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Subject: [Bug tree-optimization/103209] [12 Regression] wrong code at -O1 on
 x86_64-linux-gnu since r12-4324-g008e7397dad971c0
Date: Fri, 12 Nov 2021 22:56:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103209

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jan Hubicka <hubicka@gcc.gnu.org>:

https://gcc.gnu.org/g:4d2d5565a0953eaa829d10006baf007cf33bab89

commit r12-5217-g4d2d5565a0953eaa829d10006baf007cf33bab89
Author: Jan Hubicka <jh@suse.cz>
Date:   Fri Nov 12 23:55:50 2021 +0100

    Fix wrong code with pure functions

    I introduced bug into find_func_aliases_for_call in handling pure
functions.
    Instead of reading global memory pure functions are believed to write
global
    memory.  This results in misoptimization of the testcase at -O1.

    The change to pta-callused.c updates the template for new behaviour of =
the
    constraint generation. We copy nonlocal memory to calluse which is corr=
ect
but
    also not strictly necessary because later we take care to add nonlocal_p
flag
    manually.

    gcc/ChangeLog:

            PR tree-optimization/103209
            * tree-ssa-structalias.c (find_func_aliases_for_call): Fix
            use of handle_rhs_call

    gcc/testsuite/ChangeLog:

            PR tree-optimization/103209
            * gcc.dg/tree-ssa/pta-callused.c: Update template.
            * gcc.c-torture/execute/pr103209.c: New test.=