1 // RUN: %clang -DSUB_I32 -fsanitize=unsigned-integer-overflow %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=SUB_I32 2 // RUN: %clang -DSUB_I64 -fsanitize=unsigned-integer-overflow %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=SUB_I64 3 // RUN: %clang -DSUB_I128 -fsanitize=unsigned-integer-overflow %s -o %t && %t 2>&1 | FileCheck %s --check-prefix=SUB_I128 4 5 #include <stdint.h> 6 #include <stdio.h> 7 8 int main() { 9 // These promote to 'int'. 10 (void)(uint8_t(0) - uint8_t(0x7f)); 11 (void)(uint16_t(0) - uint16_t(0x7fff)); 12 13 #ifdef SUB_I32 14 (void)(uint32_t(1) - uint32_t(2)); 15 // CHECK-SUB_I32: usub-overflow.cpp:[[@LINE-1]]:22: runtime error: unsigned integer overflow: 1 - 2 cannot be represented in type 'unsigned int' 16 #endif 17 18 #ifdef SUB_I64 19 (void)(uint64_t(8000000000000000000ll) - uint64_t(9000000000000000000ll)); 20 // CHECK-SUB_I64: 8000000000000000000 - 9000000000000000000 cannot be represented in type 'unsigned long' 21 #endif 22 23 #ifdef SUB_I128 24 # ifdef __SIZEOF_INT128__ 25 (void)((__uint128_t(1) << 126) - (__uint128_t(1) << 127)); 26 # else 27 puts("__int128 not supported\n"); 28 # endif 29 // CHECK-SUB_I128: {{0x40000000000000000000000000000000 - 0x80000000000000000000000000000000 cannot be represented in type 'unsigned __int128'|__int128 not supported}} 30 #endif 31 } 32
