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Heikki Linnakangas f044d71e33 Use ARMv8 CRC instructions where available. ... ARMv8 introduced special CPU instructions for calculating CRC-32C. Use them, when available, for speed. Like with the similar Intel CRC instructions, several factors affect whether the instructions can be used. The compiler intrinsics for them must be supported by the compiler, and the instructions must be supported by the target architecture. If the compilation target architecture does not support the instructions, but adding "-march=armv8-a+crc" makes them available, then we compile the code with a runtime check to determine if the host we're running on supports them or not. For the runtime check, use glibc getauxval() function. Unfortunately, that's not very portable, but I couldn't find any more portable way to do it. If getauxval() is not available, the CRC instructions will still be used if the target architecture supports them without any additional compiler flags, but the runtime check will not be available. Original patch by Yuqi Gu, heavily modified by me. Reviewed by Andres Freund, Thomas Munro. Discussion: https://www.postgresql.org/message-id/HE1PR0801MB1323D171938EABC04FFE7FA9E3110%40HE1PR0801MB1323.eurprd08.prod.outlook.com		8 years ago
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Makefile	…
ac_func_accept_argtypes.m4	Remove some configure header-file checks that we weren't really using.	9 years ago
ax_prog_perl_modules.m4	Make configure check for IPC::Run when --enable-tap-tests is specified.	9 years ago
ax_pthread.m4	…
c-compiler.m4	Use ARMv8 CRC instructions where available.	8 years ago
c-library.m4	C comments: "a" <--> "an" corrections	8 years ago
config.guess	Update config.guess and config.sub	9 years ago
config.sub	Update config.guess and config.sub	9 years ago
docbook.m4	Convert documentation to DocBook XML	8 years ago
general.m4	…
install-sh	…
libtool.m4	…
llvm.m4	Add configure infrastructure (--with-llvm) to enable LLVM support.	8 years ago
missing	…
perl.m4	MSVC: Test whether 32-bit Perl needs -D_USE_32BIT_TIME_T.	8 years ago
pkg.m4	ICU support	9 years ago
prep_buildtree	…
programs.m4	Further improve consistency of configure's program searching.	9 years ago
python.m4	Teach configure --with-python to report the Python version number.	8 years ago
tcl.m4	Further improve consistency of configure's program searching.	9 years ago