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