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# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0.
include(CheckCSourceRuns)
include(AwsCFlags)
option(USE_CPU_EXTENSIONS "Whenever possible, use functions optimized for CPUs with specific extensions (ex: SSE, AVX)." ON)
# In the current (11/2/21) state of mingw64, the packaged gcc is not capable of emitting properly aligned avx2 instructions under certain circumstances.
# This leads to crashes for windows builds using mingw64 when invoking the avx2-enabled versions of certain functions. Until we can find a better
# work-around, disable avx2 (and all other extensions) in mingw builds.
#
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54412
#
if(MINGW)
message(STATUS "MINGW detected! Disabling avx2 and other CPU extensions")
set(USE_CPU_EXTENSIONS OFF)
endif()
if(NOT CMAKE_CROSSCOMPILING)
check_c_source_runs("
#include <stdbool.h>
bool foo(int a, int b, int *c) {
return __builtin_mul_overflow(a, b, c);
}
int main() {
int out;
if (foo(1, 2, &out)) {
return 0;
}
return 0;
}" AWS_HAVE_GCC_OVERFLOW_MATH_EXTENSIONS)
endif()
check_c_source_compiles("
#include <windows.h>
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
int main() {
return 0;
}
#else
it's not windows desktop
#endif
" AWS_HAVE_WINAPI_DESKTOP)
check_c_source_compiles("
int main() {
#if !(defined(__x86_64__) || defined(__i386__) || defined(_M_X64) || defined(_M_IX86))
# error \"not intel\"
#endif
return 0;
}
" AWS_ARCH_INTEL)
check_c_source_compiles("
int main() {
#if !(defined(__aarch64__) || defined(_M_ARM64))
# error \"not arm64\"
#endif
return 0;
}
" AWS_ARCH_ARM64)
check_c_source_compiles("
int main() {
#if !(defined(__arm__) || defined(_M_ARM))
# error \"not arm\"
#endif
return 0;
}
" AWS_ARCH_ARM32)
check_c_source_compiles("
int main() {
int foo = 42, bar = 24;
__asm__ __volatile__(\"\":\"=r\"(foo):\"r\"(bar):\"memory\");
}" AWS_HAVE_GCC_INLINE_ASM)
check_c_source_compiles("
#include <sys/auxv.h>
int main() {
#ifdef __linux__
getauxval(AT_HWCAP);
getauxval(AT_HWCAP2);
#endif
return 0;
}" AWS_HAVE_AUXV)
string(REGEX MATCH "^(aarch64|arm)" ARM_CPU "${CMAKE_SYSTEM_PROCESSOR}")
if(NOT LEGACY_COMPILER_SUPPORT OR ARM_CPU)
check_c_source_compiles("
#include <execinfo.h>
#include <stdlib.h>
int main() {
backtrace(NULL, 0);
return 0;
}" AWS_HAVE_EXECINFO)
endif()
check_c_source_compiles("
#include <linux/if_link.h>
int main() {
return 1;
}" AWS_HAVE_LINUX_IF_LINK_H)
if(MSVC)
check_c_source_compiles("
#include <intrin.h>
int main() {
unsigned __int64 a = 0x0fffffffffffffffI64;
unsigned __int64 b = 0xf0000000I64;
unsigned __int64 c, d;
d = _umul128(a, b, &c);
return 0;
}" AWS_HAVE_MSVC_INTRINSICS_X64)
endif()
# This does a lot to detect when intrinsics are available and has to set cflags to do so.
# leave it in its own file for ease of managing it.
include(AwsSIMD)
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