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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/102245] [12 Regression] false  int-in-bool-context warning
 with shift
Date: Wed, 08 Sep 2021 22:38:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102245

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
So, seems the binary context is result of shorten_binary_op, we see the
1L and (((int)x) << 0) operands of BIT_AND_EXPR, result_type is therefore l=
ong
int and shorten_binary_op uses convert to convert that (((int)x) << 0) to l=
ong
int and triggers the match.pd rule and folds it into (long int)x (where x h=
as
_Bool type).
shorten_binary_op then decides to return _Bool type, which is why we have t=
he
bool context.=