https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117165
Bug ID: 117165
Summary: ICE: in extract_insn, at recog.c:2311 unrecognizable
insn: UNSPECV_FNSTSW with -mgeneral-regs-only and
__builtin_ia32_fnstsw()
Product: gcc
Version: 15.0
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 59358
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59358&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -mgeneral-regs-only testcase.c
testcase.c: In function 'foo':
testcase.c:5:1: error: unrecognizable insn:
5 | }
| ^
(insn 5 2 0 2 (set (reg:HI 98)
(unspec_volatile:HI [
(const_int 0 [0])
] UNSPECV_FNSTSW)) "testcase.c":4:3 -1
(nil))
during RTL pass: vregs
testcase.c:5:1: internal compiler error: in extract_insn, at recog.cc:2882
0x2d8abbe internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:517
0xe7ebb9 fancy_abort(char const*, int, char const*)
/repo/gcc-trunk/gcc/diagnostic.cc:1535
0x8318d1 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/repo/gcc-trunk/gcc/rtl-error.cc:108
0x83194e _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/repo/gcc-trunk/gcc/rtl-error.cc:116
0x8204b3 extract_insn(rtx_insn*)
/repo/gcc-trunk/gcc/recog.cc:2882
0x11f4a7e instantiate_virtual_regs_in_insn
/repo/gcc-trunk/gcc/function.cc:1612
0x11f4a7e instantiate_virtual_regs
/repo/gcc-trunk/gcc/function.cc:1995
0x11f4a7e execute
/repo/gcc-trunk/gcc/function.cc:2042
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-r15-4369-20241015204656-g50f27896adb-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/15.0.0/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
--with-cloog --with-ppl --with-isl --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-r15-4369-20241015204656-g50f27896adb-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.0 20241014 (experimental) (GCC)
