[Bug debug/106746] [13 Regression] '-fcompare-debug' failure (length) with -O2 -fsched2-use-superblocks since r13-2041-g6624ad73064de241
hjl.tools at gmail dot com
gcc-bugzilla@gcc.gnu.org
Fri Sep 2 17:09:05 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106746
--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Roger Sayle from comment #9)
> I'm curious why the zero_extend behaves so differently to a sign_extend,
> perhaps a missing simplification or pattern. Presumably the CONCAT in the
> debug_insn is there whether or not a sign_extend or zero_extend is used?
I think instruction order changes at random when there are debug insns
with CONCAT and CONCATN.
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