108 lines · c
1// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-bitwise-compare %s2// RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused %s3 4#define mydefine 25#define mydefine2 -26 7enum {8 ZERO,9 ONE,10};11 12void f(int x) {13 if ((8 & x) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}14 if ((x & 8) == 4) {} // expected-warning {{bitwise comparison always evaluates to false}}15 if ((-8 & x) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}16 if ((x & -8) == 4) {} // expected-warning {{bitwise comparison always evaluates to false}}17 18 if ((x & 8) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}19 if ((2 & x) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}20 if ((x & -8) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}21 if ((-2 & x) != 3) {} // expected-warning {{bitwise comparison always evaluates to true}}22 23 if ((x | 4) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}24 if ((x | 3) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}25 if ((5 | x) != 3) {} // expected-warning {{bitwise comparison always evaluates to true}}26 27 if ((x | -4) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}28 if ((x | -3) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}29 if ((-5 | x) != 3) {} // expected-warning {{bitwise comparison always evaluates to true}}30 31 if ((x & 0x15) == 0x13) {} // expected-warning {{bitwise comparison always evaluates to false}}32 if ((x & 0xFFEB) == 0x13) {} // expected-warning {{bitwise comparison always evaluates to false}}33 34 if ((0x23 | x) == 0x155){} // expected-warning {{bitwise comparison always evaluates to false}}35 if ((0xFFDD | x) == 0x155){} // expected-warning {{bitwise comparison always evaluates to false}}36 37 if (!!((8 & x) == 3)) {} // expected-warning {{bitwise comparison always evaluates to false}}38 if (!!((-8 & x) == 3)) {} // expected-warning {{bitwise comparison always evaluates to false}}39 40 int y = ((8 & x) == 3) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to false}}41 y = ((-8 & x) == 3) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to false}}42 y = ((3 | x) != 5) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to true}}43 y = ((-3 | x) != 5) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to true}}44 45 if ((x & 0) != !0) {} // expected-warning {{bitwise comparison always evaluates to true}}46 if ((x & 0) == !0) {} // expected-warning {{bitwise comparison always evaluates to false}}47 if ((x & 2) == !0) {} // expected-warning {{bitwise comparison always evaluates to false}}48 49 if ((x | 4) == +3) {} // expected-warning {{bitwise comparison always evaluates to false}}50 if ((x | 3) != +4) {} // expected-warning {{bitwise comparison always evaluates to true}}51 52 if ((x & 8) != ~4) {} // expected-warning {{bitwise comparison always evaluates to true}}53 if ((x & 0) == ~4) {} // expected-warning {{bitwise comparison always evaluates to false}}54 55 if ((x & 8) == 8) {}56 if ((x & 8) != 8) {}57 if ((x | 4) == 4) {}58 if ((x | 4) != 4) {}59 60 if ((x | 4) == +4) {}61 if ((x | 4) != +4) {}62 63 if ((x & 1) == !12) {}64 if ((x | 0) == !0) {}65 66 if ((x | 1) == ~4) {}67 if ((x | 1) != ~0) {}68 69 if ((-2 & x) != 4) {}70 if ((x & -8) == -8) {}71 if ((x & -8) != -8) {}72 if ((x | -4) == -4) {}73 if ((x | -4) != -4) {}74 75 if ((x & 9) == 8) {}76 if ((x & 9) != 8) {}77 if ((x | 4) == 5) {}78 if ((x | 4) != 5) {}79 80 if ((x & -9) == -10) {}81 if ((x & -9) != -10) {}82 if ((x | -4) == -3) {}83 if ((x | -4) != -3) {}84 85 if ((x^0) == 0) {}86 87 if ((x & mydefine) == 8) {}88 if ((x | mydefine) == 4) {}89 90 if ((x & mydefine2) == 8) {}91 if ((x | mydefine2) == 4) {}92 93 if ((x & 1) == 1L) {}94 95 if (0 != (x | !0LL)) {} // expected-warning {{bitwise comparison always evaluates to true}}96}97 98void g(int x) {99 if (x | 5) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}100 if (5 | x) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}101 if (!((x | 5))) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}102 103 if (x | -1) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}104 if (x | ONE) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}105 106 if (x | ZERO) {}107}108