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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/106746] [13 Regression] '-fcompare-debug' failure
 (length) with -O2 -fsched2-use-superblocks since r13-2041-g6624ad73064de241
Date: Thu, 01 Dec 2022 14:42:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106746

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #13)
> DEBUG_INSNs should never influence any scheduling decisions, or any other
> decisions that influence what machine code we generate.

Well, with the exception of scheduling decisions for the DEBUG_INSNs themse=
lves
(where exactly to place them).
haifa-sched.cc is full of various DEBUG_INSN related checks, in some cases
DEBUG_INSNs are ignored, in other places they are taken into account, ...
And in the end, most of the time it works fine for -fcompare-debug checks; =
it
doesn't for this testcase, so that needs to be understood why and fixed.=