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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/99510] [11 Regression] Compile time hog in
 build_aligned_type since r11-7123-g63538886d1f7fc7c
Date: Wed, 10 Mar 2021 10:13:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99510

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot =
gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.

 tree slp vectorization             :  32.83 ( 84%)   0.05 ( 20%)  32.90 ( =
83%)
   62M ( 24%)

I suspect it's latent before and caused by excessive vector size iteration.

I'll see what's the real cause here.=