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liblzma: Omit CRC tables when not needed with ARM64 optimizations.

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This is similar to the existing x86-64 CLMUL conditions to omit the
tables. They were slightly refactored to improve readability.
This commit is contained in:
Jia Tan 2024-01-22 21:36:09 +08:00
parent 761f5b69a4
commit 1940f0ec28
3 changed files with 25 additions and 5 deletions
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18
src/liblzma/check/crc32_table.c
View file

@ -13,11 +13,23 @@
#include "common.h"
// FIXME: Compared to crc32_fast.c this has to check for __x86_64__ too
// FIXME: Compared to crc_common.h this has to check for __x86_64__ too
// so that in 32-bit builds crc32_x86.S won't break due to a missing table.
#if !defined(HAVE_ENCODERS) && ((defined(__x86_64__) && defined(__SSSE3__) \
#if (defined(__x86_64__) && defined(__SSSE3__) \
&& defined(__SSE4_1__) && defined(__PCLMUL__)) \
|| (defined(__e2k__) && __iset__ >= 6))
|| (defined(__e2k__) && __iset__ >= 6)
# define X86_CLMUL_NO_TABLE 1
#endif
#if defined(HAVE_ARM64_CRC32) \
&& !defined(WORDS_BIGENDIAN) \
&& defined(__ARM_FEATURE_CRC32)
# define ARM64_CRC32_NO_TABLE 1
#endif
#if !defined(HAVE_ENCODERS) && (defined(X86_CLMUL_NO_TABLE) \
|| defined(ARM64_CRC32_NO_TABLE_))
// No table needed. Use a typedef to avoid an empty translation unit.
typedef void lzma_crc32_dummy;

7
src/liblzma/check/crc64_table.c
View file

@ -13,11 +13,16 @@
#include "common.h"
// FIXME: Compared to crc64_fast.c this has to check for __x86_64__ too
// FIXME: Compared to crc_common.h this has to check for __x86_64__ too
// so that in 32-bit builds crc64_x86.S won't break due to a missing table.
#if (defined(__x86_64__) && defined(__SSSE3__) \
&& defined(__SSE4_1__) && defined(__PCLMUL__)) \
|| (defined(__e2k__) && __iset__ >= 6)
# define X86_CLMUL_NO_TABLE 1
#endif
#ifdef X86_CLMUL_NO_TABLE
// No table needed. Use a typedef to avoid an empty translation unit.
typedef void lzma_crc64_dummy;

5
src/liblzma/check/crc_common.h
View file

@ -75,6 +75,9 @@
// 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.
//
// NOTE: Keep this and the next check in sync with the macro
// ARM64_CRC32_NO_TABLE in crc32_table.c
#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
@ -94,7 +97,7 @@
// 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.
// NOTE: Keep this in sync with the CLMUL_NO_TABLE macro in crc32_table.c.
# if (defined(__SSSE3__) && defined(__SSE4_1__) && defined(__PCLMUL__)) \
|| (defined(__e2k__) && __iset__ >= 6)
# define CRC32_ARCH_OPTIMIZED 1