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Merge pull request #11391 from agraf/fix-aarch64-crc-v3

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AArch64: Detect crc32 extension support from assembler

Reviewed-by: Yazen Ghannam <yazen.ghannam@linaro.org>
Reviewed-by: Kefu Chai <kchai@redhat.com>
This commit is contained in:
Kefu Chai 2016-10-13 22:44:04 +08:00 committed by GitHub
commit 0f85b344b3
3 changed files with 16 additions and 3 deletions
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15
cmake/modules/SIMDExt.cmake
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@ -16,9 +16,20 @@
if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64|AARCH64")
set(HAVE_ARM 1)
CHECK_C_COMPILER_FLAG(-march=armv8-a+crc HAVE_ARMV8_CRC)
set(save_quiet ${CMAKE_REQUIRED_QUIET})
set(CMAKE_REQUIRED_QUIET true)
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("
#define CRC32CX(crc, value) __asm__(\"crc32cx %w[c], %w[c], %x[v]\":[c]\"+r\"(crc):[v]\"r\"(value))
asm(\".arch_extension crc\");
unsigned int foo(unsigned int ret) {
CRC32CX(ret, 0);
return ret;
}
int main() { foo(0); }" HAVE_ARMV8_CRC)
set(CMAKE_REQUIRED_QUIET ${save_quiet})
if(HAVE_ARMV8_CRC)
set(ARM_CRC_FLAGS "-march=armv8-a+crc")
message(STATUS " aarch64 crc extensions supported")
endif()
CHECK_C_COMPILER_FLAG(-march=armv8-a+simd HAVE_ARMV8_SIMD)
if(HAVE_ARMV8_SIMD)

1
src/CMakeLists.txt
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@ -484,7 +484,6 @@ set_source_files_properties(${CMAKE_SOURCE_DIR}/src/ceph_ver.c
include(SIMDExt)
if(HAVE_ARMV8_CRC)
add_library(common_crc_aarch64 STATIC common/crc32c_aarch64.c)
set_target_properties(common_crc_aarch64 PROPERTIES COMPILE_FLAGS "${CMAKE_C_FLAGS} ${ARM_CRC_FLAGS}")
target_link_libraries(common common_crc_aarch64)
endif(HAVE_ARMV8_CRC)

3
src/common/crc32c_aarch64.c
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@ -2,6 +2,9 @@
#include "include/int_types.h"
#include "common/crc32c_aarch64.h"
/* Request crc extension capabilities from the assembler */
asm(".arch_extension crc");
#define CRC32CX(crc, value) __asm__("crc32cx %w[c], %w[c], %x[v]":[c]"+r"(crc):[v]"r"(value))
#define CRC32CW(crc, value) __asm__("crc32cw %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))
#define CRC32CH(crc, value) __asm__("crc32ch %w[c], %w[c], %w[v]":[c]"+r"(crc):[v]"r"(value))