unsigned integer constraint (uint)

compiler/types/types.odin

@@ -44,6 +44,7 @@ BOOL :: Type(29)
 FLOAT :: Type(30)
 RANGE :: Type(31)
 ANYOPAQUE :: Type(32)
+UINT :: Type(33)
 
 DYNAMIC_START :: Type(64)
 
@@ -59,6 +60,7 @@ Kind :: enum u8 {
 	Void,
 	Anyopaque,
 	Int_Constraint,
+	Uint_Constraint,
 	Float_Constraint,
 	Range_Constraint,
 	Scalar,
@@ -595,6 +597,8 @@ kind :: proc(value: Type, store: ^Store = nil) -> Kind {
 		return .Anyopaque
 	case INT:
 		return .Int_Constraint
+	case UINT:
+		return .Uint_Constraint
 	case FLOAT:
 		return .Float_Constraint
 	case RANGE:
@@ -642,7 +646,7 @@ is_bool :: proc(value: Type) -> bool {
 }
 
 is_constraint :: proc(value: Type) -> bool {
-	return value == INT || value == FLOAT || value == RANGE
+	return value == INT || value == UINT || value == FLOAT || value == RANGE
 }
 
 // constraint_target reports the concrete type a constraint binding (local, or a
@@ -656,6 +660,8 @@ constraint_target :: proc(constraint, inferred: Type, store: ^Store = nil) -> Ty
 	switch constraint {
 	case INT:
 		return inferred if is_concrete_integer(inferred) else INVALID
+	case UINT:
+		return inferred if is_unsigned(inferred) else INVALID
 	case FLOAT:
 		if is_float(inferred) {
 			return inferred
@@ -673,6 +679,8 @@ constraint_accepts :: proc(constraint, concrete: Type, store: ^Store = nil) -> b
 	switch constraint {
 	case INT:
 		return is_concrete_integer(concrete)
+	case UINT:
+		return is_unsigned(concrete)
 	case FLOAT:
 		return is_float(concrete)
 	case RANGE:
@@ -1686,6 +1694,19 @@ smallest_signed_for_literal :: proc(value: i64) -> Type {
 	return I64
 }
 
+smallest_unsigned_for_literal :: proc(value: u64) -> Type {
+	if value <= 255 {
+		return U8
+	}
+	if value <= 65535 {
+		return U16
+	}
+	if value <= 4294967295 {
+		return U32
+	}
+	return U64
+}
+
 name :: proc(value: Type) -> string {
 	switch value {
 	case INVALID:       return "<invalid>"
@@ -1693,6 +1714,7 @@ name :: proc(value: Type) -> string {
 	case ANYOPAQUE:     return "anyopaque"
 	case BOOL:          return "bool"
 	case INT:           return "int"
+	case UINT:          return "uint"
 	case FLOAT:         return "float"
 	case RANGE:         return "range"
 	case I8:            return "i8"