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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/95582] [11 Regression] LTO lean + PGO bootstrap is
 broken in Ada
Date: Tue, 09 Jun 2020 11:23:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95582

--- Comment #10 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Yeah, that was for vector components.  Not that I like it much.  Can
> the middle-end assume that the Ada boolean types only contain 0 or 1
> or are there other values that are supposed to be well-defined
> true or false values?

The only well-defined values are 0 and 1, but all the bits up to the precis=
ion
need to be preserved in "nonlogical contexts".  So it's a standard boolean =
type
in "logical contexts" (with binary logic) and an integral type with precisi=
on 8
in "nonlogical contexts", the possibly issues arising of course at the
transition.

In practice this works fine without special handling in almost all cases, y=
ou
just need to be careful when you're manipulating bit patterns.=