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liblzma: Rename crc32_aarch64.h to crc32_arm64.h.

Even though the proper name for the architecture is aarch64, this
project uses ARM64 throughout. So the rename is for consistency.

Additionally, crc32_arm64.h was slightly refactored for the following
changes:

   * Added MSVC, FreeBSD, and macOS support in
     is_arch_extension_supported().

   * crc32_arch_optimized() now checks the size when aligning the
     buffer.

   * crc32_arch_optimized() loop conditions were slightly modified to
     avoid both decrementing the size and incrementing the buffer
     pointer.

   * Use the intrinsic wrappers defined in <arm_acle.h> because GCC and
     Clang name them differently.

   * Minor spacing and comment changes.
This commit is contained in:
Jia Tan 2024-01-22 20:54:56 +08:00
parent 455a08609c
commit 761f5b69a4
6 changed files with 122 additions and 116 deletions

View file

@ -230,7 +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/check/crc32_arm64.h
src/liblzma/common/block_util.c
src/liblzma/common/common.c
src/liblzma/common/common.h

View file

@ -16,7 +16,7 @@ liblzma_la_SOURCES += \
check/check.h \
check/crc_common.h \
check/crc_x86_clmul.h \
check/crc32_aarch64.h
check/crc32_arm64.h
if COND_SMALL
liblzma_la_SOURCES += check/crc32_small.c

View file

@ -1,109 +0,0 @@
///////////////////////////////////////////////////////////////////////////////
//
/// \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;
}

View file

@ -0,0 +1,119 @@
///////////////////////////////////////////////////////////////////////////////
//
/// \file crc32_arm64.h
/// \brief CRC32 calculation with ARM64 optimization
//
// Authors: Chenxi Mao
// Jia Tan
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef LZMA_CRC32_ARM64_H
#define LZMA_CRC32_ARM64_H
// MSVC always has the CRC intrinsics available when building for ARM64
// there is no need to include any header files.
#ifndef _MSC_VER
# include <arm_acle.h>
#endif
#if defined(CRC32_GENERIC) && defined(CRC32_ARCH_OPTIMIZED)
# if defined(HAVE_GETAUXVAL) || defined(HAVE_ELF_AUX_INFO)
# include <sys/auxv.h>
# elif defined(_WIN32)
# include <processthreadsapi.h>
# elif defined(__APPLE__) && defined(HAVE_SYSCTLBYNAME)
# include <sys/sysctl.h>
# endif
#endif
// Some EDG-based compilers support ARM64 and define __GNUC__
// (such as Nvidia's nvcc), but do not support function attributes.
//
// 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
crc_attr_target
static uint32_t
crc32_arch_optimized(const uint8_t *buf, size_t size, uint32_t crc)
{
crc = ~crc;
// Align the input buffer because this was shown to be
// significantly faster than unaligned accesses.
const size_t align_amount = my_min(size, (8 - (uintptr_t)buf) & 7);
for (const uint8_t *limit = buf + align_amount; buf < limit; ++buf)
crc = __crc32b(crc, *buf);
size -= align_amount;
// Process 8 bytes at a time. The end point is determined by
// ignoring the least significant three bits of size to ensure
// we do not process past the bounds of the buffer. This guarentees
// that limit is a multiple of 8 and is strictly less than size.
for (const uint8_t *limit = buf + (size & ~((size_t)7));
buf < limit; buf += 8)
crc = __crc32d(crc, aligned_read64le(buf));
// Process the remaining bytes that are not 8 byte aligned.
for (const uint8_t *limit = buf + (size & 7); buf < limit; ++buf)
crc = __crc32b(crc, *buf);
return ~crc;
}
#if defined(CRC32_GENERIC) && defined(CRC32_ARCH_OPTIMIZED)
static inline bool
is_arch_extension_supported(void)
{
#if defined(HAVE_GETAUXVAL)
return (getauxval(AT_HWCAP) & HWCAP_CRC32) != 0;
#elif defined(HAVE_ELF_AUX_INFO)
unsigned long feature_flags;
elf_aux_info(AT_HWCAP, &feature_flags, sizeof(feature_flags));
return feature_flags & HWCAP_CRC32 != 0;
#elif defined(_WIN32)
return IsProcessorFeaturePresent(
PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE);
#elif defined(__APPLE__) && defined(HAVE_SYSCTLBYNAME)
int has_crc32 = 0;
size_t size = sizeof(has_crc32);
// The sysctlbyname() function requires a string identifier for the
// CPU feature it tests. The Apple documentation lists the string
// "hw.optional.armv8_crc32", which can be found here:
// (https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics#3915619)
int err = sysctlbyname("hw.optional.armv8_crc32", &has_crc32,
&size, NULL, 0);
return !err && has_crc32;
#else
// If a runtime detection method cannot be found, then this must
// be a compile time error. The checks in crc_common.h should ensure
// a runtime detection method is always found if this function is
// built. It would be possible to just return false here, but this
// is inefficient for binary size and runtime since only the generic
// method could ever be used.
# error Runtime detection method unavailable.
#endif
}
#endif
#endif // LZMA_CRC32_ARM64_H

View file

@ -19,8 +19,7 @@
# define BUILDING_CRC32_CLMUL
# include "crc_x86_clmul.h"
#elif defined(CRC32_ARM64)
# define BUILDING_CRC32_AARCH64
# include "crc32_aarch64.h"
# include "crc32_arm64.h"
#endif

View file

@ -17,9 +17,6 @@
#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