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From: "arsen at aarsen dot me" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/108250] [12/13 regression] llvm-tblgen miscompiled on
 powerpc-unknown-linux-gnu since r12-5383-g22c242342e38eb
Date: Thu, 29 Dec 2022 16:54:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108250

--- Comment #7 from Arsen Arsenovi=C4=87 <arsen at aarsen dot me> ---
Created attachment 54165
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54165&action=3Dedit
hang-testing script

With the attached script, I singled out
utils/TableGen/CMakeFiles/llvm-tblgen.dir/CodeGenDAGPatterns.cpp.o.  For
context, bisect-maybe-broken-2022-12-28-hangs is a build directory that
contains files built with the "bad" gcc version (in this instance, GCC: (Ge=
ntoo
12.2.1, commit a3fbfc1027e9edcd14bb290b5702504d80d9e8fe) 12.2.1 20221227),
which causes tblgen to run for longer than one minute and then get timed out
(whereas it normally exits within five seconds).

I also find it quite odd that -fdump-ipa-all didn't cause the build to
reproduce before the revert.  I can definitely see a bunch of IPA-pass dump
files in the build directory=