https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121582
Bug ID: 121582
Summary: [16 Regression] ICE: in extract_insn, at recog.cc:2884
(unrecognizable insn) -mcpu=tt-ascalon-d8
-mrvv-vector-bits=zvl and vector __bf16
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: riscv64-unknown-linux-gnu
Created attachment 62139
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62139&action=edit
reduced testcase
Compiler output:
$ riscv64-unknown-linux-gnu-gcc -mcpu=tt-ascalon-d8 -mrvv-vector-bits=zvl
testcase.c
testcase.c: In function 'foo':
testcase.c:3:22: error: unrecognizable insn:
3 | void foo() { v -= w; }
| ^
(insn 83 82 84 2 (set (reg:RVVMF4BF 203)
(if_then_else:RVVMF4BF (unspec:RVVMF64BI [
(const_vector:RVVMF64BI [
(const_int 1 [0x1])
(const_int 0 [0]) repeated x3
])
(const_int 1 [0x1])
(const_int 0 [0])
(const_int 2 [0x2])
(const_int 0 [0])
(reg:SI 66 vl)
(reg:SI 67 vtype)
] UNSPEC_VPREDICATE)
(vec_duplicate:RVVMF4BF (reg:BF 139 [ _8 ]))
(reg:RVVMF4BF 203))) "testcase.c":3:16 -1
(nil))
during RTL pass: vregs
testcase.c:3:22: internal compiler error: in extract_insn, at recog.cc:2884
0x325e7f1 internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:534
0x101effb fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostics/context.cc:1687
0xc0986b _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.cc:108
0xc098e8 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/repo/gcc-trunk/gcc/rtl-error.cc:116
0xbfa6d8 extract_insn(rtx_insn*)
/repo/gcc-trunk/gcc/recog.cc:2884
0x13f017c instantiate_virtual_regs_in_insn
/repo/gcc-trunk/gcc/function.cc:1609
0x13f017c instantiate_virtual_regs
/repo/gcc-trunk/gcc/function.cc:1985
0x13f017c 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.
$ riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-riscv64/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20250817170447-r16-3246-g6f63044a7ae63a-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/16.0.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--with-isa-spec=2.2 --with-sysroot=/usr/riscv64-unknown-linux-gnu
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=riscv64-unknown-linux-gnu
--with-ld=/usr/bin/riscv64-unknown-linux-gnu-ld
--with-as=/usr/bin/riscv64-unknown-linux-gnu-as --disable-multilib
--enable-libsanitizer --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20250817170447-r16-3246-g6f63044a7ae63a-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20250817 (experimental) (GCC)
