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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/104376] Failure to optimize clz equivalent to
 clz
Date: Tue, 24 Oct 2023 11:17:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104376

--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Andrew Pinski <pinskia@gcc.gnu.org>:

https://gcc.gnu.org/g:0fc13e8c0e39c51e82deb93f324d9d86ad8d7460

commit r14-4889-g0fc13e8c0e39c51e82deb93f324d9d86ad8d7460
Author: Andrew Pinski <pinskia@gmail.com>
Date:   Sun Oct 15 19:15:38 2023 +0000

    Improve factor_out_conditional_operation for conversions and constants

    In the case of a NOP conversion (precisions of the 2 types are equal),
    factoring out the conversion can be done even if int_fits_type_p returns
    false and even when the conversion is defined by a statement inside the
    conditional. Since it is a NOP conversion there is no zero/sign extendi=
ng
    happening which is why it is ok to be done here; we were trying to prev=
ent
    an extra sign/zero extend from being moved away from definition which n=
o-op
    conversions are not.

    Bootstrapped and tested on x86_64-linux-gnu with no regressions.

    gcc/ChangeLog:

            PR tree-optimization/104376
            PR tree-optimization/101541
            * tree-ssa-phiopt.cc (factor_out_conditional_operation):
            Allow nop conversions even if it is defined by a statement
            inside the conditional.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/101541
            * gcc.dg/tree-ssa/phi-opt-39.c: New test.=