https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124407
Bug ID: 124407
Summary: [16 Regression] during RTL pass: ira ICE: in
extract_insn, at recog.cc:2892 (unrecognizable insn)
(set (reg:SF 126) (const_int 0 [0])) with -Ofast
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 63851
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63851&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -Ofast testcase.c
testcase.c: In function 'foo':
testcase.c:12:1: error: unrecognizable insn:
12 | }
| ^
(insn 36 8 35 2 (set (reg:SF 126)
(const_int 0 [0])) -1
(expr_list:REG_EQUIV (const_int 0 [0])
(nil)))
during RTL pass: ira
testcase.c:12:1: internal compiler error: in extract_insn, at recog.cc:2892
0x2ca62bd internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0xe2e52f fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostics/context.cc:1813
0x891b76 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.cc:108
0x891bf3 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/repo/gcc-trunk/gcc/rtl-error.cc:116
0x880667 extract_insn(rtx_insn*)
/repo/gcc-trunk/gcc/recog.cc:2892
0x13ae6b1 ira_remove_insn_scratches(rtx_insn*, bool, _IO_FILE*, rtx_def*
(*)(rtx_def*))
/repo/gcc-trunk/gcc/ira.cc:5460
0x13b149d remove_scratches
/repo/gcc-trunk/gcc/ira.cc:5504
0x13b149d ira
/repo/gcc-trunk/gcc/ira.cc:5860
0x13b149d execute
/repo/gcc-trunk/gcc/ira.cc:6220
/repo/gcc-trunk/binary-trunk-20260308011627-r16-7949-g6c5de6335f5da0-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.1/cc1
-quiet -iprefix
/repo/gcc-trunk/binary-trunk-20260308011627-r16-7949-g6c5de6335f5da0-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../lib/gcc/x86_64-pc-linux-gnu/16.0.1/
testcase.c -quiet -dumpdir a- -dumpbase testcase.c -dumpbase-ext .c
-mtune=generic -march=x86-64 -Ofast -o /tmp/cc9fKmDf.s
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20260308011627-r16-7949-g6c5de6335f5da0-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20260308011627-r16-7949-g6c5de6335f5da0-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.1 20260308 (experimental) (GCC)
