1 // RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-overlap-compare %s 2 3 #define mydefine 2 4 5 void f(int x) { 6 int y = 0; 7 8 // > || < 9 if (x > 2 || x < 1) { } 10 if (x > 2 || x < 2) { } 11 if (x != 2 || x != 3) { } // expected-warning {{overlapping comparisons always evaluate to true}} 12 if (x > 2 || x < 3) { } // expected-warning {{overlapping comparisons always evaluate to true}} 13 if (x > 0 || x < 0) { } 14 15 if (x > 2 || x <= 1) { } 16 if (x > 2 || x <= 2) { } // expected-warning {{overlapping comparisons always evaluate to true}} 17 if (x > 2 || x <= 3) { } // expected-warning {{overlapping comparisons always evaluate to true}} 18 19 if (x >= 2 || x < 1) { } 20 if (x >= 2 || x < 2) { } // expected-warning {{overlapping comparisons always evaluate to true}} 21 if (x >= 2 || x < 3) { } // expected-warning {{overlapping comparisons always evaluate to true}} 22 23 if (x >= 2 || x <= 1) { } // expected-warning {{overlapping comparisons always evaluate to true}} 24 if (x >= 2 || x <= 2) { } // expected-warning {{overlapping comparisons always evaluate to true}} 25 if (x >= 2 || x <= 3) { } // expected-warning {{overlapping comparisons always evaluate to true}} 26 if (x >= 0 || x <= 0) { } // expected-warning {{overlapping comparisons always evaluate to true}} 27 28 // > && < 29 if (x > 2 && x < 1) { } // expected-warning {{overlapping comparisons always evaluate to false}} 30 if (x > 2 && x < 2) { } // expected-warning {{overlapping comparisons always evaluate to false}} 31 if (x > 2 && x < 3) { } // expected-warning {{overlapping comparisons always evaluate to false}} 32 if (x > 0 && x < 1) { } // expected-warning {{overlapping comparisons always evaluate to false}} 33 34 if (x > 2 && x <= 1) { } // expected-warning {{overlapping comparisons always evaluate to false}} 35 if (x > 2 && x <= 2) { } // expected-warning {{overlapping comparisons always evaluate to false}} 36 if (x > 2 && x <= 3) { } 37 38 if (x >= 2 && x < 1) { } // expected-warning {{overlapping comparisons always evaluate to false}} 39 if (x >= 2 && x < 2) { } // expected-warning {{overlapping comparisons always evaluate to false}} 40 if (x >= 2 && x < 3) { } 41 if (x >= 0 && x < 0) { } // expected-warning {{overlapping comparisons always evaluate to false}} 42 43 if (x >= 2 && x <= 1) { } // expected-warning {{overlapping comparisons always evaluate to false}} 44 if (x >= 2 && x <= 2) { } 45 if (x >= 2 && x <= 3) { } 46 47 // !=, ==, .. 48 if (x != 2 || x != 3) { } // expected-warning {{overlapping comparisons always evaluate to true}} 49 if (x != 2 || x < 3) { } // expected-warning {{overlapping comparisons always evaluate to true}} 50 if (x == 2 && x == 3) { } // expected-warning {{overlapping comparisons always evaluate to false}} 51 if (x == 2 && x > 3) { } // expected-warning {{overlapping comparisons always evaluate to false}} 52 if (x == 3 && x < 0) { } // expected-warning {{overlapping comparisons always evaluate to false}} 53 if (3 == x && x < 0) { } // expected-warning {{overlapping comparisons always evaluate to false}} 54 55 if (x == mydefine && x > 3) { } 56 if (x == (mydefine + 1) && x > 3) { } 57 } 58 59 // Don't generate a warning here. 60 void array_out_of_bounds() { 61 int x; 62 int buffer[4]; 63 x = (-7 > 0) ? (buffer[-7]) : 0; 64 } 65
