https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112971
Bug ID: 112971
Summary: [14] RISC-V rv64gcv_zvl256b vector -O3: internal
compiler error: Segmentation fault signal terminated
program cc1
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick at rivosinc dot com
Target Milestone: ---
> /scratch/tc-testing/tc-dec-11-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
> -march=rv64gcv_zvl256b -mabi=lp64d -O3 red.c -S
riscv64-unknown-linux-gnu-gcc: internal compiler error: Segmentation fault
signal terminated program cc1
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
Testcase:
int a;
short b[9];
char c, d;
void e() {
d = 0;
for (;; d++) {
if (b[d])
break;
a = 8;
for (; a >= 0; a--) {
char *f = &c;
*f &= d == (a & d);
}
}
}
-freport bug doesn't seem to be working, so here's the GCC -v output:
> /scratch/tc-testing/tc-dec-11-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
> -v
Using built-in specs.
COLLECT_GCC=/scratch/tc-testing/tc-dec-11-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/scratch/tc-testing/tc-dec-11-trunk/build-rv64gcv/libexec/gcc/riscv64-unknown-linux-gnu/14.0.0/lto-wrapper
Target: riscv64-unknown-linux-gnu
Configured with:
/scratch/tc-testing/tc-dec-11-trunk/build-rv64gcv/../gcc/configure
--target=riscv64-unknown-linux-gnu
--prefix=/scratch/tc-testing/tc-dec-11-trunk/build-rv64gcv
--with-sysroot=/scratch/tc-testing/tc-dec-11-trunk/build-rv64gcv/sysroot
--with-pkgversion=geea25179d8d --with-system-zlib --enable-shared --enable-tls
--enable-languages=c,c++,fortran --disable-libmudflap --disable-libssp
--disable-libquadmath --disable-libsanitizer --disable-nls --disable-bootstrap
--src=../../gcc --enable-multilib --with-abi=lp64d --with-arch=rv64imafdc
--with-tune=rocket --with-isa-spec=20191213 'CFLAGS_FOR_TARGET=-O2
-mcmodel=medlow' 'CXXFLAGS_FOR_TARGET=-O2 -mcmodel=medlow'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231211 (experimental) (geea25179d8d)
The issue goes away if I use --param=riscv-autovec-preference=fixed-vlmax.
Godbolt: https://godbolt.org/z/4ovbT6d77
