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From: "sjames at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/114403] [14 regression] LLVM miscompiled with
 -O3 -march=znver2 -fno-vect-cost-model since r14-6822-g01f4251b8775c8
Date: Fri, 22 Mar 2024 13:12:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114403

--- Comment #10 from Sam James <sjames at gcc dot gnu.org> ---
Created attachment 57774
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57774&action=3Dedit
EarlyCSE.cpp.cpp.177t.ch_vect-bad

optimize("O2") on `template <typename InputIteratorT>
hash_code hash_combine_range_impl(InputIteratorT first, InputIteratorT last)
works,` but O3 is broken.

Unfortunately, novector pragmas don't work on the while()s in there. I get a
ignored warning.

Attached those dumps w/ -fdbg-cnt=3Dvect_loop:7 (so just the one bad loop).=
 I can
tarball up the 6 vs 7 if useful.

Thanks. Will try disabling those passes next..=