Removes unneeded lookups / Adds sret to call site which fixes the mac bug

src/llvm_abi.cpp

@@ -981,16 +981,16 @@ namespace lbAbiArm64 {
 			if (size <= 16) {
 				LLVMTypeRef cast_type = nullptr;
 				if (size <= 1) {
-					cast_type = LLVMIntTypeInContext(c, 8);
+					cast_type = LLVMInt8TypeInContext(c);
 				} else if (size <= 2) {
-					cast_type = LLVMIntTypeInContext(c, 16);
+					cast_type = LLVMInt16TypeInContext(c);
 				} else if (size <= 4) {
-					cast_type = LLVMIntTypeInContext(c, 32);
+					cast_type = LLVMInt32TypeInContext(c);
 				} else if (size <= 8) {
-					cast_type = LLVMIntTypeInContext(c, 64);
+					cast_type = LLVMInt64TypeInContext(c);
 				} else {
 					unsigned count = cast(unsigned)((size+7)/8);
-					cast_type = LLVMArrayType(LLVMIntTypeInContext(c, 64), count);
+					cast_type = LLVMArrayType(LLVMInt64TypeInContext(c), count);
 				}
 				return lb_arg_type_direct(type, cast_type, nullptr, nullptr);
 			} else {
@@ -999,7 +999,7 @@ namespace lbAbiArm64 {
 			}
 		}
 	}
-
+    
 	Array<lbArgType> compute_arg_types(LLVMContextRef c, LLVMTypeRef *arg_types, unsigned arg_count) {
 		auto args = array_make<lbArgType>(heap_allocator(), arg_count);
 

src/llvm_backend_proc.cpp

@@ -736,6 +736,10 @@ lbValue lb_emit_call_internal(lbProcedure *p, lbValue value, lbValue return_ptr,
 
 		LLVMValueRef ret = LLVMBuildCall2(p->builder, fnp, fn, args, arg_count, "");
 
+		if (return_ptr.value != nullptr) {
+			LLVMAddCallSiteAttribute(ret, 1, lb_create_enum_attribute_with_type(p->module->ctx, "sret", LLVMTypeOf(args[0])));
+		}
+
 		switch (inlining) {
 		case ProcInlining_none:
 			break;