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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: Wed, 19 Jan 2022 10:56:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104054

--- Comment #7 from Uro=C5=A1 Bizjak <ubizjak at gmail dot com> ---
For some reason the pass does not detect usage of Register si in (insn 55):

(debug_insn 55 54 56 6 (var_location:TI b (reg/v:TI 4 si [orig:86 b ] [86])=
) -1
     (nil))

Register ax (1):
Register dx (1):
Register cx (1):
Register si (1):
Register di (1): 55 [ALL_REGS]
Register r8 (1): 59 [GENERAL_REGS] 59 [GENERAL_REGS] 59 [GENERAL_REGS]
Register r9 (1):
Register r10 (1):=