vendor/compiler-rt/compiler-rt-r172839

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/ubsan/lit_tests/Integer/umul-overflow.cpp b/lib/ubsan/lit_tests/Integer/umul-overflow.cpp
new file mode 100644
index 000000000000..42cf3a780ed0
--- /dev/null
+++ b/lib/ubsan/lit_tests/Integer/umul-overflow.cpp
@@ -0,0 +1,19 @@
+// RUN: %clang -fsanitize=unsigned-integer-overflow %s -o %t && %t 2>&1 | FileCheck %s
+
+#include <stdint.h>
+
+int main() {
+  // These promote to 'int'.
+  (void)(int8_t(-2) * int8_t(0x7f));
+  (void)(int16_t(0x7fff) * int16_t(0x7fff));
+  (void)(uint16_t(0xffff) * int16_t(0x7fff));
+  (void)(uint16_t(0xffff) * uint16_t(0x8000));
+
+  // Not an unsigned overflow
+  (void)(uint16_t(0xffff) * uint16_t(0x8001));
+
+  (void)(uint32_t(0xffffffff) * uint32_t(0x2));
+  // CHECK: umul-overflow.cpp:15:31: runtime error: unsigned integer overflow: 4294967295 * 2 cannot be represented in type 'unsigned int'
+
+  return 0;
+}