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liblzma: Refactor crc_common.h.
The CRC_GENERIC is now split into CRC32_GENERIC and CRC64_GENERIC, since the ARM64 optimizations will be different between CRC32 and CRC64. For the same reason, CRC_ARCH_OPTIMIZED is split into CRC32_ARCH_OPTIMIZED and CRC64_ARCH_OPTIMIZED. ifunc will only be used with x86-64 CLMUL because the runtime detection methods needed with ARM64 are not compatible with ifunc.
This commit is contained in:
Jia Tan
parent
61908e8160
commit
455a08609c
3 changed files with 81 additions and 41 deletions
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@ -24,7 +24,7 @@
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#endif
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#ifdef CRC_GENERIC
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#ifdef CRC32_GENERIC
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///////////////////
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// Generic CRC32 //
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@ -90,7 +90,7 @@ crc32_generic(const uint8_t *buf, size_t size, uint32_t crc)
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#endif
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#if defined(CRC_GENERIC) && defined(CRC_ARCH_OPTIMIZED)
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#if defined(CRC32_GENERIC) && defined(CRC32_ARCH_OPTIMIZED)
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//////////////////////////
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// Function dispatching //
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@ -197,7 +197,7 @@ lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc)
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extern LZMA_API(uint32_t)
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lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc)
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{
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#if defined(CRC_GENERIC) && defined(CRC_ARCH_OPTIMIZED)
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#if defined(CRC32_GENERIC) && defined(CRC32_ARCH_OPTIMIZED)
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// On x86-64, if CLMUL is available, it is the best for non-tiny
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// inputs, being over twice as fast as the generic slice-by-four
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// version. However, for size <= 16 it's different. In the extreme
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@ -229,7 +229,7 @@ lzma_crc32(const uint8_t *buf, size_t size, uint32_t crc)
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*/
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return crc32_func(buf, size, crc);
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#elif defined(CRC_ARCH_OPTIMIZED)
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#elif defined(CRC32_ARCH_OPTIMIZED)
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return crc32_arch_optimized(buf, size, crc);
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#else
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@ -23,7 +23,7 @@
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#endif
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#ifdef CRC_GENERIC
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#ifdef CRC64_GENERIC
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/////////////////////////////////
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// Generic slice-by-four CRC64 //
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@ -85,7 +85,7 @@ crc64_generic(const uint8_t *buf, size_t size, uint64_t crc)
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#endif
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#if defined(CRC_GENERIC) && defined(CRC_ARCH_OPTIMIZED)
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#if defined(CRC64_GENERIC) && defined(CRC64_ARCH_OPTIMIZED)
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//////////////////////////
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// Function dispatching //
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@ -154,7 +154,7 @@ lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
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extern LZMA_API(uint64_t)
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lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
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{
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#if defined(CRC_GENERIC) && defined(CRC_ARCH_OPTIMIZED)
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#if defined(CRC64_GENERIC) && defined(CRC64_ARCH_OPTIMIZED)
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#ifdef CRC_USE_GENERIC_FOR_SMALL_INPUTS
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if (size <= 16)
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@ -162,7 +162,7 @@ lzma_crc64(const uint8_t *buf, size_t size, uint64_t crc)
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#endif
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return crc64_func(buf, size, crc);
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#elif defined(CRC_ARCH_OPTIMIZED)
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#elif defined(CRC64_ARCH_OPTIMIZED)
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// If arch-optimized version is used unconditionally without runtime
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// CPU detection then omitting the generic version and its 8 KiB
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// lookup table makes the library smaller.
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@ -48,14 +48,48 @@
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# define crc_attr_no_sanitize_address
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#endif
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// Keep this in sync with changes to crc32_arm64.h
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#if defined(_WIN32) || defined(HAVE_GETAUXVAL) \
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|| defined(HAVE_ELF_AUX_INFO) \
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|| (defined(__APPLE__) && defined(HAVE_SYSCTLBYNAME))
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# define ARM64_RUNTIME_DETECTION 1
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#endif
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#undef CRC_GENERIC
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#undef CRC_ARCH_OPTIMIZED
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#undef CRC32_GENERIC
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#undef CRC64_GENERIC
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#undef CRC32_ARCH_OPTIMIZED
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#undef CRC64_ARCH_OPTIMIZED
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// The x86 CLMUL is used for both CRC32 and CRC64.
