Remove fp16 tan implementation

numba/cuda/cudamath.py

@@ -24,6 +24,7 @@
 @infer_global(math.radians)
 @infer_global(math.sinh)
 @infer_global(math.tanh)
+@infer_global(math.tan)
 class Math_unary(ConcreteTemplate):
     cases = [
         signature(types.float64, types.int64),
@@ -35,7 +36,6 @@ class Math_unary(ConcreteTemplate):
 
 @infer_global(math.sin)
 @infer_global(math.cos)
-@infer_global(math.tan)
 @infer_global(math.ceil)
 @infer_global(math.floor)
 @infer_global(math.sqrt)

numba/cuda/mathimpl.py

@@ -106,14 +106,6 @@ def fp16_cos(x):
     return context.compile_internal(builder, fp16_cos, sig, args)
 
 
-@lower(math.tan, types.float16)
-def fp16_tan_impl(context, builder, sig, args):
-    def fp16_tan(x):
-        return cuda.fp16.hdiv(cuda.fp16.hsin(x), cuda.fp16.hcos(x))
-
-    return context.compile_internal(builder, fp16_tan, sig, args)
-
-
 @lower(math.log, types.float16)
 def fp16_log_impl(context, builder, sig, args):
     def fp16_log(x):

numba/cuda/tests/cudapy/test_math.py

@@ -388,7 +388,6 @@ def test_math_cos(self):
     def test_math_fp16(self):
         self.unary_template_float16(math_sin, np.sin)
         self.unary_template_float16(math_cos, np.cos)
-        self.unary_template_float16(math_tan, np.tan)
         self.unary_template_float16(math_exp, np.exp)
         self.unary_template_float16(math_log, np.log, start=1)
         self.unary_template_float16(math_log2, np.log2, start=1)