20 lines · cpp
1// RUN: %clangxx -fsanitize=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s2 3#include <stdint.h>4 5int 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 overflow13 (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}20