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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/110490] tree-ssa/clz-* and tree-ssa/ctz-*
 fail on s390x with arch14 (expression_expensive_p not handling if there is
 wider clz/ctz/popcount optab)
Date: Tue, 07 May 2024 12:13:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110490

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Stefan Schulze Frielinghaus
<stefansf@gcc.gnu.org>:

https://gcc.gnu.org/g:e1f56c67a82172730c377a96a46e8d75445e6a48

commit r15-274-ge1f56c67a82172730c377a96a46e8d75445e6a48
Author: Stefan Schulze Frielinghaus <stefansf@linux.ibm.com>
Date:   Tue May 7 14:12:55 2024 +0200

    tree-optimization/110490 - bitcount for narrow modes

    Bitcount operations popcount, clz, and ctz are emulated for narrow modes
    in case an operation is only supported for wider modes.  Beside that ctz
    may be emulated via clz in expand_ctz.  Reflect this in
    expression_expensive_p.

    I considered the emulation of ctz via clz as not expensive since this
    basically reduces to ctz (x) =3D c - (clz (x & ~x)) where c is the mode
    precision minus 1 which should be faster than a loop.

    gcc/ChangeLog:

            PR tree-optimization/110490
            * tree-scalar-evolution.cc (expression_expensive_p): Also
            consider mode widening for popcount, clz, and ctz.=