https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123910
Bug ID: 123910
Summary: ICE: in extract_insn, at recog.cc:2888: unrecognizable
insn: if_then_else:RVVMF2QI... UNSPEC_VUNDEF with
-mcpu=xt-c920 -mrvv-vector-bits=zvl
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 63545
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63545&action=edit
reduced testcase
Compiler output:
$ riscv64-unknown-linux-gnu-gcc -mcpu=xt-c920 -mrvv-vector-bits=zvl testcase.c
testcase.c: In function 'foo':
testcase.c:8:1: error: unrecognizable insn:
8 | }
| ^
(insn 12 11 13 2 (set (reg:RVVMF2QI 139)
(if_then_else:RVVMF2QI (unspec:RVVMF16BI [
(const_vector:RVVMF16BI [
(const_int 1 [0x1]) repeated x8
])
(reg:DI 140)
(const_int 1 [0x1]) repeated x3
(reg:SI 66 vl)
(reg:SI 67 vtype)
] UNSPEC_VPREDICATE)
(vec_duplicate:RVVMF2QI (reg:QI 141))
(unspec:RVVMF2QI [
(reg:DI 0 zero)
] UNSPEC_VUNDEF))) "testcase.c":7:3 -1
(nil))
during RTL pass: vregs
testcase.c:8:1: internal compiler error: in extract_insn, at recog.cc:2888
0x36943bd internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0x11487c7 fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostics/context.cc:1812
0xcde829 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.cc:108
0xcde8a6 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/repo/gcc-trunk/gcc/rtl-error.cc:116
0xccf5af extract_insn(rtx_insn*)
/repo/gcc-trunk/gcc/recog.cc:2888
0x153312b instantiate_virtual_regs_in_insn
/repo/gcc-trunk/gcc/function.cc:1609
0x153312b instantiate_virtual_regs
/repo/gcc-trunk/gcc/function.cc:1985
0x153312b execute
/repo/gcc-trunk/gcc/function.cc:2032
/repo/gcc-trunk/binary-trunk-20260201021027-r16-7220-gff7d7898bb40d4-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/16.0.1/cc1
-quiet -imultilib . -iprefix
/repo/gcc-trunk/binary-trunk-20260201021027-r16-7220-gff7d7898bb40d4-checking-yes-rtl-df-extra-riscv64/bin/../lib/gcc/riscv64-unknown-linux-gnu/16.0.1/
testcase.c -quiet -dumpdir a- -dumpbase testcase.c -dumpbase-ext .c
-mcpu=xt-c920 -mrvv-vector-bits=zvl
-march=rv64imafdc_zicntr_zihpm_zmmul_zaamo_zalrsc_zfh_zfhmin_zca_zcd_xtheadba_xtheadbb_xtheadbs_xtheadcmo_xtheadcondmov_xtheadfmemidx_xtheadmac_xtheadmemidx_xtheadmempair_xtheadsync_xtheadvector
-mabi=lp64d -misa-spec=2.2 -mtls-dialect=trad
-march=rv64imafdc_zicntr_zihpm_zmmul_zaamo_zalrsc_zfh_zfhmin_zca_zcd_xtheadba_xtheadbb_xtheadbs_xtheadcmo_xtheadcondmov_xtheadfmemidx_xtheadmac_xtheadmemidx_xtheadmempair_xtheadsync_xtheadvector
-o /tmp/ccnD4wTK.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.
$ 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-20260201021027-r16-7220-gff7d7898bb40d4-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-unknown-linux-gnu/16.0.1/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
--enable-libsanitizer --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
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20260201021027-r16-7220-gff7d7898bb40d4-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.1 20260201 (experimental) (GCC)
