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Add, optional, support for 128bit integers.

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We will, for the foreseeable future, not expose 128 bit datatypes to
SQL. But being able to use 128bit math will allow us, in a later patch,
to use 128bit accumulators for some aggregates; leading to noticeable
speedups over using numeric.

So far we only detect a gcc/clang extension that supports 128bit math,
but no 128bit literals, and no *printf support. We might want to expand
this in the future to further compilers; if there are any that that
provide similar support.

Discussion: 544BB5F1.50709@proxel.se
Author: Andreas Karlsson, with significant editorializing by me
Reviewed-By: Peter Geoghegan, Oskari Saarenmaa
This commit is contained in:
Andres Freund
2015-03-20 10:26:17 +01:00
parent 7e9ed623d9
commit 8122e1437e
6 changed files with 109 additions and 0 deletions
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3
configure.in
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@@ -1771,6 +1771,9 @@ AC_CHECK_TYPES([int8, uint8, int64, uint64], [], [],
# C, but is missing on some old platforms.
AC_CHECK_TYPES(sig_atomic_t, [], [], [#include <signal.h>])
# Check for extensions offering the integer scalar type __int128.
PGAC_TYPE_128BIT_INT
# Check for various atomic operations now that we have checked how to declare
# 64bit integers.
PGAC_HAVE_GCC__SYNC_CHAR_TAS