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Subject: [Bug tree-optimization/98640] [10/11 Regression] GCC produces
 incorrect code with -O1 and higher since r10-2711-g3ed01d5408045d80
Date: Wed, 13 Jan 2021 10:13:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98640

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:ffd28c265e6d611983cd27e9332dc799039a3f04

commit r11-6632-gffd28c265e6d611983cd27e9332dc799039a3f04
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Jan 13 09:43:52 2021 +0100

    tree-optimization/98640 - fix bogus sign-extension with VN

    VN tried to express a sign extension from int to long of
    a trucated quantity with a plain conversion but that loses the
    truncation.  Since there's no single operand doing truncate plus
    sign extend (there was a proposed SEXT_EXPR to do that at some
    point mapping to RTL sign_extract) don't bother to appropriately
    model this with two ops (which the VN insert machinery doesn't
    handle and which is unlikely to CSE fully).

    2021-01-13  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/98640
            * tree-ssa-sccvn.c (visit_nary_op): Do not try to
            handle plus or minus from a truncated operand to be
            sign-extended.

            * gcc.dg/torture/pr98640.c: New testcase.=