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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108738] compile-time and memory-hog in mdreorg
Date: Thu, 09 Feb 2023 08:47:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108738

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

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

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
A perf report isn't very conclusive, but at least points at STV:

Samples: 3M of event 'cycles:u', Event count (approx.): 4455606089800=20=20=
=20=20=20=20=20=20=20=20=20
     Samples  Command  Shared Object       Symbol=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
     2153935  cc1      cc1                 [.] bitmap_bit_p=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
      288315  cc1      cc1                 [.] (anonymous
namespace)::scalar_chain::analyze_register_chain
      145980  cc1      cc1                 [.] bitmap_equal_p=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
       85953  cc1      cc1                 [.] pop_scope=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
       70985  cc1      cc1                 [.] bitmap_ior_into=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20
       87675  cc1      cc1                 [.] df_chain_create

with -O2 -mno-stv we get to

 machine dep reorg                  :   0.01 (  0%)   0.00 (  0%)   0.01 ( =
 0%)
    0  (  0%)
 TOTAL                              : 202.90          8.46        211.41=20=
=20=20=20=20=20=20
 1475M=