--- a/clang/test/Sema/attr-swiftcall.c	Sun Jul 18 22:10:01 2021 +0900
+++ b/clang/test/Sema/attr-swiftcall.c	Sun Jul 18 22:43:00 2021 +0900
@@ -2,22 +2,30 @@
 // RUN: %clang_cc1 -triple x86_64-unknown-windows -fsyntax-only -verify %s
 
 #define SWIFTCALL __attribute__((swiftcall))
+#define SWIFTASYNCCALL __attribute__((swiftasynccall))
 #define INDIRECT_RESULT __attribute__((swift_indirect_result))
 #define ERROR_RESULT __attribute__((swift_error_result))
 #define CONTEXT __attribute__((swift_context))
 #define ASYNC_CONTEXT __attribute__((swift_async_context))
 
 int notAFunction SWIFTCALL; // expected-warning {{'swiftcall' only applies to function types; type here is 'int'}}
+int notAnAsyncFunction SWIFTASYNCCALL; // expected-warning {{'swiftasynccall' only applies to function types; type here is 'int'}}
 void variadic(int x, ...) SWIFTCALL; // expected-error {{variadic function cannot use swiftcall calling convention}}
+void variadic_async(int x, ...) SWIFTASYNCCALL; // expected-error {{variadic function cannot use swiftasynccall calling convention}}
 void unprototyped() SWIFTCALL; // expected-error {{function with no prototype cannot use the swiftcall calling convention}}
+void unprototyped_async() SWIFTASYNCCALL; // expected-error {{function with no prototype cannot use the swiftasynccall calling convention}}
 void multiple_ccs(int x) SWIFTCALL __attribute__((vectorcall)); // expected-error {{vectorcall and swiftcall attributes are not compatible}}
+void multiple_ccs_async(int x) SWIFTASYNCCALL __attribute__((vectorcall)); // expected-error {{vectorcall and swiftasynccall attributes are not compatible}}
 void (*functionPointer)(void) SWIFTCALL;
+void (*asyncFunctionPointer)(void) SWIFTASYNCCALL;
 
-void indirect_result_nonswift(INDIRECT_RESULT void *out); // expected-error {{'swift_indirect_result' parameter can only be used with swiftcall calling convention}}
+void indirect_result_nonswift(INDIRECT_RESULT void *out); // expected-error {{'swift_indirect_result' parameter can only be used with swiftcall or swiftasynccall calling convention}}
 void indirect_result_bad_position(int first, INDIRECT_RESULT void *out) SWIFTCALL; // expected-error {{'swift_indirect_result' parameters must be first parameters of function}}
 void indirect_result_bad_type(INDIRECT_RESULT int out) SWIFTCALL; // expected-error {{'swift_indirect_result' parameter must have pointer type; type here is 'int'}}
 void indirect_result_single(INDIRECT_RESULT void *out) SWIFTCALL;
 void indirect_result_multiple(INDIRECT_RESULT void *out1, INDIRECT_RESULT void *out2) SWIFTCALL;
+void indirect_result_single_async(INDIRECT_RESULT void *out) SWIFTASYNCCALL;
+void indirect_result_multiple_async(INDIRECT_RESULT void *out1, INDIRECT_RESULT void *out2) SWIFTASYNCCALL;
 
 void error_result_nonswift(ERROR_RESULT void **error); // expected-error {{'swift_error_result' parameter can only be used with swiftcall calling convention}} expected-error{{'swift_error_result' parameter must follow 'swift_context' parameter}}
 void error_result_bad_position2(int first, ERROR_RESULT void **error) SWIFTCALL; // expected-error {{'swift_error_result' parameter must follow 'swift_context' parameter}}
@@ -26,10 +34,12 @@
 void error_result_okay(int a, int b, CONTEXT void *context, ERROR_RESULT void **error) SWIFTCALL;
 void error_result_okay2(CONTEXT void *context, ERROR_RESULT void **error, void *selfType, char **selfWitnessTable) SWIFTCALL;
 
-void context_nonswift(CONTEXT void *context); // expected-error {{'swift_context' parameter can only be used with swiftcall calling convention}}
+void context_nonswift(CONTEXT void *context); // expected-error {{'swift_context' parameter can only be used with swiftcall or swiftasynccall calling convention}}
 void context_bad_type(CONTEXT int context) SWIFTCALL; // expected-error {{'swift_context' parameter must have pointer type; type here is 'int'}}
 void context_okay(CONTEXT void *context) SWIFTCALL;
 void context_okay2(CONTEXT void *context, void *selfType, char **selfWitnessTable) SWIFTCALL;
+void context_okay_async(CONTEXT void *context) SWIFTASYNCCALL;
+void context_okay2_async(CONTEXT void *context, void *selfType, char **selfWitnessTable) SWIFTASYNCCALL;
 
 void async_context_okay_for_now(ASYNC_CONTEXT void *context);
 void async_context_bad_type(ASYNC_CONTEXT int context) SWIFTCALL; // expected-error {{'swift_async_context' parameter must have pointer type; type here is 'int'}}