1 // RUN: %clangxx -fsanitize=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s
2 
3 #include <stdint.h>
4 
main()5 int main() {
6   // These promote to 'int'.
7   (void)(int8_t(-2) * int8_t(0x7f));
8   (void)(int16_t(0x7fff) * int16_t(0x7fff));
9   (void)(uint16_t(0xffff) * int16_t(0x7fff));
10   (void)(uint16_t(0xffff) * uint16_t(0x8000));
11 
12   // Not an unsigned overflow
13   (void)(uint16_t(0xffff) * uint16_t(0x8001));
14 
15   (void)(uint32_t(0xffffffff) * uint32_t(0x2));
16   // CHECK: umul-overflow.cpp:15:31: runtime error: unsigned integer overflow: 4294967295 * 2 cannot be represented in type 'unsigned int'
17 
18   return 0;
19 }
20