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liblzma: ARM64 CRC32: Tweak coding style and comments 

(cherry picked from commit d8fffd01aa)
This commit is contained in:
Lasse Collin 2024-04-10 21:55:10 +03:00
parent 38a3ec5a7e
commit 42a9482b48
1 changed files with 5 additions and 5 deletions
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10
src/liblzma/check/crc32_arm64.h
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@ -11,7 +11,6 @@
// //
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
#ifndef LZMA_CRC32_ARM64_H #ifndef LZMA_CRC32_ARM64_H
#define LZMA_CRC32_ARM64_H #define LZMA_CRC32_ARM64_H
@ -21,6 +20,8 @@
# include <arm_acle.h> # include <arm_acle.h>
#endif #endif
// If both versions are going to be built, we need runtime detection
// to check if the instructions are supported.
#if defined(CRC32_GENERIC) && defined(CRC32_ARCH_OPTIMIZED) #if defined(CRC32_GENERIC) && defined(CRC32_ARCH_OPTIMIZED)
# if defined(HAVE_GETAUXVAL) || defined(HAVE_ELF_AUX_INFO) # if defined(HAVE_GETAUXVAL) || defined(HAVE_ELF_AUX_INFO)
# include <sys/auxv.h> # include <sys/auxv.h>
@ -36,8 +37,7 @@
// //
// NOTE: Build systems check for this too, keep them in sync with this. // NOTE: Build systems check for this too, keep them in sync with this.
#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__) #if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
# define crc_attr_target \ # define crc_attr_target __attribute__((__target__("+crc")))
__attribute__((__target__("+crc")))
#else #else
# define crc_attr_target # define crc_attr_target
#endif #endif
@ -62,7 +62,7 @@ crc32_arch_optimized(const uint8_t *buf, size_t size, uint32_t crc)
// ignoring the least significant three bits of size to ensure // ignoring the least significant three bits of size to ensure
// we do not process past the bounds of the buffer. This guarantees // we do not process past the bounds of the buffer. This guarantees
// that limit is a multiple of 8 and is strictly less than size. // that limit is a multiple of 8 and is strictly less than size.
for (const uint8_t *limit = buf + (size & ~((size_t)7)); for (const uint8_t *limit = buf + (size & ~(size_t)7);
buf < limit; buf += 8) buf < limit; buf += 8)
crc = __crc32d(crc, aligned_read64le(buf)); crc = __crc32d(crc, aligned_read64le(buf));
@ -98,7 +98,7 @@ is_arch_extension_supported(void)
// The sysctlbyname() function requires a string identifier for the // The sysctlbyname() function requires a string identifier for the
// CPU feature it tests. The Apple documentation lists the string // CPU feature it tests. The Apple documentation lists the string
// "hw.optional.armv8_crc32", which can be found here: // "hw.optional.armv8_crc32", which can be found here:
// (https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics#3915619) // https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics#3915619
int err = sysctlbyname("hw.optional.armv8_crc32", &has_crc32, int err = sysctlbyname("hw.optional.armv8_crc32", &has_crc32,
&size, NULL, 0); &size, NULL, 0);