https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123216
Bug ID: 123216
Summary: [16 Regression] ICE: in extract_insn, at recog.cc:2888
(unrecognizable insn) with -mavx10.2 -mno-avx512vl and
__builtin_ia32_cvttph2ibs128_mask()
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 63093
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63093&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -mavx10.2 -mno-avx512vl testcase.c
testcase.c: In function 'foo':
testcase.c:8:1: error: unrecognizable insn:
8 | }
| ^
(insn 7 6 10 2 (set (reg:V8HI 98 [ _1 ])
(vec_merge:V8HI (unspec:V8HI [
(reg:V8HF 100)
] UNSPEC_VCVTTPH2IBS)
(const_vector:V8HI [
(const_int 0 [0]) repeated x8
])
(reg:QI 101))) "testcase.c":7:10 -1
(nil))
during RTL pass: vregs
testcase.c:8:1: internal compiler error: in extract_insn, at recog.cc:2888
0x2c78bcd internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0xe2825f fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostics/context.cc:1805
0x88b8f2 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.cc:108
0x88b96f _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/repo/gcc-trunk/gcc/rtl-error.cc:116
0x87a3e3 extract_insn(rtx_insn*)
/repo/gcc-trunk/gcc/recog.cc:2888
0x11c5cfe instantiate_virtual_regs_in_insn
/repo/gcc-trunk/gcc/function.cc:1609
0x11c5cfe instantiate_virtual_regs
/repo/gcc-trunk/gcc/function.cc:1985
0x11c5cfe 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/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20251218144725-r16-6246-g630c1bfbb5bc3b-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-20251218144725-r16-6246-g630c1bfbb5bc3b-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20251218 (experimental) (GCC)
