1 // RUN: %clangxx -DSUB_I32 -fsanitize=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SUB_I32
2 // RUN: %clangxx -DSUB_I64 -fsanitize=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SUB_I64
3 // RUN: %clangxx -DSUB_I128 -fsanitize=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SUB_I128
4
5 #include <stdint.h>
6 #include <stdio.h>
7
main()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( 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