[Bug target/128512] New: [17 Regression] Huge compile time regression compiling povray with LTO

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128512

            Bug ID: 128512
           Summary: [17 Regression] Huge compile time regression compiling
                    povray with LTO
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog, lto
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
            Blocks: 26163
  Target Milestone: ---
            Target: aarch64-linux-gnu

>From https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=586.160.8
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=581.467.8
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=574.160.8
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=588.160.8 .

There is a huge (170%) increase between r17-5782-gcf6e20578339f8 and
r17-5837-g8835caacb1b5d9 while compiling povray with LTO on aarch64.


There is also a code size increase in the same time period too:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=574.151.4

Which might be related.


This happens for both spec cpu 2006 and 2017 versions too.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2026, 2k17, 2k and 2k6 and
95)