[MLIR][Standard] Add log1p operation to std

[pifon2a]

mlir/include/mlir/Dialect/StandardOps/IR/Ops.td

1958

nit: base-e logarithm of one plus the given value,

just to be consistent with everything above.

[frgossen]

Address comments

[frgossen]

Thanks

[mehdi_amini]

Since the split of the standard dialect has begun, can you create a math dialect and move this kind of operations there?

[herhut]

In D95041#2510841, @mehdi_amini wrote:

Since the split of the standard dialect has begun, can you create a math dialect and move this kind of operations there?

See https://llvm.discourse.group/t/rfc-split-the-math-dialect-from-std/2620.

[frgossen]

This comment was removed by frgossen.

mlir/include/mlir/Dialect/StandardOps/IR/Ops.td

 //===----------------------------------------------------------------------===//
 // LogOp
 //===----------------------------------------------------------------------===//
 
 def LogOp : FloatUnaryOp<"log"> {
   let summary = "base-e logarithm of the specified value";
 }
 
+//===----------------------------------------------------------------------===//
+// Log10Op
+//===----------------------------------------------------------------------===//
+
 def Log10Op : FloatUnaryOp<"log10"> {
   let summary = "base-10 logarithm of the specified value";
 }
 
+//===----------------------------------------------------------------------===//
+// Log1pOp
+//===----------------------------------------------------------------------===//
+
+def Log1pOp : FloatUnaryOp<"log1p"> {
+  let summary = "Computes the natural logarithm of one plus the given value";
+
+  let description = [{
+    Computes the base-e logarithm of one plus the given value. It takes one
+    operand and returns one result of the same type.
+
+    log1p(x) := log(1 + x)
+
+    Example:
+
+    ```mlir
+    %y = log1p %x : f64
+    ```
+  }];
+}
+
+//===----------------------------------------------------------------------===//
+// Log2Op
+//===----------------------------------------------------------------------===//
+
 def Log2Op : FloatUnaryOp<"log2"> {
   let summary = "base-2 logarithm of the specified value";
 }
 
 //===----------------------------------------------------------------------===//
 // MemRefCastOp
 //===----------------------------------------------------------------------===//
 

mlir/test/IR/core-ops.mlir

^bb42(%t: tensor<4x4x?xf32>, %f: f32, %i: i32, %idx : index, %j: i64, %half: f16):
   %172 = ceildivi_signed %idx, %idx : index
 
   // CHECK: %{{[0-9]+}} = ceildivi_signed %cst_5, %cst_5 : vector<42xi32>
   %173 = ceildivi_signed %vci32, %vci32 : vector<42 x i32>
 
   // CHECK: %{{[0-9]+}} = ceildivi_signed %cst_4, %cst_4 : tensor<42xi32>
   %174 = ceildivi_signed %tci32, %tci32 : tensor<42 x i32>
 
+  // CHECK: %{{[0-9]+}} = log1p %arg1 : f32
+  %175 = log1p %f : f32
+
   return
 }
 
 // CHECK-LABEL: func @affine_apply() {
 func @affine_apply() {
   %i = "std.constant"() {value = 0: index} : () -> index
   %j = "std.constant"() {value = 1: index} : () -> index