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From: "klaus.doldinger64 at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/109476] Missing optimization for 8bit/8bit
 multiplication / regression
Date: Thu, 13 Apr 2023 12:55:11 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 12.2.0
X-Bugzilla-Keywords: missed-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109476

--- Comment #11 from Wilhelm M <klaus.doldinger64 at googlemail dot com> ---
After testing some more code, I got this ICE:

/home/lmeier/Projekte/wmucpp/boards/rcfoc/gimbal_sbus_01.cc: In static memb=
er
function 'static void GlobalFsm<BusDevs>::ratePeriodic() [with BusDevs
=3DBusDevs<External::Bus::NoBus<Devices<0> > >]':
/home/lmeier/Projekte/wmucpp/boards/rcfoc/gimbal_sbus_01.cc:426:5: error:
unrecognizable insn:
426 |     }
|     ^
(insn 1584 1583 25 3 (set (concatn:HI [
(reg:QI 800)
(reg:QI 801 [+1 ])
])
(reg:HI 826)) "../../include0/external/sbus/sbus.h":226:69 -1
(nil))
during RTL pass: subreg1
/home/lmeier/Projekte/wmucpp/boards/rcfoc/gimbal_sbus_01.cc:426:5: internal
compiler error: in extract_insn, at recog.cc:2791
0x79f2cb _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../gcc/rtl-error.cc:108
0x79f2e7 _fatal_insn_not_found(rtx_def const*, char const*, int, char const=
*)
../../gcc/rtl-error.cc:116
0x79dc77 extract_insn(rtx_insn*)
../../gcc/recog.cc:2791
0x1a43d91 decompose_multiword_subregs
../../gcc/lower-subreg.cc:1651
0x1a447ca execute
../../gcc/lower-subreg.cc:1790
Please submit a full bug report, with preprocessed source (by using
-freport-bug).=