https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90691
--- Comment #2 from Roman Lebedev <lebedev.ri at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> Confirmed.

Note that this isn't just about constants, but about the evaluation
of constant-range of the signed operand.
E.g. '(b ? 10 : 9)' is not a constant, but you know it will always be positive.

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