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From: "vogelm at buerokommunikation dot fernuni-hagen.de"
 <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114172] New: ICE with riscv rvv VSETVL intrinsic
Date: Thu, 29 Feb 2024 15:55:25 +0000
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X-Bugzilla-Version: 13.2.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114172

            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=3D57576&action=3Dedit
.i file generated from code in description

#pragma riscv intrinsic "vector"

void saxpy_rvv_m8(float *y, long vl)
{
    for (;;)
    {
        vl =3D __riscv_vsetvl_e32m8(vl); //ICE
        vfloat32m8_t y_vec;
        __riscv_vse32_v_f32m8(y, y_vec, vl);
    }
}

Description:=20
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.=20
The behavior can also be observed on godbolt (https://godbolt.org/z/Gr915sh=
zq).
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)=20

the system type:
    riscv64-unknown-linux-gnu

the options given when GCC was configured/built;
    Configured with: $home/riscv-gnu-toolchain/gcc/configure=20
        --target=3Driscv64-unknown-linux-gnu=20
        --prefix=3D$home/riscv-gnu-toolchain/../_install=20
        --with-sysroot=3D$home/riscv-gnu-toolchain/../_install/sysroot=20
        --with-pkgversion=3Dgc891d8dc23e=20
        --with-system-zlib=20
        --enable-shared=20
        --enable-tls=20
        --enable-languages=3Dc,c++,fortran=20
        --disable-libmudflap=20
        --disable-libssp=20
        --disable-libquadmath=20
        --disable-libsanitizer=20
        --disable-nls=20
        --disable-bootstrap=20
        --src=3D.././gcc=20
        --enable-multilib=20
        --with-abi=3Dlp64d=20
        --with-arch=3Drv64imafdcv=20
        --with-tune=3Drocket=20
        --with-isa-spec=3D20191213 'CFLAGS_FOR_TARGET=3D-O2    -mcmodel=3Dm=
edlow'
'CXXFLAGS_FOR_TARGET=3D-O2    -mcmodel=3Dmedlow'

the complete command line that triggers the bug;
    riscv64-unknown-linux-gnu-gcc -march=3Drv64imafdcv -mabi=3Dlp64d -O3 -s=
tatic -c
saxpy.c -o saxpy

the compiler output (error messages, warnings, etc.)
    riscv64-unknown-linux-gnu-gcc: internal compiler error: Segmentation fa=
ult
signal terminated program cc1=