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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/111619] [14 regression] 'make
 profiledbootstrap' makes 10+ minutes on insn-recog.cc (x86_64-linux)
Date: Thu, 28 Sep 2023 06:48:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111619

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-*-*
   Target Milestone|---                         |14.0

--- Comment #10 from Richard Biener <rguenth at gcc dot gnu.org> ---
 PRE                                : 444.33 ( 55%)   0.19 (  4%) 444.86 ( =
54%)
  216k (  0%)

There's a few other bugs about RTL PRE being slow (it's usually the dataflow
parts implemented with big sbitmaps and expression hashes).  I've tried a
few times to get my hands into that but it's somewhat difficult.

For profile-generate we have a lot more memory ops which is what likely
kills us here (lots of bitmap iteration with disabled inlining/optimization=
).

Is this really a regression in GCC 14?

Note we are already using -fno-checking for building stage2.=