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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/68855] PAREN_EXPR not "ignored" where possible
Date: Fri, 21 Jun 2024 06:43:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D68855

--- Comment #11 from GCC 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:59221dc587f369695d9b0c2f73aedf8458931f0f

commit r15-1508-g59221dc587f369695d9b0c2f73aedf8458931f0f
Author: Andrew Pinski <quic_apinski@quicinc.com>
Date:   Thu Jun 20 15:52:05 2024 -0700

    complex-lowering: Better handling of PAREN_EXPR [PR68855]

    When PAREN_EXPR tree code was added in r0-85884-gdedd42d511b6e4,
    a simplified handling was added to complex lowering. Which means
    we would get:
    ```
      _9 =3D COMPLEX_EXPR <_15, _14>;
      _11 =3D ((_9));
      _19 =3D REALPART_EXPR <_11>;
      _20 =3D IMAGPART_EXPR <_11>;
    ```

    In many cases instead of just simply:
    ```
      _19 =3D ((_15));
      _20 =3D ((_14));
    ```

    So this adds full support for PAREN_EXPR to complex lowering.
    It is handled very similar as NEGATE_EXPR; except creating PAREN_EXPR
    instead of NEGATE_EXPR for the real/imag parts. This allows for
    more optimizations including vectorization, especially with
    -ffast-math.
    gfortran.dg/vect/pr68855.f90 is an example where this could show up.
    It also shows up in SPEC CPU 2006's 465.tonto; though I have not done
    any benchmarking there.

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

    gcc/ChangeLog:

            PR tree-optimization/68855
            * tree-complex.cc (init_dont_simulate_again): Handle PAREN_EXPR
            like NEGATE_EXPR.
            (complex_propagate::visit_stmt): Likewise.
            (expand_complex_move): Don't handle PAREN_EXPR.
            (expand_complex_paren): New function.
            (expand_complex_operations_1): Handle PAREN_EXPR like
            NEGATE_EXPR. And call expand_complex_paren for PAREN_EXPR.

    gcc/testsuite/ChangeLog:

            * gcc.dg/vect/pr68855.c: New test.
            * gfortran.dg/vect/pr68855.f90: New test.

    Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>=