https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127957
Bug ID: 127957
Summary: [17 Regression] ICE: in extract_insn, at recog.cc:2896
unrecognizable insn: float_extend:DF with
-mgeneral-regs-only -mf16c and
__builtin_nansf16("nan")
Product: gcc
Version: 17.0
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: i686-pc-linux-gnu
Created attachment 65878
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65878&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -mgeneral-regs-only -mf16c -m32 testcase.c
testcase.c: In function 'foo':
testcase.c:1:49: error: unrecognizable insn:
1 | double foo() { return __builtin_nansf16("nan"); }
| ^
(insn 14 13 17 2 (set (reg:DF 101 [ _2 ])
(float_extend:DF (reg:SF 103))) "testcase.c":1:23 discrim 1 -1
(expr_list:REG_EQUAL (float_extend:DF (reg:HF 100 [ _1 ]))
(nil)))
during RTL pass: vregs
testcase.c:1:49: internal compiler error: in extract_insn, at recog.cc:2896
0x2f76f69 internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0xd4a739 fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostics/context.cc:1813
0x8cbeee _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.cc:108
0x8cbf6b _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/repo/gcc-trunk/gcc/rtl-error.cc:116
0x8b8c98 extract_insn(rtx_insn*)
/repo/gcc-trunk/gcc/recog.cc:2896
0x11110de instantiate_virtual_regs_in_insn
/repo/gcc-trunk/gcc/function.cc:1690
0x11110de instantiate_virtual_regs
/repo/gcc-trunk/gcc/function.cc:2066
0x11110de execute
/repo/gcc-trunk/gcc/function.cc:2113
/repo/gcc-trunk/binary-trunk-20261016191828-g9d448830cc8-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/17.0.0/cc1
-quiet -imultilib 32 -iprefix
/repo/gcc-trunk/binary-trunk-20261016191828-g9d448830cc8-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../lib/gcc/x86_64-pc-linux-gnu/17.0.0/
testcase.c -quiet -dumpdir a- -dumpbase testcase.c -dumpbase-ext .c
-mgeneral-regs-only -mf16c -m32 -mtune=generic -march=x86-64 -o /tmp/cc0OctEf.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-20261016191828-g9d448830cc8-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/17.0.0/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-20261016191828-g9d448830cc8-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 17.0.0 20261016 (experimental) (GCC)
