158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/*
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* lz4defs.h -- architecture specific defines
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*
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* Copyright (C) 2013, LG Electronics, Kyungsik Lee <kyungsik.lee@lge.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* Detects 64 bits mode
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*/
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#if defined(CONFIG_64BIT)
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#define LZ4_ARCH64 1
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#else
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#define LZ4_ARCH64 0
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#endif
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/*
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* Architecture-specific macros
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*/
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#define BYTE u8
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typedef struct _U16_S { u16 v; } U16_S;
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typedef struct _U32_S { u32 v; } U32_S;
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typedef struct _U64_S { u64 v; } U64_S;
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
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#define A16(x) (((U16_S *)(x))->v)
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#define A32(x) (((U32_S *)(x))->v)
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#define A64(x) (((U64_S *)(x))->v)
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#define PUT4(s, d) (A32(d) = A32(s))
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#define PUT8(s, d) (A64(d) = A64(s))
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#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
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(d = s - A16(p))
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#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
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do { \
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A16(p) = v; \
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p += 2; \
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} while (0)
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#else /* CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS */
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#define A64(x) get_unaligned((u64 *)&(((U16_S *)(x))->v))
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#define A32(x) get_unaligned((u32 *)&(((U16_S *)(x))->v))
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#define A16(x) get_unaligned((u16 *)&(((U16_S *)(x))->v))
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#define PUT4(s, d) \
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put_unaligned(get_unaligned((const u32 *) s), (u32 *) d)
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#define PUT8(s, d) \
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put_unaligned(get_unaligned((const u64 *) s), (u64 *) d)
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#define LZ4_READ_LITTLEENDIAN_16(d, s, p) \
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(d = s - get_unaligned_le16(p))
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#define LZ4_WRITE_LITTLEENDIAN_16(p, v) \
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do { \
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put_unaligned_le16(v, (u16 *)(p)); \
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p += 2; \
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} while (0)
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#endif
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#define COPYLENGTH 8
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#define ML_BITS 4
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#define ML_MASK ((1U << ML_BITS) - 1)
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#define RUN_BITS (8 - ML_BITS)
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#define RUN_MASK ((1U << RUN_BITS) - 1)
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#define MEMORY_USAGE 14
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#define MINMATCH 4
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#define SKIPSTRENGTH 6
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#define LASTLITERALS 5
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#define MFLIMIT (COPYLENGTH + MINMATCH)
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#define MINLENGTH (MFLIMIT + 1)
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#define MAXD_LOG 16
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#define MAXD (1 << MAXD_LOG)
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#define MAXD_MASK (u32)(MAXD - 1)
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#define MAX_DISTANCE (MAXD - 1)
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#define HASH_LOG (MAXD_LOG - 1)
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#define HASHTABLESIZE (1 << HASH_LOG)
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#define MAX_NB_ATTEMPTS 256
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#define OPTIMAL_ML (int)((ML_MASK-1)+MINMATCH)
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#define LZ4_64KLIMIT ((1<<16) + (MFLIMIT - 1))
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#define HASHLOG64K ((MEMORY_USAGE - 2) + 1)
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#define HASH64KTABLESIZE (1U << HASHLOG64K)
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#define LZ4_HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
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((MINMATCH * 8) - (MEMORY_USAGE-2)))
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#define LZ4_HASH64K_VALUE(p) (((A32(p)) * 2654435761U) >> \
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((MINMATCH * 8) - HASHLOG64K))
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#define HASH_VALUE(p) (((A32(p)) * 2654435761U) >> \
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((MINMATCH * 8) - HASH_LOG))
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#if LZ4_ARCH64/* 64-bit */
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#define STEPSIZE 8
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#define LZ4_COPYSTEP(s, d) \
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do { \
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PUT8(s, d); \
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d += 8; \
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s += 8; \
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} while (0)
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#define LZ4_COPYPACKET(s, d) LZ4_COPYSTEP(s, d)
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#define LZ4_SECURECOPY(s, d, e) \
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do { \
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if (d < e) { \
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LZ4_WILDCOPY(s, d, e); \
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} \
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} while (0)
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#define HTYPE u32
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#ifdef __BIG_ENDIAN
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#define LZ4_NBCOMMONBYTES(val) (__builtin_clzll(val) >> 3)
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#else
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#define LZ4_NBCOMMONBYTES(val) (__builtin_ctzll(val) >> 3)
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#endif
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#else /* 32-bit */
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#define STEPSIZE 4
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#define LZ4_COPYSTEP(s, d) \
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do { \
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PUT4(s, d); \
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d += 4; \
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s += 4; \
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} while (0)
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#define LZ4_COPYPACKET(s, d) \
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do { \
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LZ4_COPYSTEP(s, d); \
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LZ4_COPYSTEP(s, d); \
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} while (0)
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#define LZ4_SECURECOPY LZ4_WILDCOPY
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#define HTYPE const u8*
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#ifdef __BIG_ENDIAN
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#define LZ4_NBCOMMONBYTES(val) (__builtin_clz(val) >> 3)
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#else
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#define LZ4_NBCOMMONBYTES(val) (__builtin_ctz(val) >> 3)
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#endif
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#endif
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#define LZ4_WILDCOPY(s, d, e) \
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do { \
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LZ4_COPYPACKET(s, d); \
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} while (d < e)
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#define LZ4_BLINDCOPY(s, d, l) \
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do { \
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u8 *e = (d) + l; \
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LZ4_WILDCOPY(s, d, e); \
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d = e; \
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} while (0)
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