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These opcodes have been around in the AMD world since 2007, and 2008 in the case of intel. They're supported in GCC and Clang via some __builtin macros. The opcodes may be unavailable during runtime, in which case we fall back on a C-based implementation of the code. In order to get the POPCNT instruction we must pass the -mpopcnt option to the compiler. We do this only for the pg_bitutils.c file. David Rowley (with fragments taken from a patch by Thomas Munro) Discussion: https://postgr.es/m/CAKJS1f9WTAGG1tPeJnD18hiQW5gAk59fQ6WK-vfdAKEHyRg2RA@mail.gmail.com |
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| ac_func_accept_argtypes.m4 | ||
| ax_prog_perl_modules.m4 | ||
| ax_pthread.m4 | ||
| c-compiler.m4 | ||
| c-library.m4 | ||
| check_decls.m4 | ||
| config.guess | ||
| config.sub | ||
| docbook.m4 | ||
| general.m4 | ||
| install-sh | ||
| libtool.m4 | ||
| llvm.m4 | ||
| Makefile | ||
| missing | ||
| perl.m4 | ||
| pkg.m4 | ||
| prep_buildtree | ||
| programs.m4 | ||
| python.m4 | ||
| tcl.m4 | ||