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Add test for checking if -march=native needs -mfpu=neon for 32-bit ARM.

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Mika Lindqvist 2024-02-21 16:02:20 +02:00 committed by Hans Kristian Rosbach
parent 1d08728c52
commit 93b870fbef
1 changed files with 40 additions and 0 deletions
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40
cmake/detect-intrinsics.cmake
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@ -196,6 +196,46 @@ macro(check_neon_compiler_flag)
#endif
int main() { return 0; }"
NEON_AVAILABLE FAIL_REGEX "not supported")
# Check whether compiler native flag is enough for NEON support
# Some GCC versions don't enable FPU (vector unit) when using -march=native
if(NEON_AVAILABLE AND NATIVEFLAG AND (NOT "${ARCH}" MATCHES "aarch64"))
check_c_source_compiles(
"#include <arm_neon.h>
uint8x16_t f(uint8x16_t x, uint8x16_t y) {
return vaddq_u8(x, y);
}
int main(int argc, char* argv[]) {
uint8x16_t a = vdupq_n_u8(argc);
uint8x16_t b = vdupq_n_u8(argc);
uint8x16_t result = f(a, b);
return result[0];
}"
ARM_NEON_SUPPORT_NATIVE
)
if(NOT ARM_NEON_SUPPORT_NATIVE)
set(CMAKE_REQUIRED_FLAGS "${NATIVEFLAG} -mfpu=neon ${ZNOLTOFLAG}")
check_c_source_compiles(
"#include <arm_neon.h>
uint8x16_t f(uint8x16_t x, uint8x16_t y) {
return vaddq_u8(x, y);
}
int main(int argc, char* argv[]) {
uint8x16_t a = vdupq_n_u8(argc);
uint8x16_t b = vdupq_n_u8(argc);
uint8x16_t result = f(a, b);
return result[0];
}"
ARM_NEON_SUPPORT_NATIVE_MFPU
)
if(ARM_NEON_SUPPORT_NATIVE_MFPU)
set(NEONFLAG "-mfpu=neon")
else()
# Remove local NEON_AVAILABLE variable and overwrite the cache
unset(NEON_AVAILABLE)
set(NEON_AVAILABLE "" CACHE INTERNAL "NEON support available" FORCE)
endif()
endif()
endif()
set(CMAKE_REQUIRED_FLAGS)
endmacro()