code: def test_atomic_cas(self, dtype):
      if dtype == cupy.uint16:
          if (
              runtime.is_hip
              or runtime.runtimeGetVersion() < 10010
              or int(device.get_compute_capability()) < 70
          ):
              self.skipTest("not supported")
  
      @jit.rawkernel()
      def f(x, y, out):
          tid = jit.blockDim.x * jit.blockIdx.x + jit.threadIdx.x
          if tid < x.size:
              # = y[tid] if out[tid] == x[tid] else out[tid]
              jit.atomic_cas(out, tid, x[tid], y[tid])
  
      x = cupy.arange(1024, dtype=dtype)
      y = x.copy()
      y[512:] = 0
      out = x.copy()
      out[:512] = 0
      f((32,), (32,), (x, y, out))
      expected = cupy.zeros_like(out)
      self._check(out, expected)
  
imports: import numpy
  import pytest
  import cupy
  from cupyx import jit
  from cupy import testing
  from cupy.cuda import device
  from cupy.cuda import runtime
label_desc: Use image node_id 34 for calling the TestRaw obj's underlying member method code with example usage: obj.test_atomic_cas(dtype) without return types