
	}
#else
	return FLAC__clz_uint32(v) ^ 31U;
#endif
}

static inline unsigned FLAC__bitmath_ilog2_wide(FLAC__uint64 v)
{
	FLAC__ASSERT(v > 0);
#if defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
	return __builtin_clzll(v) ^ 63U;
/* Sorry, only supported in x64/Itanium.. and both have fast FPU which makes integer-only encoder pointless */
#elif (defined(__INTEL_COMPILER) || defined(_MSC_VER)) && (defined(_M_IA64) || defined(_M_X64))
	{
		unsigned long idx;
		_BitScanReverse64(&idx, v);
		return idx;
	}
#else
/*  Brain-damaged compilers will use the fastest possible way that is,
	de Bruijn sequences (http://supertech.csail.mit.edu/papers/debruijn.pdf)
	(C) Timothy B. Terriberry (tterribe@xiph.org) 2001-2009 CC0 (Public domain).
*/
	{
		static const unsigned char DEBRUIJN_IDX64[64]={
			0, 1, 2, 7, 3,13, 8,19, 4,25,14,28, 9,34,20,40,
			5,17,26,38,15,46,29,48,10,31,35,54,21,50,41,57,
			63, 6,12,18,24,27,33,39,16,37,45,47,30,53,49,56,
			62,11,23,32,36,44,52,55,61,22,43,51,60,42,59,58
		};
		v|= v>>1;
		v|= v>>2;
		v|= v>>4;
		v|= v>>8;
		v|= v>>16;
		v|= v>>32;
		v= (v>>1)+1;
		return DEBRUIJN_IDX64[v*FLAC__U64L(0x218A392CD3D5DBF)>>58&0x3F];
	}
#endif
}

unsigned FLAC__bitmath_silog2(FLAC__int64 v);