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#undef CRC_X86_CLMUL
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#undef CRC32_ARM64
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#undef CRC64_ARM64_CLMUL
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#undef CRC_USE_IFUNC
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#undef CRC_USE_GENERIC_FOR_SMALL_INPUTS
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// ARM64 CRC32 instruction is only useful for CRC32. Currently, only
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// little endian is supported since we were unable to test on a big
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// endian machine.
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#if defined(HAVE_ARM64_CRC32) && !defined(WORDS_BIGENDIAN)
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// Allow ARM64 CRC32 instruction without a runtime check if
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// __ARM_FEATURE_CRC32 is defined. GCC and Clang only define this if the
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// proper compiler options are used.
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# if defined(__ARM_FEATURE_CRC32)
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# define CRC32_ARCH_OPTIMIZED 1
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# define CRC32_ARM64 1
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# elif defined(ARM64_RUNTIME_DETECTION)
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# define CRC32_ARCH_OPTIMIZED 1
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# define CRC32_ARM64 1
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# define CRC32_GENERIC 1
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# endif
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#endif
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#if defined(HAVE_USABLE_CLMUL)
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// If CLMUL is allowed unconditionally in the compiler options then the
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// generic version can be omitted. Note that this doesn't work with MSVC
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// as I don't know how to detect the features here.
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@ -63,39 +97,45 @@
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// NOTE: Keep this this in sync with crc32_table.c.
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# if (defined(__SSSE3__) && defined(__SSE4_1__) && defined(__PCLMUL__)) \
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|| (defined(__e2k__) && __iset__ >= 6)
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# define CRC_ARCH_OPTIMIZED 1
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# define CRC32_ARCH_OPTIMIZED 1
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# define CRC64_ARCH_OPTIMIZED 1
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# define CRC_X86_CLMUL 1
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#elif (defined(__aarch64__))
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# define CRC_ARCH_OPTIMIZED 1
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# define CRC32_ARM64 1
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// If CLMUL cannot be used then only the generic slice-by-eight (CRC32)
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// or slice-by-four (CRC64) is built.
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#elif !defined(HAVE_USABLE_CLMUL)
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# define CRC_GENERIC 1
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// Otherwise build both and detect at runtime which version to use.
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# else
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# define CRC_GENERIC 1
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# define CRC_ARCH_OPTIMIZED 1
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# define CRC32_GENERIC 1
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# define CRC64_GENERIC 1
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# define CRC32_ARCH_OPTIMIZED 1
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# define CRC64_ARCH_OPTIMIZED 1
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# define CRC_X86_CLMUL 1
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# define CRC32_ARM64 1
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# ifdef HAVE_FUNC_ATTRIBUTE_IFUNC
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# define CRC_USE_IFUNC 1
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# endif
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/*
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// The generic code is much faster with 1-8-byte inputs and has
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// similar performance up to 16 bytes at least in microbenchmarks
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// (it depends on input buffer alignment too). If both versions are
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// built, this #define will use the generic version for inputs up to
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// 16 bytes and CLMUL for bigger inputs. It saves a little in code
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// size since the special cases for 0-16-byte inputs will be omitted
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// The generic code is much faster with 1-8-byte inputs and
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// has similar performance up to 16 bytes at least in
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// microbenchmarks (it depends on input buffer alignment
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// too). If both versions are built, this #define will use
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// the generic version for inputs up to 16 bytes and CLMUL
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// for bigger inputs. It saves a little in code size since
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// the special cases for 0-16-byte inputs will be omitted
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// from the CLMUL code.
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# ifndef CRC_USE_IFUNC
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# define CRC_USE_GENERIC_FOR_SMALL_INPUTS 1
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# endif
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*/
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# endif
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#endif
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// For CRC32 use the generic slice-by-eight implementation if no optimized
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// version is available.
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#if !defined(CRC32_ARCH_OPTIMIZED) && !defined(CRC32_GENERIC)
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# define CRC32_GENERIC 1
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#endif
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// For CRC64 use the generic slice-by-four implementation if no optimized
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// version is available.
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#if !defined(CRC64_ARCH_OPTIMIZED) && !defined(CRC64_GENERIC)
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# define CRC64_GENERIC 1
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#endif
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#endif
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