code: def ceil_log2(x):
      """Compute integer ceil log2 with a special code path for vulkan
      SPIR-V does not support log2 on fp64. Instead, we compute integer ceil_log2 via clz
      intrinsic when the target is vulkan.
  
      Parameters
      ----------
      x : tvm.te.Tensor
          Input argument.
  
      Returns
      -------
      y : tvm.te.Tensor
          The result.
      """
      if not isinstance(x, tvm.tir.PrimExpr):
          x = tvm.tir.const(x)
  
      if "float" in x.dtype:
          return tvm.tir.ceil(tvm.tir.log2(x))
  
      if "vulkan" in tvm.target.Target.current().kind.name:
          clz = tvm.tir.clz(x)
          bits = int(x.dtype[-2:])
          res = tvm.tir.if_then_else(
              x & (x - 1) == 0, bits - clz - 1, bits - clz
          )
  
          if res.dtype != x.dtype:
              return cast(res, x.dtype)
  
          return res
  
      if "adreno" in tvm.target.Target.current().device_name:
          return cast(
              tvm.tir.ceil(tvm.tir.log2(cast(x, "float32"))), x.dtype
          )
  
      return cast(
          tvm.tir.ceil(tvm.tir.log2(cast(x, "float64"))), x.dtype
      )
  
imports: import tvm
  from tvm import te
  from tvm.tir import PrimExpr
  from .None import tag
  from .None import cpp
  from .utils import get_const_tuple
label_desc: Use image node_id 43 for calling a global function with example usage: ceil_log2(x) and returns: cast, tvm, res, cast, cast