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From: "hp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/113175] New: [14 Regression] MMIX:
 testsuite/std/ranges/iota/max_size_type.cc 5x times slower
Date: Sat, 30 Dec 2023 00:36:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113175

            Bug ID: 113175
           Summary: [14 Regression] MMIX:
                    testsuite/std/ranges/iota/max_size_type.cc 5x times
                    slower
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hp at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: mmix-knuth-mmixware

(Perhaps a "[13 Regression]" as well - haven't checked.)

I ran the testsuite for mmix-knuth-mmixware (a 64-bit newlib cross) and fou=
nd
that testsuite/std/ranges/iota/max_size_type.cc times out, despite the
timeout-factor increased by a factor 4 (from 360 seconds to 1440 seconds) in
r12-2799-ge9b639c4b53221.

For a tree at r12-2797-g307e0d40367996 running this test takes 11:43.61 (mm=
:ss)
wall-clock time and now at r14-6859-gd1eacedc6d9b it takes 58:45.78 (on one=
 and
the same host and same session within the same hour; no host-side changes a=
nd
the test itself apparently hasn't changed significantly).

I haven't checked whether this affects other targets, but if so, a 5x
performance regression should have been picked up by other testers, thus I'm
starting with "target" until firther investigated.=