https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96273
Bug ID: 96273
Summary: ice in extract_insn, at recog.c:2294, unrecognizable
insn:
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dcb314 at hotmail dot com
Target Milestone: ---
Created attachment 48911
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48911&action=edit
gzipped C++ source code
The attached C++ code does this with today's gcc trunk:
splat.cpp:1637:1: error: unrecognizable insn:
(insn 1137 1136 1138 163 (set (mem/v:BLK (scratch:DI) [0 A8])
(unspec:BLK [
(mem/v:BLK (scratch:DI) [0 A8])
] UNSPEC_MFENCE)) -1
(nil))
during RTL pass: vregs
splat.cpp:1637:1: internal compiler error: in extract_insn, at recog.c:2294
0xef8b46 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
../../trunk.git/gcc/rtl-error.c:108
0xef8b6b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
../../trunk.git/gcc/rtl-error.c:116
0xebf423 extract_insn(rtx_insn*)
../../trunk.git/gcc/recog.c:2294
Flags -O3 -march=native required. native is Piledriver. I'll
have a go at reducing the code.
This code used to work at date 20200719, so someone has broken
something in the last day or two.
