compiler-rt/test/ubsan/TestCases/Integer/umul-overflow.cpp

   1 // RUN: %clangxx -fsanitize=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s
   2
   3 #include <stdint.h>
   4
   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 '{{uint32_t|unsigned int}}'
  17
  18   return 0;
  19 }