code: def opaque_access_func() -> None:
      A = T.alloc_buffer([1024])
      B = T.alloc_buffer([1024])
      for i in T.serial(0, 8):
          with T.block():
              v = T.axis.S(8, i)
              T.reads([A[v * 128 : v * 128 + 128]])
              T.writes([B[v * 128 : v * 128 + 128]])
              T.evaluate(
                  T.call_extern(
                      "test",
                      B.data,
                      v * 128,
                      128,
                      A.data,
                      v * 128,
                      128,
                      dtype="float32",
                  )
              )
  
imports: import pytest
  import tvm
  from tvm import tir
  from tvm.script import tir
  from tvm.ir import Range
label_desc: Use image node_id 4 for calling a global function with example usage: opaque_access_func() without return types