https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114172
Bug ID: 114172
Summary: ICE with riscv rvv VSETVL intrinsic
Product: gcc
Version: 13.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: vogelm at buerokommunikation dot fernuni-hagen.de
Target Milestone: ---
Created attachment 57576
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57576&action=edit
.i file generated from code in description
#pragma riscv intrinsic "vector"
void saxpy_rvv_m8(float *y, long vl)
{
for (;;)
{
vl = __riscv_vsetvl_e32m8(vl); //ICE
vfloat32m8_t y_vec;
__riscv_vse32_v_f32m8(y, y_vec, vl);
}
}
Description:
The attached code snipped causes an ICE on about 4 out of 10 attempts on my
local machine. It seems to be related to the RVV intrinsic call
__riscv_vsetvl_e32m8(vl) on line 7.
Passing vl as a parameter here is a programming error, but I don't think the
compiler should crash.
The behavior can also be observed on godbolt (https://godbolt.org/z/Gr915shzq).
I can reproduce the error on gcc 13.2.0 and 13.1.0.
gcc 14.0.1 doesn't crash so there already seems to be a fix for it but I
couldn't find any bug reports about it.
the exact version of GCC:
gcc version 13.2.0 (gc891d8dc23e)
the system type:
riscv64-unknown-linux-gnu
the options given when GCC was configured/built;
Configured with: $home/riscv-gnu-toolchain/gcc/configure
--target=riscv64-unknown-linux-gnu
--prefix=$home/riscv-gnu-toolchain/../_install
--with-sysroot=$home/riscv-gnu-toolchain/../_install/sysroot
--with-pkgversion=gc891d8dc23e
--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=rv64imafdcv
--with-tune=rocket
--with-isa-spec=20191213 'CFLAGS_FOR_TARGET=-O2 -mcmodel=medlow'
'CXXFLAGS_FOR_TARGET=-O2 -mcmodel=medlow'
the complete command line that triggers the bug;
riscv64-unknown-linux-gnu-gcc -march=rv64imafdcv -mabi=lp64d -O3 -static -c
saxpy.c -o saxpy
the compiler output (error messages, warnings, etc.)
riscv64-unknown-linux-gnu-gcc: internal compiler error: Segmentation fault
signal terminated program cc1
