xz/src/liblzma/check/Makefile.inc

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## SPDX-License-Identifier: 0BSD
## Author: Lasse Collin
## Note: There is no check for COND_CHECK_CRC32 because
## currently crc32 is always enabled.
EXTRA_DIST += \
check/crc32_tablegen.c \
check/crc64_tablegen.c
liblzma_la_SOURCES += \
check/check.c \
check/check.h \
liblzma: Avoid extern lzma_crc32_clmul() and lzma_crc64_clmul(). A CLMUL-only build will have the crcxx_clmul() inlined into lzma_crcxx(). Previously a jump to the extern lzma_crcxx_clmul() was needed. Notes about shared liblzma on ELF platforms: - On platforms that support ifunc and -fvisibility=hidden, this was silly because CLMUL-only build would have that single extra jump instruction of extra overhead. - On platforms that support neither -fvisibility=hidden nor linker version script (liblzma*.map), jumping to lzma_crcxx_clmul() would go via PLT so a few more instructions of overhead (still not a big issue but silly nevertheless). There was a downside with static liblzma too: if an application only needs lzma_crc64(), static linking would make the linker include the CLMUL code for both CRC32 and CRC64 from crc_x86_clmul.o even though the CRC32 code wouldn't be needed, thus increasing code size of the executable (assuming that -ffunction-sections isn't used). Also, now compilers are likely to inline crc_simd_body() even if they don't support the always_inline attribute (or MSVC's __forceinline). Quite possibly all compilers that build the code do support such an attribute. But now it likely isn't a problem even if the attribute wasn't supported. Now all x86-specific stuff is in crc_x86_clmul.h. If other archs The other archs can then have their own headers with their own is_clmul_supported() and crcxx_clmul(). Another bonus is that the build system doesn't need to care if crc_clmul.c is needed. is_clmul_supported() stays as inline function as it's not needed when doing a CLMUL-only build (avoids a warning about unused function).
2023-10-20 20:35:10 +00:00
check/crc_common.h \
check/crc_x86_clmul.h \
check/crc32_arm64.h
if COND_SMALL
liblzma_la_SOURCES += check/crc32_small.c
else
liblzma_la_SOURCES += \
check/crc32_table.c \
check/crc32_table_le.h \
check/crc32_table_be.h
if COND_ASM_X86
liblzma_la_SOURCES += check/crc32_x86.S
else
liblzma_la_SOURCES += check/crc32_fast.c
endif
endif
if COND_CHECK_CRC64
if COND_SMALL
liblzma_la_SOURCES += check/crc64_small.c
else
liblzma_la_SOURCES += \
check/crc64_table.c \
check/crc64_table_le.h \
check/crc64_table_be.h
if COND_ASM_X86
liblzma_la_SOURCES += check/crc64_x86.S
else
liblzma_la_SOURCES += check/crc64_fast.c
endif
endif
endif
if COND_CHECK_SHA256
if COND_INTERNAL_SHA256
liblzma_la_SOURCES += check/sha256.c
endif
endif