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authorNathan Bossart2024-08-15 20:47:31 +0000
committerNathan Bossart2024-08-15 20:47:31 +0000
commit9e9a2b7031f64e49fcaf28f21a4e70eb1212165f (patch)
treee7abac509a29b705ad76d8d5123894fe3e1bf3ba /src/tools/git-external-diff
parentad89d71978429c61647ae57174a61deb192bd51c (diff)
Remove dependence on -fwrapv semantics in a few places.
This commit attempts to update a few places, such as the money, numeric, and timestamp types, to no longer rely on signed integer wrapping for correctness. This is intended to move us closer towards removing -fwrapv, which may enable some compiler optimizations. However, there is presently no plan to actually remove that compiler option in the near future. Besides using some of the existing overflow-aware routines in int.h, this commit introduces and makes use of some new ones. Specifically, it adds functions that accept a signed integer and return its absolute value as an unsigned integer with the same width (e.g., pg_abs_s64()). It also adds functions that accept an unsigned integer, store the result of negating that integer in a signed integer with the same width, and return whether the negation overflowed (e.g., pg_neg_u64_overflow()). Finally, this commit adds a couple of tests for timestamps near POSTGRES_EPOCH_JDATE. Author: Joseph Koshakow Reviewed-by: Tom Lane, Heikki Linnakangas, Jian He Discussion: https://postgr.es/m/CAAvxfHdBPOyEGS7s%2Bxf4iaW0-cgiq25jpYdWBqQqvLtLe_t6tw%40mail.gmail.com
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