fix test for builtin-bswapg

Author: clingfei

clang/test/CodeGen/builtins.c

@@ -132,8 +132,8 @@ int main(void) {
   // Whatever
   P(bswapg, ((char)N));
   P(bswapg, ((short)N));
-	P(bswapg, ((int)N));
-	P(bswapg, ((unsigned long)N));
+  P(bswapg, ((int)N));
+  P(bswapg, ((unsigned long)N));
   P(bswap16, (N));
   P(bswap32, (N));
   P(bswap64, (N));

clang/test/Sema/builtin-bswapg.cpp

@@ -0,0 +1,85 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify -fexperimental-new-constant-interpreter %s
+// expected-no-diagnostics
+
+void test_basic_type_checks() {
+  static_assert(__is_same(char, decltype(__builtin_bswapg((char)0))), "");
+  static_assert(__is_same(unsigned char, decltype(__builtin_bswapg((unsigned char)0))), "");
+  static_assert(__is_same(short, decltype(__builtin_bswapg((short)0))), "");
+  static_assert(__is_same(unsigned short, decltype(__builtin_bswapg((unsigned short)0))), "");
+  static_assert(__is_same(int, decltype(__builtin_bswapg((int)0))), "");
+  static_assert(__is_same(unsigned int, decltype(__builtin_bswapg((unsigned int)0))), "");
+  static_assert(__is_same(long, decltype(__builtin_bswapg((long)0))), "");
+  static_assert(__is_same(unsigned long, decltype(__builtin_bswapg((unsigned long)0))), "");
+}
+
+template<typename T>
+void test_template_type_check() {
+  static_assert(__is_same(T, decltype(__builtin_bswapg(T{}))), 
+                "bswapg should return the same type as its argument");
+  constexpr T zero{};
+  constexpr T max = ~T{};
+  constexpr T one = T{1};
+    
+  static_assert(__is_same(T, decltype(__builtin_bswapg(zero))), "");
+  static_assert(__is_same(T, decltype(__builtin_bswapg(max))), "");
+  static_assert(__is_same(T, decltype(__builtin_bswapg(one))), "");
+}
+template void test_template_type_check<char>();
+template void test_template_type_check<unsigned char>();
+template void test_template_type_check<short>();
+template void test_template_type_check<unsigned short>();
+template void test_template_type_check<int>();
+template void test_template_type_check<unsigned int>();
+template void test_template_type_check<long>();
+template void test_template_type_check<unsigned long>();
+
+void test_lambda_type_checks() {
+  auto lambda = [](auto x) {
+    static_assert(__is_same(decltype(x), decltype(__builtin_bswapg(x))), 
+                  "bswapg in lambda should preserve type");
+    return __builtin_bswapg(x);
+  };
+  auto result_long = lambda(42UL);
+  static_assert(__is_same(unsigned long, decltype(result_long)), "");
+    
+  auto result_int = lambda(42);
+  static_assert(__is_same(int, decltype(result_int)), "");
+    
+  auto result_short = lambda(static_cast<short>(42));
+  static_assert(__is_same(short, decltype(result_short)), "");
+
+  auto result_char = lambda(static_cast<char>(42));
+  static_assert(__is_same(char, decltype(result_char)), "");
+}
+
+decltype(auto) test_decltype_auto(int x) {
+  return __builtin_bswapg(x);
+}
+
+void test_decltype_auto_check() {
+  int x = 42;
+  auto result = test_decltype_auto(x);
+  static_assert(__is_same(int, decltype(result)), "");
+}
+
+template<auto Value>
+struct ValueTemplateTypeTest {
+  using value_type = decltype(Value);
+  using result_type = decltype(__builtin_bswapg(Value));
+    
+  static constexpr bool type_matches = __is_same(value_type, result_type);
+  static_assert(type_matches, "Value template bswapg should preserve type");
+    
+  static constexpr auto swapped_value = __builtin_bswapg(Value);
+};
+
+template<auto... Values>
+void test_template_pack_types() {
+  static_assert((__is_same(decltype(Values), decltype(__builtin_bswapg(Values))) && ...), "All pack elements should preserve type");
+}
+
+template struct ValueTemplateTypeTest<0x1234>;
+template struct ValueTemplateTypeTest<0x12345678UL>;
+template struct ValueTemplateTypeTest<(short)0x1234>;
+template struct ValueTemplateTypeTest<(char)0x12>;