[mlir][OpDSL] Remove unused SoftPlus2DOp operation.

[gysit]

Summary

The revision removes the SoftPlus2DOp operation that previously served as a test operation. It has been replaced by the elemwise_unary operation, which is now used to test unary log and exp functions.

mlir/include/mlir/Dialect/Linalg/IR/LinalgNamedStructuredOps.yaml

value: !ScalarExpression
                         kind: type
                         fn_name: cast_signed
                         type_var: F64
                         operands:
                         - !ScalarExpression
                           scalar_const: '2.3283063999999999E-10 : f64'
             - !ScalarExpression
               scalar_arg: min
---- !LinalgOpConfig
-metadata: !LinalgOpMetadata
-  name: soft_plus_2d
-  cpp_class_name: SoftPlus2DOp
-  doc: |-
-    Implements the soft plus operator.
-
-    Numeric casting is performed on the input operand, promoting it to the same
-    data type as the accumulator/output.
-structured_op: !LinalgStructuredOpConfig
-  args:
-  - !LinalgOperandDefConfig
-    name: I
-    kind: input_tensor
-    type_var: T
-    shape_map: affine_map<()[s0, s1] -> (s0, s1)>
-  - !LinalgOperandDefConfig
-    name: O
-    kind: output_tensor
-    type_var: U
-    shape_map: affine_map<()[s0, s1] -> (s0, s1)>
-  indexing_maps: !LinalgIndexingMapsConfig
-    static_indexing_maps:
-    - affine_map<(d0, d1)[s0, s1] -> (d0, d1)>
-    - affine_map<(d0, d1)[s0, s1] -> (d0, d1)>
-  iterator_types:
-  - parallel
-  - parallel
-  assignments:
-  - !ScalarAssign
-    arg: O
-    value: !ScalarExpression
-      scalar_fn:
-        kind: unary
-        fn_name: log
-        operands:
-        - !ScalarExpression
-          scalar_fn:
-            kind: binary
-            fn_name: add
-            operands:
-            - !ScalarExpression
-              scalar_fn:
-                kind: type
-                fn_name: cast_signed
-                type_var: U
-                operands:
-                - !ScalarExpression
-                  scalar_const: '1.000000e+00 : f64'
-            - !ScalarExpression
-              scalar_fn:
-                kind: unary
-                fn_name: exp
-                operands:
-                - !ScalarExpression
-                  scalar_fn:
-                    kind: type
-                    fn_name: cast_signed
-                    type_var: U
-                    operands:
-                    - !ScalarExpression
-                      scalar_arg: I

mlir/python/mlir/dialects/linalg/opdsl/ops/core_named_ops.py

def fill_rng_2d(
   increment = TypeFn.cast_signed(I32, const(12345))
   rand1 = (TypeFn.cast_signed(I32, index(D.m)) + seed) * multiplier + increment
   rand2 = (TypeFn.cast_signed(I32, index(D.n)) + rand1) * multiplier + increment
   inv_range = TypeFn.cast_signed(F64, const(2.3283064e-10))
   offset = TypeFn.cast_signed(F64, const(2147483647))
   scaling = (max - min) * inv_range
   O[D.m, D.n] = TypeFn.cast_signed(
       T, (offset + TypeFn.cast_signed(F64, rand2)) * scaling + min)
-
-
-@linalg_structured_op
-def soft_plus_2d(
-    I=TensorDef(T, S.M, S.N), O=TensorDef(U, S.M, S.N, output=True)):
-  """Implements the soft plus operator.
-
-  Numeric casting is performed on the input operand, promoting it to the same
-  data type as the accumulator/output.
-  """
-  domain(D.m, D.n)
-  O[D.m, D.n] = \
-      UnaryFn.log(TypeFn.cast_signed(U, const(1.0)) + UnaryFn.exp(TypeFn.cast_signed(U, I[D.m, D.n])))