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Subject: [Bug tree-optimization/102128] [12 Regression] Huge performance drop
 for 519.lbm_r since r12-3116-g9216ee6d1195d48388f825cf1b072e570129cbbe
Date: Mon, 30 Aug 2021 12:04:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102128

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

https://gcc.gnu.org/g:89f33f44addbf9853bc3e6677db1fa941713cb6c

commit r12-3222-g89f33f44addbf9853bc3e6677db1fa941713cb6c
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Aug 30 12:56:26 2021 +0200

    tree-optimization/102128 - rework if-converted BB vect heuristic

    This reworks the previous attempt to avoid leaving around if-converted
    scalar code in BB vectorized loop bodies to keep costing independent
    subgraphs which should address the observed regression with 519.lbm_r.

    For this to work we now first cost all subgraphs and only after
    doing that proceed to emit vectorized code.

    2021-08-30  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/102128
            * tree-vect-slp.c (vect_bb_vectorization_profitable_p):
            Move scanning for if-converted scalar code to the caller
            and instead delay clearing the visited flag for profitable
            subgraphs.
            (vect_slp_region): Cost all subgraphs before scheduling.
            For if-converted BB vectorization scan for scalar COND_EXPRs
            and do not vectorize if any found and the cost model is
            very-cheap.=