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[Bug c/66963] __builtin_constant_p and __builtin_choose_expr do not agree on what is a constexpr with -O2
- From: "pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 21 Jul 2015 23:26:23 +0000
- Subject: [Bug c/66963] __builtin_constant_p and __builtin_choose_expr do not agree on what is a constexpr with -O2
- Auto-submitted: auto-generated
- References: <bug-66963-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66963
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> I thought this is documented somewhere but __builtin_choose_expr only really
> accept constant literals and not constexprs.
And the main reason is the __builtin_choose_expr chooses the expression before
semantics analysis happens so the first argument needs to be a constant
literal.