[Bug target/113281] New: [14] RISC-V rv64gcv_zvl256b vector: Runtime mismatch with rv64gc

[patrick at rivosinc dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113281

            Bug ID: 113281
           Summary: [14] RISC-V rv64gcv_zvl256b vector: Runtime mismatch
                    with rv64gc
           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: ---

Testcase:
unsigned char a;

int main() {
  short b = a = 0;
  for (; a != 19; a++)
    if (a)
      b = 32872 >> a;

  if (b == 0)
    return 0;
  else
    return 1;
}

Commands:
rv64gcv_zvl256b:
> /scratch/tc-testing/tc-jan-8-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
>  -march=rv64gcv_zvl256b -O3 red.c -o user-config.out
> QEMU_CPU=rv64,vlen=256,v=true,vext_spec=v1.0,Zve32f=true,Zve64f=true timeout 
> --verbose -k 0.1 1 
> /scratch/tc-testing/tc-jan-8-trunk/build-rv64gcv/bin/qemu-riscv64 
> user-config.out
> echo $?
1

rv64gc:
> /scratch/tc-testing/tc-jan-8-trunk/build-rv64gcv/bin/riscv64-unknown-linux-gnu-gcc
>  -march=rv64gc -O3 red.c -o rv64gc.out
> QEMU_CPU=rv64,vlen=256,v=true,vext_spec=v1.0,Zve32f=true,Zve64f=true timeout 
> --verbose -k 0.1 1 
> /scratch/tc-testing/tc-jan-8-trunk/build-rv64gcv/bin/qemu-riscv64 rv64gc.out
> echo $?
0