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From: "patrick at rivosinc dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/112561] New: [14 Regression] Segfault only on RISC-V
 vector
Date: Thu, 16 Nov 2023 08:06:36 +0000
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X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112561

            Bug ID: 112561
           Summary: [14 Regression] Segfault only on RISC-V vector
           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: ---

This testcase used to run successfully on rv64gcv but now fails with a
segmentation fault:

Testcase:
int printf(char *, ...);
int a, b, c, e;
short d[7][7] =3D {};
void main() {
  short f;
  c =3D 0;
  for (; c <=3D 6; c++) {
    e |=3D d[c][c] & 1;
    b &=3D f & 3;
  }
  printf("%X\n", a);
}

GCC command:
./bin/riscv64-unknown-linux-gnu-gcc -march=3Drv64gcv -mabi=3Dlp64d -ftree-v=
ectorize
-O3 --param riscv-autovec-preference=3Dfixed-vlmax ../testcase.c -o rv64gcv=
.out

QEMU v8.1.2 output:
> QEMU_CPU=3D"rv64,vlen=3D128,v=3Dtrue,vext_spec=3Dv1.0,Zve32f=3Dtrue,Zve64=
f=3Dtrue" /scratch/tc-testing/tc-nov-13-trunk/build-rv64gcv/bin/qemu-riscv6=
4 rv64gcv.out
zsh: segmentation fault (core dumped)=20
QEMU_CPU=3D"rv64,vlen=3D128,v=3Dtrue,vext_spec=3Dv1.0,Zve32f=3Dtrue,Zve64f=
=3Dtrue"

Bisected to: r14-5151-g0c42741ad95=