https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126686
Bug ID: 126686
Summary: ICE in require, at machmode.h:323 since r16-26
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: mjires at gcc dot gnu.org
CC: pinskia at gcc dot gnu.org
Target Milestone: ---
Compiling reduced testcase gcc.dg/torture/pr91656-3.c results in ICE since
r16-26-g2d693c1ffd849e.
$ cat pr91656-3.c
int tmp;
short d_e;
int foo() {
long f = 0;
__builtin_memset((char *)&f + sizeof f - 2, d_e, 2);
tmp = f;
return f;
}
$ s390x-linux-gnu-gcc pr91656-3.c -favoid-store-forwarding -O3
during RTL pass: avoid_store_forwarding
pr91656-3.c: In function ‘foo’:
pr91656-3.c:9:1: internal compiler error: in require, at machmode.h:323
9 | }
| ^
0x218566d internal_error(char const*, ...)
/home/mjires/git/GCC/master/gcc/diagnostic-global-context.cc:787
0x2190b63 fancy_abort(char const*, int, char const*)
/home/mjires/git/GCC/master/gcc/diagnostics/context.cc:1813
0xab52df opt_mode<scalar_int_mode>::require() const
/home/mjires/git/GCC/master/gcc/machmode.h:323
0xab52df store_integral_bit_field
/home/mjires/git/GCC/master/gcc/expmed.cc:1042
0xab52df store_bit_field_1
/home/mjires/git/GCC/master/gcc/expmed.cc:891
0xab567c store_bit_field(rtx_def*, poly_int<1u, unsigned long>, poly_int<1u,
unsigned long>, poly_int<1u, unsigned long>, poly_int<1u, unsigned long>,
machine_mode, rtx_def*, bool, bool)
/home/mjires/git/GCC/master/gcc/expmed.cc:1225
0xfc7123 generate_bit_insert_sequence
/home/mjires/git/GCC/master/gcc/avoid-store-forwarding.cc:132
0xfc7123 process_store_forwarding
/home/mjires/git/GCC/master/gcc/avoid-store-forwarding.cc:318
0xfc7123 avoid_store_forwarding
/home/mjires/git/GCC/master/gcc/avoid-store-forwarding.cc:707
0xfc7f32 execute
/home/mjires/git/GCC/master/gcc/avoid-store-forwarding.cc:764
/home/mjires/built/master-s390x-linux-gnu/libexec/gcc/s390x-linux-gnu/17.0.0/cc1
-quiet pr91656-3.c -quiet -dumpdir a- -dumpbase pr91656-3.c -dumpbase-ext .c
-march=z900 -O3 -favoid-store-forwarding -o /tmp/ccyCRFFE.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.
$ s390x-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=s390x-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/home/mjires/built/master-s390x-linux-gnu/libexec/gcc/s390x-linux-gnu/17.0.0/lto-wrapper
Target: s390x-linux-gnu
Configured with: /home/mjires/git/GCC/master/configure
--prefix=/home/mjires/built/master-s390x-linux-gnu --target=s390x-linux-gnu
--disable-bootstrap --enable-languages=c,c++,fortran --disable-multilib
--enable-checking : (reconfigured) /home/mjires/git/GCC/master/configure
--prefix=/home/mjires/built/master-s390x-linux-gnu --target=s390x-linux-gnu
--disable-bootstrap --disable-multilib --enable-checking
target_alias=s390x-linux-gnu --enable-languages=c,c++,fortran,lto --no-create
--no-recursion
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 17.0.0 20260806 (experimental) (GCC)
