Provide overflow safe integer math inline functions.
It's not easy to get signed integer overflow checks correct and
fast. Therefore abstract the necessary infrastructure into a common
header providing addition, subtraction and multiplication for 16, 32,
64 bit signed integers.
The new macros aren't yet used, but a followup commit will convert
several open coded overflow checks.
Author: Andres Freund, with some code stolen from Greg Stark
Reviewed-By: Robert Haas
Discussion: https://postgr.es/m/20171024103954.ztmatprlglz3rwke@alap3.anarazel.de
Branch
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master
Details
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https://git.postgresql.org/pg/commitdiff/4d6ad31257adaf8a51e1c4377d96afa656d9165f
Modified Files
--------------
config/c-compiler.m4 | 22 ++++
configure | 33 ++++++
configure.in | 4 +
src/include/common/int.h | 239 ++++++++++++++++++++++++++++++++++++++++++
src/include/pg_config.h.in | 3 +
src/include/pg_config.h.win32 | 3 +
6 files changed, 304 insertions(+)
