Speed up CRC32 calculation on ARM64

The CRC32 instructions in ARM64 can calculate the CRC32 result
for 8 bytes in a single operation, making the use of ARM64
instructions much faster compared to the general CRC32 algorithm.

Optimized CRC32 will be enabled if ARM64 has CRC extension
running on Linux.

Signed-off-by: Chenxi Mao <chenxi.mao2013@gmail.com>
This commit is contained in:
Chenxi Mao 2024-01-09 17:23:11 +08:00 committed by Jia Tan
parent b43c3e48bf
commit 849d0f282a
6 changed files with 130 additions and 9 deletions

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@ -230,6 +230,7 @@ add_library(liblzma
src/liblzma/check/check.h
src/liblzma/check/crc_common.h
src/liblzma/check/crc_x86_clmul.h
src/liblzma/check/crc32_aarch64.h
src/liblzma/common/block_util.c
src/liblzma/common/common.c
src/liblzma/common/common.h

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@ -15,7 +15,8 @@ liblzma_la_SOURCES += \
check/check.c \
check/check.h \
check/crc_common.h \
check/crc_x86_clmul.h
check/crc_x86_clmul.h \
check/crc32_aarch64.h
if COND_SMALL
liblzma_la_SOURCES += check/crc32_small.c

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@ -0,0 +1,109 @@
///////////////////////////////////////////////////////////////////////////////
//
/// \file crc32_aarch64.c
/// \brief CRC32 calculation with aarch64 optimization
//
// Authors: Chenxi Mao
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#ifdef LZMA_CRC_CRC32_AARCH64_H
# error crc_arm64_clmul.h was included twice.
#endif
#define LZMA_CRC_CRC32_AARCH64_H
#include <sys/auxv.h>
// EDG-based compilers (Intel's classic compiler and compiler for E2K) can
// define __GNUC__ but the attribute must not be used with them.
// The new Clang-based ICX needs the attribute.
//
// NOTE: Build systems check for this too, keep them in sync with this.
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
# define crc_attr_target \
__attribute__((__target__("+crc")))
#else
# define crc_attr_target
#endif
#ifdef BUILDING_CRC32_AARCH64
crc_attr_target
crc_attr_no_sanitize_address
static uint32_t
crc32_arch_optimized(const uint8_t *buf, size_t size, uint32_t crc)
{
crc = ~crc;
while ((uintptr_t)(buf) & 7) {
crc = __builtin_aarch64_crc32b(crc, *buf);
buf++;
size--;
}
for (;size>=8;size-=8,buf+=8) {
crc = __builtin_aarch64_crc32x(crc, aligned_read64le(buf));
}
for (;size>0;size--,buf++)
crc = __builtin_aarch64_crc32b(crc, *buf);
return ~crc;
}
#endif
#ifdef BUILDING_CRC64_AARCH64
//FIXME: there is no crc64_arch_optimized implementation,
// to make compiler happy, add crc64_generic here.
#ifdef WORDS_BIGENDIAN
# define A1(x) ((x) >> 56)
#else
# define A1 A
#endif
crc_attr_target
crc_attr_no_sanitize_address
static uint64_t
crc64_arch_optimized(const uint8_t *buf, size_t size, uint64_t crc)
{
crc = ~crc;
#ifdef WORDS_BIGENDIAN
crc = bswap64(crc);
#endif
if (size > 4) {
while ((uintptr_t)(buf) & 3) {
crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
--size;
}
const uint8_t *const limit = buf + (size & ~(size_t)(3));
size &= (size_t)(3);
while (buf < limit) {
#ifdef WORDS_BIGENDIAN
const uint32_t tmp = (uint32_t)(crc >> 32)
^ aligned_read32ne(buf);
#else
const uint32_t tmp = (uint32_t)crc
^ aligned_read32ne(buf);
#endif
buf += 4;
crc = lzma_crc64_table[3][A(tmp)]
^ lzma_crc64_table[2][B(tmp)]
^ S32(crc)
^ lzma_crc64_table[1][C(tmp)]
^ lzma_crc64_table[0][D(tmp)];
}
}
while (size-- != 0)
crc = lzma_crc64_table[0][*buf++ ^ A1(crc)] ^ S8(crc);
#ifdef WORDS_BIGENDIAN
crc = bswap64(crc);
#endif
return ~crc;
}
#endif
static inline bool
is_arch_extension_supported(void)
{
return (getauxval(AT_HWCAP) & HWCAP_CRC32)!=0;
}

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@ -15,9 +15,12 @@
#include "check.h"
#include "crc_common.h"
#ifdef CRC_X86_CLMUL
#if defined(CRC_X86_CLMUL)
# define BUILDING_CRC32_CLMUL
# include "crc_x86_clmul.h"
#elif defined(CRC32_ARM64)
# define BUILDING_CRC32_AARCH64
# include "crc32_aarch64.h"
#endif

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@ -14,9 +14,12 @@
#include "check.h"
#include "crc_common.h"
#ifdef CRC_X86_CLMUL
#if defined(CRC_X86_CLMUL)
# define BUILDING_CRC64_CLMUL
# include "crc_x86_clmul.h"
#elif defined(CRC32_ARM64)
# define BUILDING_CRC64_AARCH64
# include "crc32_aarch64.h"
#endif

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@ -52,29 +52,33 @@
#undef CRC_GENERIC
#undef CRC_ARCH_OPTIMIZED
#undef CRC_X86_CLMUL
#undef CRC32_ARM64
#undef CRC_USE_IFUNC
#undef CRC_USE_GENERIC_FOR_SMALL_INPUTS
// If CLMUL cannot be used then only the generic slice-by-eight (CRC32)
// or slice-by-four (CRC64) is built.
#if !defined(HAVE_USABLE_CLMUL)
# define CRC_GENERIC 1
// 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.
//
// NOTE: Keep this this in sync with crc32_table.c.
#elif (defined(__SSSE3__) && defined(__SSE4_1__) && defined(__PCLMUL__)) \
#if (defined(__SSSE3__) && defined(__SSE4_1__) && defined(__PCLMUL__)) \
|| (defined(__e2k__) && __iset__ >= 6)
# define CRC_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 CRC_X86_CLMUL 1
# define CRC32_ARM64 1
# ifdef HAVE_FUNC_ATTRIBUTE_IFUNC
# define CRC_USE_IFUNC 1