[mlir][emitc] Restrict integer and float types (#85788)

Restrict which integers and floating-point types are valid in EmitC.
This should cover the types which are supported in C++ and is aligned
with what the emitter currently supports.

The checks are implemented as functions and not fully in tablegen to
allow them to be re-used by conversions to EmitC.

mlir/include/mlir/Dialect/EmitC/IR/EmitC.h

@@ -30,6 +30,10 @@
 namespace mlir {
 namespace emitc {
 void buildTerminatedBody(OpBuilder &builder, Location loc);
+/// Determines whether \p type is a valid integer type in EmitC.
+bool isSupportedIntegerType(mlir::Type type);
+/// Determines whether \p type is a valid floating-point type in EmitC.
+bool isSupportedFloatType(mlir::Type type);
 } // namespace emitc
 } // namespace mlir
 

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

@@ -51,8 +51,8 @@ class EmitC_BinaryOp<string mnemonic, list<Trait> traits = []> :
 def CExpression : NativeOpTrait<"emitc::CExpression">;
 
 // Types only used in binary arithmetic operations.
-def IntegerIndexOrOpaqueType : AnyTypeOf<[AnyInteger, Index, EmitC_OpaqueType]>;
-def FloatIntegerIndexOrOpaqueType : AnyTypeOf<[AnyFloat, IntegerIndexOrOpaqueType]>;
+def IntegerIndexOrOpaqueType : AnyTypeOf<[EmitCIntegerType, Index, EmitC_OpaqueType]>;
+def FloatIntegerIndexOrOpaqueType : AnyTypeOf<[EmitCFloatType, IntegerIndexOrOpaqueType]>;
 
 def EmitC_AddOp : EmitC_BinaryOp<"add", [CExpression]> {
   let summary = "Addition operation";

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

@@ -22,6 +22,12 @@ include "mlir/IR/BuiltinTypeInterfaces.td"
 // EmitC type definitions
 //===----------------------------------------------------------------------===//
 
+def EmitCIntegerType : Type<CPred<"emitc::isSupportedIntegerType($_self)">,
+    "integer type supported by EmitC">;
+
+def EmitCFloatType : Type<CPred<"emitc::isSupportedFloatType($_self)">,
+    "floating-point type supported by EmitC">;
+
 class EmitC_Type<string name, string typeMnemonic, list<Trait> traits = []>
     : TypeDef<EmitC_Dialect, name, traits> {
   let mnemonic = typeMnemonic;

mlir/lib/Dialect/EmitC/IR/EmitC.cpp

@@ -54,6 +54,35 @@ void mlir::emitc::buildTerminatedBody(OpBuilder &builder, Location loc) {
   builder.create<emitc::YieldOp>(loc);
 }
 
+bool mlir::emitc::isSupportedIntegerType(Type type) {
+  if (auto intType = llvm::dyn_cast<IntegerType>(type)) {
+    switch (intType.getWidth()) {
+    case 1:
+    case 8:
+    case 16:
+    case 32:
+    case 64:
+      return true;
+    default:
+      return false;
+    }
+  }
+  return false;
+}
+
+bool mlir::emitc::isSupportedFloatType(Type type) {
+  if (auto floatType = llvm::dyn_cast<FloatType>(type)) {
+    switch (floatType.getWidth()) {
+    case 32:
+    case 64:
+      return true;
+    default:
+      return false;
+    }
+  }
+  return false;
+}
+
 /// Check that the type of the initial value is compatible with the operations
 /// result type.
 static LogicalResult verifyInitializationAttribute(Operation *op,

mlir/test/Dialect/EmitC/invalid_ops.mlir

@@ -170,7 +170,7 @@ func.func @add_float_pointer(%arg0: f32, %arg1: !emitc.ptr<f32>) {
 // -----
 
 func.func @div_tensor(%arg0: tensor<i32>, %arg1: tensor<i32>) {
-    // expected-error @+1 {{'emitc.div' op operand #0 must be floating-point or integer or index or EmitC opaque type, but got 'tensor<i32>'}}
+    // expected-error @+1 {{'emitc.div' op operand #0 must be floating-point type supported by EmitC or integer type supported by EmitC or index or EmitC opaque type, but got 'tensor<i32>'}}
     %1 = "emitc.div" (%arg0, %arg1) : (tensor<i32>, tensor<i32>) -> tensor<i32>
     return
 }
@@ -178,7 +178,7 @@ func.func @div_tensor(%arg0: tensor<i32>, %arg1: tensor<i32>) {
 // -----
 
 func.func @mul_tensor(%arg0: tensor<i32>, %arg1: tensor<i32>) {
-    // expected-error @+1 {{'emitc.mul' op operand #0 must be floating-point or integer or index or EmitC opaque type, but got 'tensor<i32>'}}
+    // expected-error @+1 {{'emitc.mul' op operand #0 must be floating-point type supported by EmitC or integer type supported by EmitC or index or EmitC opaque type, but got 'tensor<i32>'}}
     %1 = "emitc.mul" (%arg0, %arg1) : (tensor<i32>, tensor<i32>) -> tensor<i32>
     return
 }
@@ -186,7 +186,7 @@ func.func @mul_tensor(%arg0: tensor<i32>, %arg1: tensor<i32>) {
 // -----
 
 func.func @rem_tensor(%arg0: tensor<i32>, %arg1: tensor<i32>) {
-    // expected-error @+1 {{'emitc.rem' op operand #0 must be integer or index or EmitC opaque type, but got 'tensor<i32>'}}
+    // expected-error @+1 {{'emitc.rem' op operand #0 must be integer type supported by EmitC or index or EmitC opaque type, but got 'tensor<i32>'}}
     %1 = "emitc.rem" (%arg0, %arg1) : (tensor<i32>, tensor<i32>) -> tensor<i32>
     return
 }
@@ -194,7 +194,7 @@ func.func @rem_tensor(%arg0: tensor<i32>, %arg1: tensor<i32>) {
 // -----
 
 func.func @rem_float(%arg0: f32, %arg1: f32) {
-    // expected-error @+1 {{'emitc.rem' op operand #0 must be integer or index or EmitC opaque type, but got 'f32'}}
+    // expected-error @+1 {{'emitc.rem' op operand #0 must be integer type supported by EmitC or index or EmitC opaque type, but got 'f32'}}
     %1 = "emitc.rem" (%arg0, %arg1) : (f32, f32) -> f32
     return
 }

mlir/test/Dialect/EmitC/invalid_types.mlir

@@ -81,3 +81,19 @@ func.func @illegal_array_with_tensor_element_type(
     %arg0: !emitc.array<4xtensor<4xi32>>
 ) {
 }
+
+// -----
+
+func.func @illegal_integer_type(%arg0: i11, %arg1: i11) -> i11 {
+    // expected-error @+1 {{'emitc.mul' op operand #0 must be floating-point type supported by EmitC or integer type supported by EmitC or index or EmitC opaque type, but got 'i11'}}
+    %mul = "emitc.mul" (%arg0, %arg1) : (i11, i11) -> i11
+    return
+}
+
+// -----
+
+func.func @illegal_float_type(%arg0: f80, %arg1: f80) {
+    // expected-error @+1 {{'emitc.mul' op operand #0 must be floating-point type supported by EmitC or integer type supported by EmitC or index or EmitC opaque type, but got 'f80'}}
+    %mul = "emitc.mul" (%arg0, %arg1) : (f80, f80) -> f80
+    return
+}