Add basic support for using the POPCNT and SSE4.2s LZCNT opcodes
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
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/711bab1e4d19b5c9967328315a542d93386b1ac5
Modified Files
--------------
config/c-compiler.m4 | 116 +++++++
configure | 155 ++++++++++
configure.in | 8 +
src/Makefile.global.in | 1 +
src/backend/access/heap/visibilitymap.c | 73 ++---
src/backend/lib/bloomfilter.c | 15 +-
src/backend/nodes/bitmapset.c | 131 ++------
src/include/pg_config.h.in | 18 ++
src/include/pg_config.h.win32 | 18 ++
src/include/port/pg_bitutils.h | 26 ++
src/port/Makefile | 5 +-
src/port/pg_bitutils.c | 516 ++++++++++++++++++++++++++++++++
src/tools/msvc/Mkvcbuild.pm | 1 +
13 files changed, 914 insertions(+), 169 deletions(-)
