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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/104054] [9/10/11/12 Regression]
 '-fcompare-debug' failure (length) w/ -Os -funroll-loops since
 r8-3946-gfe94440235cfaa57
Date: Mon, 17 Jan 2022 12:38:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104054

--- Comment #5 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
Could be a red herring, but in _.rnreg dump:

Register r9 (1): 75 [GENERAL_REGS] 18 [ALL_REGS] 97 [GENERAL_REGS]
Register r10 (1): 76 [GENERAL_REGS] 18 [ALL_REGS] 23 [GENERAL_REGS]
...
Register di (1): 55 [ALL_REGS]

the pass w/ -g also records hard registers in debug insns. Probably this dr=
ives
some decisions to make different choices with respect to register renaming.=