llvm: implement explicit Win64 and SysV calling conventions

2 files changed, 28 insertions, 0 deletions

diff --git a/test/c_abi/cfuncs.c b/test/c_abi/cfuncs.c
index bd249335c5..bdf58db335 100644
--- a/test/c_abi/cfuncs.c
+++ b/test/c_abi/cfuncs.c
@@ -1015,3 +1015,15 @@ void __attribute__((stdcall)) stdcall_big_union(union BigUnion x) {
     assert_or_panic(x.a.c == 3);
     assert_or_panic(x.a.d == 4);
 }
+
+#ifdef __x86_64__
+struct ByRef __attribute__((ms_abi)) c_explict_win64(struct ByRef in) {
+    in.val = 42;
+    return in;
+}
+
+struct ByRef __attribute__((sysv_abi)) c_explict_sys_v(struct ByRef in) {
+    in.val = 42;
+    return in;
+}
+#endif
diff --git a/test/c_abi/main.zig b/test/c_abi/main.zig
index 358e15a929..db76697473 100644
--- a/test/c_abi/main.zig
+++ b/test/c_abi/main.zig
@@ -1190,3 +1190,19 @@ test "Stdcall ABI big union" {
     };
     stdcall_big_union(x);
 }
+
+extern fn c_explict_win64(ByRef) callconv(.Win64) ByRef;
+test "explicit SysV calling convention" {
+    if (builtin.cpu.arch != .x86_64) return error.SkipZigTest;
+
+    const res = c_explict_win64(.{ .val = 1, .arr = undefined });
+    try expect(res.val == 42);
+}
+
+extern fn c_explict_sys_v(ByRef) callconv(.SysV) ByRef;
+test "explicit Win64 calling convention" {
+    if (builtin.cpu.arch != .x86_64) return error.SkipZigTest;
+
+    const res = c_explict_sys_v(.{ .val = 1, .arr = undefined });
+    try expect(res.val == 42);
+}