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Subject: [Bug tree-optimization/96370] [8/9 Regression] ICE with -ffast-math
 since r7-950-g8a85cee26eabf5cf
Date: Wed, 02 Dec 2020 12:21:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96370

--- Comment #9 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:a5fff78405c3bfea287434e7711c6f10a770cb0a

commit r9-9087-ga5fff78405c3bfea287434e7711c6f10a770cb0a
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jul 30 10:24:42 2020 +0200

    tree-optimization/96370 - make reassoc expr rewrite more robust

    In the face of the more complex tricks in reassoc with respect
    to negate processing it can happen that the expression rewrite
    is fooled to recurse on a leaf and pick up a bogus expression
    code.  The following patch makes the expression rewrite more
    robust in providing the expression code to it directly since
    it is the same for all operations in a chain.

    2020-07-30  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/96370
            * tree-ssa-reassoc.c (rewrite_expr_tree): Add operation
            code parameter and use it instead of picking it up from
            the stmt that is being rewritten.
            (reassociate_bb): Pass down the operation code.

            * gcc.dg/pr96370.c: New testcase.

    (cherry picked from commit 2c558d2655cb22f472c83e8296b5cd2a92365cd3)=