Doc: mention platform-dependent behavior of bitshift operators There have been several recent complaints that << and >> don't behave the same way on all supported platforms. There is a risk that << overflows the signed integer type, which is undefined behavior, and there are platform-dependent behaviors from shifting by numbers of bits >= the bitwidth of the type, and also from shifting by negative values.
Document this to warn unsuspecting users of these facts. Author: David Rowley <[email protected]> Reviewed-by: Tom Lane <[email protected]> Discussion: https://postgr.es/m/CAApHDvr0O6ZF8NO=Rq9Q+Sz=FHT=nz1kkntxzdcnph-owuk...@mail.gmail.com Backpatch-through: 14 Branch ------ REL_17_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/2250163c3964eec31eef74182f5bd772d4adb543 Modified Files -------------- doc/src/sgml/func.sgml | 7 +++++++ 1 file changed, 7 insertions(+)
