https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107127
Bug ID: 107127
Summary: [Regression 11/12] Long compile times on code with C
complex
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: inform at tiker dot net
Target Milestone: ---
A generated code using C-style complex arithmetic that compiled nearly
instantaneously with gcc 10.4 takes >=30s with gcc 11.3.0 and 12.2.0.
How to reproduce:
git clone https://gist.github.com/inducer/802e227e86e3ff4fd95aa0fefae462fe.git
cd 802e227e86e3ff4fd95aa0fefae462fe
git checkout 9eb600e
$ time gcc-10 -c post-110.c
gcc-10 -c post-110.c 0,05s user 0,02s system 45% cpu 0,155 total
$ time gcc-11 -c post-110.c
^C
gcc-11 -c post-110.c 0,00s user 0,00s system 0% cpu 23,757 total
$ time gcc-12 -c post-110.c
^C
gcc-12 -c post-110.c 0,00s user 0,00s system 0% cpu 31,574 total
This does not seem to be very sensitive to headers, so I'm not including
preprocessed source to start. Happy to supply it if needed.
Target: x86_64-linux-gnu
Precise versions:
gcc version 10.4.0 (Debian 10.4.0-5)
gcc version 11.3.0 (Debian 11.3.0-5)
gcc version 12.2.0 (Debian 12.2.0-3)
x-ref: https://github.com/inducer/loopy/issues/686
