[Bug target/112561] New: [14 Regression] Segfault only on RISC-V vector

[patrick at rivosinc dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112561

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

GCC command:
./bin/riscv64-unknown-linux-gnu-gcc -march=rv64gcv -mabi=lp64d -ftree-vectorize
-O3 --param riscv-autovec-preference=fixed-vlmax ../testcase.c -o rv64gcv.out

QEMU v8.1.2 output:
> QEMU_CPU="rv64,vlen=128,v=true,vext_spec=v1.0,Zve32f=true,Zve64f=true" 
> /scratch/tc-testing/tc-nov-13-trunk/build-rv64gcv/bin/qemu-riscv64 rv64gcv.out
zsh: segmentation fault (core dumped) 
QEMU_CPU="rv64,vlen=128,v=true,vext_spec=v1.0,Zve32f=true,Zve64f=true"

Bisected to: r14-5151-g0c42741ad95