| // RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-bitwise-compare %s |
| // RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused %s |
| |
| #define mydefine 2 |
| |
| enum { |
| ZERO, |
| ONE, |
| }; |
| |
| void f(int x) { |
| if ((8 & x) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}} |
| if ((x & 8) == 4) {} // expected-warning {{bitwise comparison always evaluates to false}} |
| if ((x & 8) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}} |
| if ((2 & x) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}} |
| if ((x | 4) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}} |
| if ((x | 3) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}} |
| if ((5 | x) != 3) {} // expected-warning {{bitwise comparison always evaluates to true}} |
| if ((x & 0x15) == 0x13) {} // expected-warning {{bitwise comparison always evaluates to false}} |
| if ((0x23 | x) == 0x155){} // expected-warning {{bitwise comparison always evaluates to false}} |
| |
| if (!!((8 & x) == 3)) {} // expected-warning {{bitwise comparison always evaluates to false}} |
| int y = ((8 & x) == 3) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to false}} |
| |
| if ((x & 8) == 8) {} |
| if ((x & 8) != 8) {} |
| if ((x | 4) == 4) {} |
| if ((x | 4) != 4) {} |
| |
| if ((x & 9) == 8) {} |
| if ((x & 9) != 8) {} |
| if ((x | 4) == 5) {} |
| if ((x | 4) != 5) {} |
| |
| if ((x & mydefine) == 8) {} |
| if ((x | mydefine) == 4) {} |
| } |
| |
| void g(int x) { |
| if (x | 5) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}} |
| if (5 | x) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}} |
| if (!((x | 5))) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}} |
| |
| if (x | -1) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}} |
| if (x | ONE) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}} |
| |
| if (x | ZERO) {} |
| } |
