mirror of
https://github.com/torvalds/linux
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8b975bd3f9
This commit updates the kernel LZO code to the current upsteam version which features a significant speed improvement - benchmarking the Calgary and Silesia test corpora typically shows a doubled performance in both compression and decompression on modern i386/x86_64/powerpc machines. Signed-off-by: Markus F.X.J. Oberhumer <markus@oberhumer.com>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* lzodefs.h -- architecture, OS and compiler specific defines
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*
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* Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus@oberhumer.com>
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*
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* The full LZO package can be found at:
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* http://www.oberhumer.com/opensource/lzo/
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*
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* Changed for Linux kernel use by:
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* Nitin Gupta <nitingupta910@gmail.com>
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* Richard Purdie <rpurdie@openedhand.com>
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*/
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#define COPY4(dst, src) \
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put_unaligned(get_unaligned((const u32 *)(src)), (u32 *)(dst))
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#if defined(__x86_64__)
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#define COPY8(dst, src) \
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put_unaligned(get_unaligned((const u64 *)(src)), (u64 *)(dst))
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#else
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#define COPY8(dst, src) \
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COPY4(dst, src); COPY4((dst) + 4, (src) + 4)
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#endif
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#if defined(__BIG_ENDIAN) && defined(__LITTLE_ENDIAN)
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#error "conflicting endian definitions"
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#elif defined(__x86_64__)
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#define LZO_USE_CTZ64 1
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#define LZO_USE_CTZ32 1
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#elif defined(__i386__) || defined(__powerpc__)
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#define LZO_USE_CTZ32 1
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#elif defined(__arm__) && (__LINUX_ARM_ARCH__ >= 5)
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#define LZO_USE_CTZ32 1
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#endif
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#define M1_MAX_OFFSET 0x0400
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#define M2_MAX_OFFSET 0x0800
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#define M3_MAX_OFFSET 0x4000
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#define M4_MAX_OFFSET 0xbfff
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#define M1_MIN_LEN 2
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#define M1_MAX_LEN 2
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#define M2_MIN_LEN 3
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#define M2_MAX_LEN 8
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#define M3_MIN_LEN 3
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#define M3_MAX_LEN 33
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#define M4_MIN_LEN 3
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#define M4_MAX_LEN 9
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#define M1_MARKER 0
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#define M2_MARKER 64
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#define M3_MARKER 32
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#define M4_MARKER 16
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#define lzo_dict_t unsigned short
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#define D_BITS 13
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#define D_SIZE (1u << D_BITS)
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#define D_MASK (D_SIZE - 1)
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#define D_HIGH ((D_MASK >> 1) + 1)
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