[Bug target/113607] New: [14] RISC-V rv64gcv vector: Runtime mismatch at -O3

[patrick at rivosinc dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113607

            Bug ID: 113607
           Summary: [14] RISC-V rv64gcv vector: Runtime mismatch at -O3
           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: ---

Tested using r14-8438-g136a828754f

Testcase:
struct {
  signed b;
} c, d = {6};
short e, f;
int g[1000];
signed char h;
int i, j;
long k, l;

long m(long n, long o) {
  if (n < 1 && o == 0)
    return 0;
  return n;
}

static int p() {
  long q = 0;
  int a = 0;
  for (; e < 2; e += 1)
    g[e * 7 + 1] = 2637287069;
  for (; h <= 6; h += 1) {
    k = g[8] || f;
    l = m(g[f * 7 + 1], k);
    a = l;
    j = a < 0 || g[f * 7 + 1] < 0 || g[f * 7 + 1] >= 32 ? a : a << g[f * 7 +
1];
    if (j)
      ++q;
  }
  if (q)
    c = d;
  return i;
}

int main() {
  p();
  if (c.b == 0)
    return 0;
  else
    return 1;
}

Commands:
> /scratch/tc-testing/tc-jan-25-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
>  -O3 -march=rv64gcv red.c -o user-config-o3.out
> QEMU_CPU=rv64,vlen=128,v=true,vext_spec=v1.0,Zve32f=true,Zve64f=true 
> /scratch/tc-testing/tc-jan-25-trunk/build-rv64gcv/bin/qemu-riscv64 
> user-config-o3.out
> echo $?
1

> /scratch/tc-testing/tc-jan-25-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
>  -O2 -march=rv64gcv red.c -o user-config-o2.out
> QEMU_CPU=rv64,vlen=128,v=true,vext_spec=v1.0,Zve32f=true,Zve64f=true 
> /scratch/tc-testing/tc-jan-25-trunk/build-rv64gcv/bin/qemu-riscv64 
> user-config-o2.out
> echo $?
0

Found using fuzzer.