[mlir][spirv] Add definition for GL Exp2

mlir/include/mlir/Dialect/SPIRV/IR/SPIRVGLOps.td

@@ -838,6 +838,34 @@ def SPIRV_GLAtanhOp : SPIRV_GLUnaryArithmeticOp<"Atanh", 24, SPIRV_Float16or32>
 
 // -----
 
+def SPIRV_GLExp2Op : SPIRV_GLUnaryArithmeticOp<"Exp2", 29, SPIRV_Float16or32> {
+  let summary = "Result is 2 raised to the x power";
+
+  let description = [{
+    Result is 2 raised to the x power; 2**x.
+
+    ```
+    exp2(Inf) = Inf.
+    exp2(-Inf) = +0.
+    ```
+
+    The operand x must be a scalar or vector whose component type is 16-bit or
+    32-bit floating-point.
+
+    Result Type and the type of x must be the same type. Results are computed
+    per component.
+
+    #### Example:
+
+    ```mlir
+    %2 = spirv.GL.Exp2 %0 : f32
+    %3 = spirv.GL.Exp2 %1 : vector<3xf16>
+    ```
+  }];
+}
+
+// -----
+
 def SPIRV_GLLog2Op : SPIRV_GLUnaryArithmeticOp<"Log2", 30, SPIRV_Float16or32> {
   let summary = "Result is the base-2 logarithm of x";
 

mlir/test/Dialect/SPIRV/IR/gl-ops.mlir

@@ -789,3 +789,29 @@ func.func @tanh_invalid_type(%arg0 : i32) -> () {
   %0 = spirv.GL.Tanh %arg0 : i32
   return
 }
+
+// -----
+
+//===----------------------------------------------------------------------===//
+// spirv.GL.Exp2
+//===----------------------------------------------------------------------===//
+
+func.func @exp2(%arg0 : f32) -> () {
+  // CHECK: spirv.GL.Exp2 {{%.*}} : f32
+  %0 = spirv.GL.Exp2 %arg0 : f32
+  return
+}
+
+func.func @exp2vec(%arg0 : vector<3xf16>) -> () {
+  // CHECK: spirv.GL.Exp2 {{%.*}} : vector<3xf16>
+  %0 = spirv.GL.Exp2 %arg0 : vector<3xf16>
+  return
+}
+
+// -----
+
+func.func @exp2_invalid_type(%arg0 : i32) -> () {
+  // expected-error @+1 {{op operand #0 must be 16/32-bit float or vector of 16/32-bit float values}}
+  %0 = spirv.GL.Exp2 %arg0 : i32
+  return
+}

mlir/test/Target/SPIRV/gl-ops.mlir

@@ -44,6 +44,8 @@ spirv.module Logical GLSL450 requires #spirv.vce<v1.0, [Shader], []> {
     %20 = spirv.GL.Log2 %arg0 : f32
     // CHECK: {{%.*}} = spirv.GL.Tanh {{%.*}} : f32
     %21 = spirv.GL.Tanh %arg0 : f32
+    // CHECK: {{%.*}} = spirv.GL.Exp2 {{%.*}} : f32
+    %22 = spirv.GL.Exp2 %arg0 : f32
     spirv.Return
   }