gcc/testsuite/gcc.target/riscv/zero-extend-2.c

/* { dg-do compile { target { riscv64*-*-* } } } */
/* { dg-options "-march=rv64gc -mabi=lp64 -O2" } */
void
sub (unsigned int wc, unsigned long step, unsigned char *start)
{
  do
    {
      start[--step] = wc;
      wc >>= 6;
    }
  while (step > 1);
}
/* { dg-final { scan-assembler-times "sext.w" 0 } } */