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From: "msebor at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug gdb/29104] GDB very slow running LLVM opt
Date: Fri, 29 Apr 2022 22:38:44 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29104

--- Comment #7 from Martin Sebor <msebor at gmail dot com> ---
GDB trunk indeed solves the problem!  Thank you!

$ time ~/bin/gdb-trunk/bin/gdb --batch -nx -q -ex "r -S -instcombine x.ll"
/build/llvm-gcc/bin/opt

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.fedoraproject.org/>
Enable debuginfod for this session? (y or [n]) [answered N; input not from
terminal]
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbini=
t.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
; ModuleID =3D 'x.ll'
source_filename =3D "x.ll"

declare i64 @strlen(i8*)

define i64 @f(i8* %s) {
  %n =3D call i64 @strlen(i8* noundef nonnull dereferenceable(1) %s)
  ret i64 %n
}
[Inferior 1 (process 133664) exited normally]

real    0m1.440s
user    0m10.096s

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