emitc: func: Set default dialect to 'emitc' (llvm#116297)

Makes `emitc.func` implement the `OpAsmOpInterface` and overwrite the
`getDefaultDialect`. This allows ops inside `emitc.func`'s body to omit
the 'emitc.' prefix in the assembly.

Author: mgehre-amd

mlir/include/mlir/Dialect/EmitC/IR/EmitC.td

@@ -21,6 +21,7 @@ include "mlir/Interfaces/CastInterfaces.td"
 include "mlir/Interfaces/ControlFlowInterfaces.td"
 include "mlir/Interfaces/FunctionInterfaces.td"
 include "mlir/Interfaces/SideEffectInterfaces.td"
+include "mlir/IR/OpAsmInterface.td"
 include "mlir/IR/RegionKindInterface.td"
 
 //===----------------------------------------------------------------------===//
@@ -632,7 +633,7 @@ def EmitC_DeclareFuncOp : EmitC_Op<"declare_func", [
 
 def EmitC_FuncOp : EmitC_Op<"func", [
   AutomaticAllocationScope,
-  FunctionOpInterface, IsolatedFromAbove
+  FunctionOpInterface, IsolatedFromAbove, OpAsmOpInterface
 ]> {
   let summary = "An operation with a name containing a single `SSACFG` region";
   let description = [{
@@ -700,6 +701,15 @@ def EmitC_FuncOp : EmitC_Op<"func", [
 
     /// Returns the result types of this function.
     ArrayRef<Type> getResultTypes() { return getFunctionType().getResults(); }
+
+    //===------------------------------------------------------------------===//
+    // OpAsmOpInterface Methods
+    //===------------------------------------------------------------------===//
+
+    /// EmitC ops in the body can omit their 'emitc.' prefix in the assembly.
+    static ::llvm::StringRef getDefaultDialect() {
+      return "emitc";
+    }
   }];
   let hasCustomAssemblyFormat = 1;
   let hasVerifier = 1;

mlir/test/Conversion/FuncToEmitC/func-to-emitc.mlir

@@ -1,15 +1,15 @@
 // RUN: mlir-opt -split-input-file -convert-func-to-emitc %s | FileCheck %s
 
 // CHECK-LABEL: emitc.func @foo()
-// CHECK-NEXT: emitc.return
+// CHECK-NEXT: return
 func.func @foo() {
   return
 }
 
 // -----
 
 // CHECK-LABEL: emitc.func private @foo() attributes {specifiers = ["static"]}
-// CHECK-NEXT: emitc.return
+// CHECK-NEXT: return
 func.func private @foo() {
   return
 }
@@ -25,7 +25,7 @@ func.func @foo(%arg0: i32) {
 // -----
 
 // CHECK-LABEL: emitc.func @foo(%arg0: i32) -> i32
-// CHECK-NEXT: emitc.return %arg0 : i32
+// CHECK-NEXT: return %arg0 : i32
 func.func @foo(%arg0: i32) -> i32 {
   return %arg0 : i32
 }
@@ -41,14 +41,14 @@ func.func @foo(%arg0: i32, %arg1: i32) -> i32 {
 // -----
 
 // CHECK-LABEL: emitc.func private @return_i32(%arg0: i32) -> i32 attributes {specifiers = ["static"]}
-// CHECK-NEXT: emitc.return %arg0 : i32
+// CHECK-NEXT: return %arg0 : i32
 func.func private @return_i32(%arg0: i32) -> i32 {
   return %arg0 : i32
 }
 
 // CHECK-LABEL: emitc.func @call(%arg0: i32) -> i32
-// CHECK-NEXT: %0 = emitc.call @return_i32(%arg0) : (i32) -> i32
-// CHECK-NEXT: emitc.return %0 : i32
+// CHECK-NEXT: %0 = call @return_i32(%arg0) : (i32) -> i32
+// CHECK-NEXT: return %0 : i32
 func.func @call(%arg0: i32) -> i32 {
   %0 = call @return_i32(%arg0) : (i32) -> (i32)
   return %0 : i32
@@ -62,14 +62,14 @@ func.func private @return_i32(%arg0: i32) -> i32
 // -----
 
 // CHECK-LABEL: emitc.func private @return_void() attributes {specifiers = ["static"]}
-// CHECK-NEXT: emitc.return
+// CHECK-NEXT: return
 func.func private @return_void() {
   return
 }
 
 // CHECK-LABEL: emitc.func @call()
-// CHECK-NEXT: emitc.call @return_void() : () -> ()
-// CHECK-NEXT: emitc.return
+// CHECK-NEXT: call @return_void() : () -> ()
+// CHECK-NEXT: return
 func.func @call() {
   call @return_void() : () -> ()
   return