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Subject: [Bug middle-end/100672] wrong code with vector shift and unary minus
Date: Tue, 09 Nov 2021 13:45:38 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100672

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:cc589cc7923b048b2722980cac69463b6f2e1941

commit r9-9820-gcc589cc7923b048b2722980cac69463b6f2e1941
Author: Richard Biener <rguenther@suse.de>
Date:   Wed May 19 13:35:07 2021 +0200

    middle-end/100672 - fix bogus right shift folding

    This fixes the bogus use of TYPE_PRECISION on vector types
    from optimizing -((int)x >> 31) into (unsigned)x >> 31.

    2021-05-19  Richard Biener  <rguenther@suse.de>

            PR middle-end/100672
            * fold-const.c (fold_negate_expr_1): Use element_precision.
            (negate_expr_p): Likewise.

            * gcc.dg/torture/pr100672.c: New testcase.

    (cherry picked from commit 8d51039cb7c807ed84ff7df5416a1e3ba07a5e63)=