https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121658
Bug ID: 121658
Summary: [16 Regression] ICE: in extract_insn, at recog.cc:2884
(unrecognizable insn) with -O -mavx512f -mgfni
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
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 62187
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62187&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -O -mavx512f -mgfni testcase.c
testcase.c: In function 'foo':
testcase.c:2:39: error: unrecognizable insn:
2 | void foo() { v = (v << 7) | (v >> 1); }
| ^
(insn 6 5 7 2 (set (reg:V64QI 100 [ _2 ])
(unspec:V64QI [
(mem/c:V64QI (symbol_ref:DI ("v") [flags 0x2] <var_decl
0x7f9737e4fe40 v>) [0 v+0 S64 A512])
(reg:V64QI 101)
(const_int 0 [0])
] UNSPEC_GF2P8AFFINE)) "testcase.c":2:27 -1
(expr_list:REG_EQUAL (rotatert:V64QI (mem/c:V64QI (symbol_ref:DI ("v")
[flags 0x2] <var_decl 0x7f9737e4fe40 v>) [0 v+0 S64 A512])
(const_int 1 [0x1]))
(nil)))
during RTL pass: vregs
testcase.c:2:39: internal compiler error: in extract_insn, at recog.cc:2884
0x2b95151 internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:534
0xe0c757 fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostics/context.cc:1687
0x88029d _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.cc:108
0x88031a _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/repo/gcc-trunk/gcc/rtl-error.cc:116
0x86eeca extract_insn(rtx_insn*)
/repo/gcc-trunk/gcc/recog.cc:2884
0x119534f instantiate_virtual_regs_in_insn
/repo/gcc-trunk/gcc/function.cc:1609
0x119534f instantiate_virtual_regs
/repo/gcc-trunk/gcc/function.cc:1985
0x119534f execute
/repo/gcc-trunk/gcc/function.cc:2032
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-20250825110703-r16-3365-gd914cb6743d887-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.0/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-20250825110703-r16-3365-gd914cb6743d887-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250825 (experimental) (GCC)
