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comparison clang/test/Sema/warn-bitwise-compare.c @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
parents
children c4bab56944e8
comparison
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147:c2174574ed3a 150:1d019706d866
1 // RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-bitwise-compare %s
2 // RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused %s
3
4 #define mydefine 2
5
6 enum {
7 ZERO,
8 ONE,
9 };
10
11 void f(int x) {
12 if ((8 & x) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}
13 if ((x & 8) == 4) {} // expected-warning {{bitwise comparison always evaluates to false}}
14 if ((x & 8) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
15 if ((2 & x) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
16 if ((x | 4) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}
17 if ((x | 3) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
18 if ((5 | x) != 3) {} // expected-warning {{bitwise comparison always evaluates to true}}
19 if ((x & 0x15) == 0x13) {} // expected-warning {{bitwise comparison always evaluates to false}}
20 if ((0x23 | x) == 0x155){} // expected-warning {{bitwise comparison always evaluates to false}}
21
22 if (!!((8 & x) == 3)) {} // expected-warning {{bitwise comparison always evaluates to false}}
23 int y = ((8 & x) == 3) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to false}}
24
25 if ((x & 8) == 8) {}
26 if ((x & 8) != 8) {}
27 if ((x | 4) == 4) {}
28 if ((x | 4) != 4) {}
29
30 if ((x & 9) == 8) {}
31 if ((x & 9) != 8) {}
32 if ((x | 4) == 5) {}
33 if ((x | 4) != 5) {}
34
35 if ((x & mydefine) == 8) {}
36 if ((x | mydefine) == 4) {}
37 }
38
39 void g(int x) {
40 if (x | 5) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
41 if (5 | x) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
42 if (!((x | 5))) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
43
44 if (x | -1) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
45 if (x | ONE) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
46
47 if (x | ZERO) {}
48 }