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Subject: [Bug middle-end/111699] [11/12/13 Regression] ICE: SIGSEGV: infinite
 recursion in fold_build3_loc/fold_ternary_loc/generic_simplify_VEC_COND_EXPR
Date: Sat, 07 Oct 2023 21:11:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111699

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Andrew Pinski
<pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:a63238cd52d974d364677def97d4ed70d26a7410

commit r12-9915-ga63238cd52d974d364677def97d4ed70d26a7410
Author: Andrew Pinski <pinskia@gmail.com>
Date:   Thu Oct 5 12:21:19 2023 -0700

    MATCH: Fix infinite loop between `vec_cond(vec_cond(a,b,0), c, d)` and =
`a &
b`

    Match has a pattern which converts `vec_cond(vec_cond(a,b,0), c, d)`
    into `vec_cond(a & b, c, d)` but since in this case a is a comparison
    fold will change `a & b` back into `vec_cond(a,b,0)` which causes an
    infinite loop.
    The best way to fix this is to enable the patterns for
vec_cond(*,vec_cond,*)
    only for GIMPLE so we don't get an infinite loop for fold any more.

    Note this is a latent bug since these patterns were added in
r11-2577-g229752afe3156a
    and was exposed by r14-3350-g47b833a9abe1 where now able to remove a
VIEW_CONVERT_EXPR.

    OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

            PR middle-end/111699

    gcc/ChangeLog:

            * match.pd ((c ? a : b) op d, (c ? a : b) op (c ? d : e),
            (v ? w : 0) ? a : b, c1 ? c2 ? a : b : b): Enable only for GIMP=
LE.

    gcc/testsuite/ChangeLog:

            * gcc.c-torture/compile/pr111699-1.c: New test.

    (cherry picked from commit e77428a9a336f57e3efe3eff95f2b491d7e9be14)=