[Bug tree-optimization/103079] [12 Regression] wrong code at -Os and -O2 on x86_64-linux-gnu (the generated code hangs) since r12-4871-g502ffb1f389011b2

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103079

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andrew Macleod <amacl...@gcc.gnu.org>:

https://gcc.gnu.org/g:004afb984beb6efbe25f44a5857b1c27ebc2ec82

commit r12-4921-g004afb984beb6efbe25f44a5857b1c27ebc2ec82
Author: Andrew MacLeod <amacl...@redhat.com>
Date:   Thu Nov 4 11:07:28 2021 -0400

    Treat undefined operands as varying in GORI.

    If the LHS is UNDEFINED simply stop calculating.  Treat op1 and op2
    as VARYING if they are UNDEFINED.

            PR tree-optimization/103079
            gcc/
            * gimple-range-gori.cc (gimple_range_calc_op1): Treat undefined as
            varying.
            (gimple_range_calc_op2): Ditto.

            gcc/testsuite/
            * gcc.dg/pr103079.c: New.