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lz4defs.h
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lz4defs.h
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/*
* lz4defs.h -- architecture specific defines
*
* Copyright (C) 2013, LG Electronics, Kyungsik Lee <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* Detects 64 bits mode
*/
#if (defined(__x86_64__) || defined(__x86_64) || defined(__amd64__) \
|| defined(__ppc64__) || defined(__LP64__))
#define LZ4_ARCH64 1
#else
#define LZ4_ARCH64 0
#endif
/*
* Architecture-specific macros
*/
#define BYTE u8
typedef struct _U16_S { u16 v; } U16_S;
typedef struct _U32_S { u32 v; } U32_S;
typedef struct _U64_S { u64 v; } U64_S;
#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) \
|| defined(CONFIG_ARM) && __LINUX_ARM_ARCH__ >= 6 \
&& defined(ARM_EFFICIENT_UNALIGNED_ACCESS)
#define A16(x) (((U16_S *)(x))->v)
#define A32(x) (((U32_S *)(x))->v)
#define A64(x) (((U64_S *)(x))->v)
#define PUT4(s, d) (A32(d) = A32(s))
#define PUT8(s, d) (A64(d) = A64(s))
#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
do { \
A16(p) = v; \
p += 2; \
} while (0)
#else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
#define A64(x) get_unaligned((u64 *)&(((U16_S *)(x))->v))
#define A32(x) get_unaligned((u32 *)&(((U16_S *)(x))->v))
#define A16(x) get_unaligned((u16 *)&(((U16_S *)(x))->v))
#define PUT4(s, d) \
put_unaligned(get_unaligned((const u32 *) s), (u32 *) d)
#define PUT8(s, d) \
put_unaligned(get_unaligned((const u64 *) s), (u64 *) d)
#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
do { \
put_unaligned(v, (u16 *)(p)); \
p += 2; \
} while (0)
#endif
#define COPYLENGTH 8
#define ML_BITS 4
#define ML_MASK ((1U << ML_BITS) - 1)
#define RUN_BITS (8 - ML_BITS)
#define RUN_MASK ((1U << RUN_BITS) - 1)
#define MEMORY_USAGE 14
#define MINMATCH 4
#define SKIPSTRENGTH 6
#define LASTLITERALS 5
#define MFLIMIT (COPYLENGTH + MINMATCH)
#define MINLENGTH (MFLIMIT + 1)
#define MAXD_LOG 16
#define MAXD (1 << MAXD_LOG)
#define MAXD_MASK (u32)(MAXD - 1)
#define MAX_DISTANCE (MAXD - 1)
#define HASH_LOG (MAXD_LOG - 1)
#define HASHTABLESIZE (1 << HASH_LOG)
#define MAX_NB_ATTEMPTS 256
#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
#define LZ4_64KLIMIT ((1<<16) + (MFLIMIT - 1))
#define HASHLOG64K ((MEMORY_USAGE - 2) + 1)
#define HASH64KTABLESIZE (1U << HASHLOG64K)
#define LZ4_HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
((MINMATCH * 8) - (MEMORY_USAGE-2)))
#define LZ4_HASH64K_VALUE(p) (((A32(p)) * 2654435761U) >> \
((MINMATCH * 8) - HASHLOG64K))
#define HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
((MINMATCH * 8) - HASH_LOG))
#if LZ4_ARCH64/* 64-bit */
#define STEPSIZE 8
#define LZ4_COPYSTEP(s, d) \
do { \
PUT8(s, d); \
d += 8; \
s += 8; \
} while (0)
#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d)
#define LZ4_SECURECOPY(s, d, e) \
do { \
if (d < e) { \
LZ4_WILDCOPY(s, d, e); \
} \
} while (0)
#define HTYPE u32
#ifdef __BIG_ENDIAN
#define LZ4_NBCOMMONBYTES(val) (__builtin_clzll(val) >> 3)
#else
#define LZ4_NBCOMMONBYTES(val) (__builtin_ctzll(val) >> 3)
#endif
#else /* 32-bit */
#define STEPSIZE 4
#define LZ4_COPYSTEP(s, d) \
do { \
PUT4(s, d); \
d += 4; \
s += 4; \
} while (0)
#define LZ4_COPYPACKET(s, d) \
do { \
LZ4_COPYSTEP(s, d); \
LZ4_COPYSTEP(s, d); \
} while (0)
#define LZ4_SECURECOPY LZ4_WILDCOPY
#define HTYPE const u8*
#ifdef __BIG_ENDIAN
#define LZ4_NBCOMMONBYTES(val) (__builtin_clz(val) >> 3)
#else
#define LZ4_NBCOMMONBYTES(val) (__builtin_ctz(val) >> 3)
#endif
#endif
#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
(d = s - get_unaligned_le16(p))
#define LZ4_WILDCOPY(s, d, e) \
do { \
LZ4_COPYPACKET(s, d); \
} while (d < e)
#define LZ4_BLINDCOPY(s, d, l) \
do { \
u8 *e = (d) + l; \
LZ4_WILDCOPY(s, d, e); \
d = e; \
} while (0)