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CRC32c doc

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This commit is contained in:
tezc 2022-02-04 22:32:17 +03:00
parent a872396ef7
commit 145f8fbfc0
2 changed files with 5 additions and 4 deletions
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7
crc32/README.md
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@ -11,7 +11,7 @@
include(CheckCCompilerFlag)
include (TestBigEndian)
# detect x86
# Detect x86 and sse4.2 support
check_c_compiler_flag(-msse4.2 HAVE_CRC32_HARDWARE)
if (${HAVE_CRC32_HARDWARE})
message(STATUS "CPU have -msse4.2, defined HAVE_CRC32C")
@ -19,14 +19,15 @@ if (${HAVE_CRC32_HARDWARE})
target_compile_definitions(${PROJECT_NAME}_test PRIVATE -DHAVE_CRC32C)
endif ()
# detect aarch64
# Detect aarch64 and set march=armv8.1-a. armv7 doesn't have CRC32c instruction
# so, armv7 will be unsupported with this flag.
if (CMAKE_SYSTEM_PROCESSOR STREQUAL aarch64)
message(STATUS "CPU = aarch64, defined HAVE_CRC32C, -march=armv8.1-a")
target_compile_definitions(${PROJECT_NAME}_test PRIVATE -DHAVE_CRC32C)
target_compile_options(${PROJECT_NAME}_test PRIVATE -march=armv8.1-a)
endif()
# detect software version endianness
# Detect software version endianness
test_big_endian(HAVE_BIG_ENDIAN)
if (${HAVE_BIG_ENDIAN})
message(STATUS "System is BIG ENDIAN")

2
crc32/sc_crc32.c
View File

@ -26,7 +26,7 @@
* Version history:
* 1.0 10 Feb 2013 First version
* 1.1 1 Aug 2013 Correct comments on why three crc instructions in parallel
* 1.2 2020 added gcc intrinsics, fixed undefined behaviour
* 1.2 2020 Added gcc intrinsics, fixed undefined behaviour
* 1.3 2021 Added big endian support, added aarch64 crc32c support
*/