Add intrinsics `add_sat` and `sub_sat`

src/check_builtin.cpp

@@ -4261,6 +4261,8 @@ gb_internal bool check_builtin_procedure(CheckerContext *c, Operand *operand, As
 	case BuiltinProc_overflow_add:
 	case BuiltinProc_overflow_sub:
 	case BuiltinProc_overflow_mul:
+	case BuiltinProc_add_sat:
+	case BuiltinProc_sub_sat:
 		{
 			Operand x = {};
 			Operand y = {};

src/checker_builtin_procs.hpp

@@ -70,6 +70,9 @@ enum BuiltinProcId {
 	BuiltinProc_overflow_sub,
 	BuiltinProc_overflow_mul,
 
+	BuiltinProc_add_sat,
+	BuiltinProc_sub_sat,
+
 	BuiltinProc_sqrt,
 	BuiltinProc_fused_mul_add,
 
@@ -393,6 +396,9 @@ gb_global BuiltinProc builtin_procs[BuiltinProc_COUNT] = {
 	{STR_LIT("overflow_sub"), 2, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("overflow_mul"), 2, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 
+	{STR_LIT("add_sat"), 2, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+	{STR_LIT("sub_sat"), 2, false, Expr_Expr, BuiltinProcPkg_intrinsics},
+
 	{STR_LIT("sqrt"), 1, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 	{STR_LIT("fused_mul_add"), 3, false, Expr_Expr, BuiltinProcPkg_intrinsics},
 

src/llvm_backend_proc.cpp

@@ -2236,6 +2236,8 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
 	case BuiltinProc_overflow_add:
 	case BuiltinProc_overflow_sub:
 	case BuiltinProc_overflow_mul:
+	case BuiltinProc_add_sat:
+	case BuiltinProc_sub_sat:
 		{
 			Type *main_type = tv.type;
 			Type *type = main_type;
@@ -2254,12 +2256,16 @@ gb_internal lbValue lb_build_builtin_proc(lbProcedure *p, Ast *expr, TypeAndValu
 				case BuiltinProc_overflow_add: name = "llvm.uadd.with.overflow"; break;
 				case BuiltinProc_overflow_sub: name = "llvm.usub.with.overflow"; break;
 				case BuiltinProc_overflow_mul: name = "llvm.umul.with.overflow"; break;
+				case BuiltinProc_add_sat:      name = "llvm.uadd.sat"; break;
+				case BuiltinProc_sub_sat:      name = "llvm.usub.sat"; break;
 				}
 			} else {
 				switch (id) {
 				case BuiltinProc_overflow_add: name = "llvm.sadd.with.overflow"; break;
 				case BuiltinProc_overflow_sub: name = "llvm.ssub.with.overflow"; break;
 				case BuiltinProc_overflow_mul: name = "llvm.smul.with.overflow"; break;
+				case BuiltinProc_add_sat:      name = "llvm.sadd.sat"; break;
+				case BuiltinProc_sub_sat:      name = "llvm.ssub.sat"; break;
 				}
 			}
 			LLVMTypeRef types[1] = {lb_type(p->module, type)};