#endif
Commit	Line	Data
ce188d4d	1	/* libFLAC - Free Lossless Audio Codec library
	2	* Copyright (C) 2001-2009 Josh Coalson
	3	* Copyright (C) 2011-2016 Xiph.Org Foundation
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	*
	9	* - Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	*
	12	* - Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	*
	16	* - Neither the name of the Xiph.org Foundation nor the names of its
	17	* contributors may be used to endorse or promote products derived from
	18	* this software without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	21	* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	22	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	23	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
	24	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	25	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	26	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	27	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	28	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	29	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	30	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	31	*/
	32
	33	#ifndef FLAC__PRIVATE__BITMATH_H
	34	#define FLAC__PRIVATE__BITMATH_H
	35
	36	#include "FLAC/ordinals.h"
	37	#include "FLAC/assert.h"
	38
	39	#include "share/compat.h"
	40
	41	#if defined(_MSC_VER)
	42	#include <intrin.h> /* for _BitScanReverse* */
	43	#endif
	44
	45	/* Will never be emitted for MSVC, GCC, Intel compilers */
	46	static inline unsigned int FLAC__clz_soft_uint32(FLAC__uint32 word)
	47	{
	48	static const unsigned char byte_to_unary_table[] = {
	49	8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
	50	3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
	51	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
	52	2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
	53	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	54	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	55	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	56	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
	57	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	58	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	59	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	60	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	61	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	62	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	63	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	64	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
65	};
66
67	return word > 0xffffff ? byte_to_unary_table[word >> 24] :
68	word > 0xffff ? byte_to_unary_table[word >> 16] + 8 :
69	word > 0xff ? byte_to_unary_table[word >> 8] + 16 :
70	byte_to_unary_table[word] + 24;
71	}
72
73	static inline unsigned int FLAC__clz_uint32(FLAC__uint32 v)
74	{
75	/* Never used with input 0 */
76	FLAC__ASSERT(v > 0);
77	#if defined(__INTEL_COMPILER)
78	return _bit_scan_reverse(v) ^ 31U;
79	#elif defined(__GNUC__) && (__GNUC__ >= 4 \|\| (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
80	/* This will translate either to (bsr ^ 31U), clz , ctlz, cntlz, lzcnt depending on
81	* -march= setting or to a software routine in exotic machines. */
82	return __builtin_clz(v);
83	#elif defined(_MSC_VER)
84	{
85	unsigned long idx;
86	_BitScanReverse(&idx, v);
87	return idx ^ 31U;
88	}
89	#else
90	return FLAC__clz_soft_uint32(v);
91	#endif
92	}
93
94	/* Used when 64-bit bsr/clz is unavailable; can use 32-bit bsr/clz when possible */
95	static inline unsigned int FLAC__clz_soft_uint64(FLAC__uint64 word)
96	{
97	return (FLAC__uint32)(word>>32) ? FLAC__clz_uint32((FLAC__uint32)(word>>32)) :
98	FLAC__clz_uint32((FLAC__uint32)word) + 32;
99	}
100
101	static inline unsigned int FLAC__clz_uint64(FLAC__uint64 v)
102	{
103	/* Never used with input 0 */
104	FLAC__ASSERT(v > 0);
105	#if defined(__GNUC__) && (__GNUC__ >= 4 \|\| (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
106	return __builtin_clzll(v);
107	#elif (defined(__INTEL_COMPILER) \|\| defined(_MSC_VER)) && (defined(_M_IA64) \|\| defined(_M_X64))
108	{
109	unsigned long idx;
110	_BitScanReverse64(&idx, v);
111	return idx ^ 63U;
112	}
113	#else
114	return FLAC__clz_soft_uint64(v);
115	#endif
116	}
117
118	/* These two functions work with input 0 */
119	static inline unsigned int FLAC__clz2_uint32(FLAC__uint32 v)
120	{
121	if (!v)
122	return 32;
123	return FLAC__clz_uint32(v);
124	}
125
126	static inline unsigned int FLAC__clz2_uint64(FLAC__uint64 v)
127	{
128	if (!v)
129	return 64;
130	return FLAC__clz_uint64(v);
131	}
132
133	/* An example of what FLAC__bitmath_ilog2() computes:
134	*
135	* ilog2( 0) = assertion failure
136	* ilog2( 1) = 0
137	* ilog2( 2) = 1
138	* ilog2( 3) = 1
139	* ilog2( 4) = 2
140	* ilog2( 5) = 2
141	* ilog2( 6) = 2
142	* ilog2( 7) = 2
143	* ilog2( 8) = 3
144	* ilog2( 9) = 3
145	* ilog2(10) = 3
146	* ilog2(11) = 3
147	* ilog2(12) = 3
148	* ilog2(13) = 3
149	* ilog2(14) = 3
150	* ilog2(15) = 3
151	* ilog2(16) = 4
152	* ilog2(17) = 4
153	* ilog2(18) = 4
154	*/
155
156	static inline unsigned FLAC__bitmath_ilog2(FLAC__uint32 v)
157	{
158	FLAC__ASSERT(v > 0);
159	#if defined(__INTEL_COMPILER)
160	return _bit_scan_reverse(v);
161	#elif defined(_MSC_VER)
162	{
163	unsigned long idx;
164	_BitScanReverse(&idx, v);
165	return idx;
166	}
167	#else
168	return FLAC__clz_uint32(v) ^ 31U;
169	#endif
170	}
171
172	static inline unsigned FLAC__bitmath_ilog2_wide(FLAC__uint64 v)
173	{
174	FLAC__ASSERT(v > 0);
175	#if defined(__GNUC__) && (__GNUC__ >= 4 \|\| (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
176	return __builtin_clzll(v) ^ 63U;
177	/* Sorry, only supported in x64/Itanium.. and both have fast FPU which makes integer-only encoder pointless */
178	#elif (defined(__INTEL_COMPILER) \|\| defined(_MSC_VER)) && (defined(_M_IA64) \|\| defined(_M_X64))
179	{
180	unsigned long idx;
181	_BitScanReverse64(&idx, v);
182	return idx;
183	}
184	#else
185	/* Brain-damaged compilers will use the fastest possible way that is,
186	de Bruijn sequences (http://supertech.csail.mit.edu/papers/debruijn.pdf)
187	(C) Timothy B. Terriberry (tterribe@xiph.org) 2001-2009 CC0 (Public domain).
188	*/
189	{
190	static const unsigned char DEBRUIJN_IDX64[64]={
191	0, 1, 2, 7, 3,13, 8,19, 4,25,14,28, 9,34,20,40,
192	5,17,26,38,15,46,29,48,10,31,35,54,21,50,41,57,
193	63, 6,12,18,24,27,33,39,16,37,45,47,30,53,49,56,
194	62,11,23,32,36,44,52,55,61,22,43,51,60,42,59,58
195	};
196	v\|= v>>1;
197	v\|= v>>2;
198	v\|= v>>4;
199	v\|= v>>8;
200	v\|= v>>16;
201	v\|= v>>32;
202	v= (v>>1)+1;
203	return DEBRUIJN_IDX64[v*FLAC__U64L(0x218A392CD3D5DBF)>>58&0x3F];
204	}
205	#endif
206	}
207
208	unsigned FLAC__bitmath_silog2(FLAC__int64 v);
209
210	#endif