[mlir][tosa] Reorder ERF op to align with TOSA spec (#133814)

Minor non-functional change of the dialect to better align with the
operator order from the TOSA specification:
https://www.mlplatform.org/tosa/tosa_spec.html

Signed-off-by: Jerry Ge <jerry.ge@arm.com>

Author: Jerry-Ge

mlir/include/mlir/Dialect/Tosa/IR/TosaOps.td

@@ -499,21 +499,16 @@ def Tosa_ClampOp : Tosa_ElementwiseUnaryOp<"clamp"> {
 }
 
 //===----------------------------------------------------------------------===//
-// Operator: sigmoid
+// Operator: erf
 //===----------------------------------------------------------------------===//
-def Tosa_SigmoidOp : Tosa_ElementwiseUnaryOp<"sigmoid"> {
-  let summary = "Computes elementwise sigmoid of input.";
+def Tosa_ErfOp : Tosa_ElementwiseUnaryOp<"erf"> {
+  let summary = "Computes gauss error function of input.";
 
   let description = [{
-    Applies the sigmoid logistic function to each element of the input tensor:
-    $ sigmoid(x) = \frac{1}{1 + e^{-x}} $.
-
-    For quantized integer data types, the TABLE operator should be used instead.
-    Each implementation may choose an appropriate TABLE given the scale and zero
-    point of the input data. Eight or sixteen bit precision tables may be used
-    based on the input tensor to the sigmoid function. The sigmoid table has 513
-    entries each of 16-bit precision and covering the input range -16.0 to +16.0
-    in steps of 1/16.
+    Gauss error function: $ erf(x) = \frac{2}{\sqrt{\pi}} \int_{0}^{x} e^{-t^2} dt $
+    For quantized integer data types, the TABLE operator should be used instead
+    with the following definition. The ERF table has 513 entries each of
+    16-bit precision and covering the input range -4.0 to +4.0 in steps of 1/64.
   }];
 
   let arguments = (ins
@@ -528,21 +523,26 @@ def Tosa_SigmoidOp : Tosa_ElementwiseUnaryOp<"sigmoid"> {
     Profile<[Tosa_PRO_FP]>,
     Extension<[Tosa_EXT_BF16]>,
   ];
+
+  let assemblyFormat = "operands attr-dict `:` functional-type(operands, results)";
 }
 
 //===----------------------------------------------------------------------===//
-// Operator: tanh
+// Operator: sigmoid
 //===----------------------------------------------------------------------===//
-def Tosa_TanhOp : Tosa_ElementwiseUnaryOp<"tanh"> {
-  let summary = "Computes elementwise hyperbolic tangent of input.";
+def Tosa_SigmoidOp : Tosa_ElementwiseUnaryOp<"sigmoid"> {
+  let summary = "Computes elementwise sigmoid of input.";
 
   let description = [{
-    Parameterized hyperbolic tangent: $ tanh(x) = \frac{1 - e^{-2x}}{1 + e^{-2x}} $.
+    Applies the sigmoid logistic function to each element of the input tensor:
+    $ sigmoid(x) = \frac{1}{1 + e^{-x}} $.
 
     For quantized integer data types, the TABLE operator should be used instead.
     Each implementation may choose an appropriate TABLE given the scale and zero
     point of the input data. Eight or sixteen bit precision tables may be used
-    based on the input tensor to the tanh function.
+    based on the input tensor to the sigmoid function. The sigmoid table has 513
+    entries each of 16-bit precision and covering the input range -16.0 to +16.0
+    in steps of 1/16.
   }];
 
   let arguments = (ins
@@ -560,16 +560,18 @@ def Tosa_TanhOp : Tosa_ElementwiseUnaryOp<"tanh"> {
 }
 
 //===----------------------------------------------------------------------===//
-// Operator: erf
+// Operator: tanh
 //===----------------------------------------------------------------------===//
-def Tosa_ErfOp : Tosa_ElementwiseUnaryOp<"erf"> {
-  let summary = "Computes gauss error function of input.";
+def Tosa_TanhOp : Tosa_ElementwiseUnaryOp<"tanh"> {
+  let summary = "Computes elementwise hyperbolic tangent of input.";
 
   let description = [{
-    Gauss error function: $ erf(x) = \frac{2}{\sqrt{\pi}} \int_{0}^{x} e^{-t^2} dt $
-    For quantized integer data types, the TABLE operator should be used instead
-    with the following definition. The ERF table has 513 entries each of
-    16-bit precision and covering the input range -4.0 to +4.0 in steps of 1/64.
+    Parameterized hyperbolic tangent: $ tanh(x) = \frac{1 - e^{-2x}}{1 + e^{-2x}} $.
+
+    For quantized integer data types, the TABLE operator should be used instead.
+    Each implementation may choose an appropriate TABLE given the scale and zero
+    point of the input data. Eight or sixteen bit precision tables may be used
+    based on the input tensor to the tanh function.
   }];
 
   let arguments = (ins
@@ -584,8 +586,6 @@ def Tosa_ErfOp : Tosa_ElementwiseUnaryOp<"erf"> {
     Profile<[Tosa_PRO_FP]>,
     Extension<[Tosa_EXT_BF16]>,
   ];
-
-  let assemblyFormat = "operands attr-dict `:` functional-type(operands, results)";
 }
 
 //===----------------------------------------------------------------------===//