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CMake: Add support for ARM64 CRC32 instruction detection.
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@ -1007,6 +1007,56 @@ calculation if supported by the system" ON)
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endif()
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endif()
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endif()
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endif()
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# ARM64 C Language Extensions define CRC32 functions in arm_acle.h.
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# These are supported by at least GCC and Clang which both need
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# __attribute__((__target__("+crc"))), unless the needed compiler flags
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# are used to support the CRC instruction.
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option(ALLOW_ARM64_CRC32 "Allow ARM64 CRC32 instruction if supported by \
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the system" ON)
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if(ALLOW_ARM64_CRC32)
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check_c_source_compiles("
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#include <stdint.h>
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#ifndef _MSC_VER
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#include <arm_acle.h>
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#endif
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#if (defined(__GNUC__) || defined(__clang__)) && !defined(__EDG__)
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__attribute__((__target__(\"+crc\")))
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#endif
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uint32_t my_crc(uint32_t a, uint64_t b)
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{
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return __crc32d(a, b);
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}
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int main(void) { return 0; }
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"
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HAVE_ARM64_CRC32)
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if(HAVE_ARM64_CRC32)
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target_compile_definitions(liblzma PRIVATE HAVE_ARM64_CRC32)
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# Check for ARM64 CRC32 instruction runtime detection.
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# getauxval() is supported on Linux.
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check_symbol_exists(getauxval sys/auxv.h HAVE_GETAUXVAL)
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tuklib_add_definition_if(liblzma HAVE_GETAUXVAL)
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# elf_aux_info() is supported on FreeBSD.
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check_symbol_exists(elf_aux_info sys/auxv.h HAVE_ELF_AUX_INFO)
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tuklib_add_definition_if(liblzma HAVE_ELF_AUX_INFO)
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# sysctlbyname("hw.optional.armv8_crc32", ...) is supported on Darwin
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# (macOS, iOS, etc.). Note that sysctlbyname() is supported on FreeBSD,
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# NetBSD, and possibly others too but the string is specific to
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# Apple OSes. The C code is responsible for checking
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# defined(__APPLE__) before using
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# sysctlbyname("hw.optional.armv8_crc32", ...).
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check_symbol_exists(sysctlbyname sys/sysctl.h HAVE_SYSCTLBYNAME)
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tuklib_add_definition_if(liblzma HAVE_SYSCTLBYNAME)
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endif()
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endif()
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# Support -fvisiblity=hidden when building shared liblzma.
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# Support -fvisiblity=hidden when building shared liblzma.
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# These lines do nothing on Windows (even under Cygwin).
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# These lines do nothing on Windows (even under Cygwin).
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# HAVE_VISIBILITY should always be defined to 0 or 1.
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# HAVE_VISIBILITY should always be defined to 0 or 1.
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