Piotr Stefaniak <postgres@piotr-stefaniak.me> writes:
> during my testing I've found cases of left-shifting negative integers
> during run-time and I was recently encouraged to post a report of them,
> so here it is (done against 960ea971e66bcd621ba88841b4cb85c7f0e7c383).
What's your concern exactly? The behavior is well-defined, at least as
long as we don't shift far enough to have integer overflow, and I believe
in most of these cases that's not possible. In int8shl etc, you just get
whatever the machine does with that, which seems fine to me; we do not
document any particular semantics for such cases.
regards, tom lane