1 files changed, 93 insertions, 0 deletions
diff --git a/test/SemaCXX/builtins-overflow.cpp b/test/SemaCXX/builtins-overflow.cpp
new file mode 100644
index 0000000000000..65733c0c154f5
--- /dev/null
+++ b/test/SemaCXX/builtins-overflow.cpp
@@ -0,0 +1,93 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify %s
+// expected-no-diagnostics
+
+#include <limits.h>
+
+int a() {
+  const int x = 3;
+  static int z;
+  constexpr int *y = &z;
+  return []() { return __builtin_sub_overflow((int)x, (int)x, (int *)y); }();
+}
+int a2() {
+  const int x = 3;
+  static int z;
+  constexpr int *y = &z;
+  return []() { return __builtin_sub_overflow(x, x, y); }();
+}
+
+template<typename T>
+struct Result {
+  bool B;
+  T Value;
+  constexpr bool operator==(const Result<T> &Other) {
+    return B == Other.B && Value == Other.Value;
+  }
+};
+
+
+template <typename RET, typename LHS, typename RHS>
+constexpr Result<RET> add(LHS &&lhs, RHS &&rhs) {
+  RET sum{};
+  return {__builtin_add_overflow(lhs, rhs, &sum), sum};
+}
+
+static_assert(add<short>(static_cast<char>(120), static_cast<char>(10)) == Result<short>{false, 130});
+static_assert(add<char>(static_cast<short>(120), static_cast<short>(10)) == Result<char>{true, -126});
+static_assert(add<unsigned int>(INT_MAX, INT_MAX) == Result<unsigned int>{false, static_cast<unsigned int>(INT_MAX) * 2u});
+static_assert(add<int>(static_cast<unsigned int>(INT_MAX), 1u) == Result<int>{true, INT_MIN});
+
+static_assert(add<int>(17, 22) == Result<int>{false, 39});
+static_assert(add<int>(INT_MAX - 22, 24) == Result<int>{true, INT_MIN + 1});
+static_assert(add<int>(INT_MIN + 22, -23) == Result<int>{true, INT_MAX});
+
+template <typename RET, typename LHS, typename RHS>
+constexpr Result<RET> sub(LHS &&lhs, RHS &&rhs) {
+  RET sum{};
+  return {__builtin_sub_overflow(lhs, rhs, &sum), sum};
+}
+
+static_assert(sub<unsigned char>(static_cast<char>(0),static_cast<char>(1)) == Result<unsigned char>{true, UCHAR_MAX});
+static_assert(sub<char>(static_cast<unsigned char>(0),static_cast<unsigned char>(1)) == Result<char>{false, -1});
+static_assert(sub<unsigned short>(static_cast<short>(0),static_cast<short>(1)) == Result<unsigned short>{true, USHRT_MAX});
+
+static_assert(sub<int>(17,22) == Result<int>{false, -5});
+static_assert(sub<int>(INT_MAX - 22, -23) == Result<int>{true, INT_MIN});
+static_assert(sub<int>(INT_MIN + 22, 23) == Result<int>{true, INT_MAX});
+
+template <typename RET, typename LHS, typename RHS>
+constexpr Result<RET> mul(LHS &&lhs, RHS &&rhs) {
+  RET sum{};
+  return {__builtin_mul_overflow(lhs, rhs, &sum), sum};
+}
+
+static_assert(mul<int>(17,22) == Result<int>{false, 374});
+static_assert(mul<int>(INT_MAX / 22, 23) == Result<int>{true, -2049870757});
+static_assert(mul<int>(INT_MIN / 22, -23) == Result<int>{true, -2049870757});
+
+constexpr Result<int> sadd(int lhs, int rhs) {
+  int sum{};
+  return {__builtin_sadd_overflow(lhs, rhs, &sum), sum};
+}
+
+static_assert(sadd(17,22) == Result<int>{false, 39});
+static_assert(sadd(INT_MAX - 22, 23) == Result<int>{true, INT_MIN});
+static_assert(sadd(INT_MIN + 22, -23) == Result<int>{true, INT_MAX});
+
+constexpr Result<int> ssub(int lhs, int rhs) {
+  int sum{};
+  return {__builtin_ssub_overflow(lhs, rhs, &sum), sum};
+}
+
+static_assert(ssub(17,22) == Result<int>{false, -5});
+static_assert(ssub(INT_MAX - 22, -23) == Result<int>{true, INT_MIN});
+static_assert(ssub(INT_MIN + 22, 23) == Result<int>{true, INT_MAX});
+
+constexpr Result<int> smul(int lhs, int rhs) {
+  int sum{};
+  return {__builtin_smul_overflow(lhs, rhs, &sum), sum};
+}
+
+static_assert(smul(17,22) == Result<int>{false, 374});
+static_assert(smul(INT_MAX / 22, 23) == Result<int>{true, -2049870757});
+static_assert(smul(INT_MIN / 22, -23) == Result<int>{true, -2049870757});