Mercurial > hg > CbC > CbC_llvm

annotate clang/test/Sema/warn-bitwise-compare.c @ 169:1f21f60db75c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added tag llvm10 for changeset 980e56f2e095
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 09:26:57 +0900
parents 1d019706d866
children c4bab56944e8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
150
anatofuz
parents:
diff changeset
1 // RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-bitwise-compare %s
anatofuz
parents:
diff changeset
2 // RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused %s
anatofuz
parents:
diff changeset
3
anatofuz
parents:
diff changeset
4 #define mydefine 2
anatofuz
parents:
diff changeset
5
anatofuz
parents:
diff changeset
6 enum {
anatofuz
parents:
diff changeset
7 ZERO,
anatofuz
parents:
diff changeset
8 ONE,
anatofuz
parents:
diff changeset
9 };
anatofuz
parents:
diff changeset
10
anatofuz
parents:
diff changeset
11 void f(int x) {
anatofuz
parents:
diff changeset
12 if ((8 & x) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}
anatofuz
parents:
diff changeset
13 if ((x & 8) == 4) {} // expected-warning {{bitwise comparison always evaluates to false}}
anatofuz
parents:
diff changeset
14 if ((x & 8) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
anatofuz
parents:
diff changeset
15 if ((2 & x) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
anatofuz
parents:
diff changeset
16 if ((x | 4) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}
anatofuz
parents:
diff changeset
17 if ((x | 3) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
anatofuz
parents:
diff changeset
18 if ((5 | x) != 3) {} // expected-warning {{bitwise comparison always evaluates to true}}
anatofuz
parents:
diff changeset
19 if ((x & 0x15) == 0x13) {} // expected-warning {{bitwise comparison always evaluates to false}}
anatofuz
parents:
diff changeset
20 if ((0x23 | x) == 0x155){} // expected-warning {{bitwise comparison always evaluates to false}}
anatofuz
parents:
diff changeset
21
anatofuz
parents:
diff changeset
22 if (!!((8 & x) == 3)) {} // expected-warning {{bitwise comparison always evaluates to false}}
anatofuz
parents:
diff changeset
23 int y = ((8 & x) == 3) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to false}}
anatofuz
parents:
diff changeset
24
anatofuz
parents:
diff changeset
25 if ((x & 8) == 8) {}
anatofuz
parents:
diff changeset
26 if ((x & 8) != 8) {}
anatofuz
parents:
diff changeset
27 if ((x | 4) == 4) {}
anatofuz
parents:
diff changeset
28 if ((x | 4) != 4) {}
anatofuz
parents:
diff changeset
29
anatofuz
parents:
diff changeset
30 if ((x & 9) == 8) {}
anatofuz
parents:
diff changeset
31 if ((x & 9) != 8) {}
anatofuz
parents:
diff changeset
32 if ((x | 4) == 5) {}
anatofuz
parents:
diff changeset
33 if ((x | 4) != 5) {}
anatofuz
parents:
diff changeset
34
anatofuz
parents:
diff changeset
35 if ((x & mydefine) == 8) {}
anatofuz
parents:
diff changeset
36 if ((x | mydefine) == 4) {}
anatofuz
parents:
diff changeset
37 }
anatofuz
parents:
diff changeset
38
anatofuz
parents:
diff changeset
39 void g(int x) {
anatofuz
parents:
diff changeset
40 if (x | 5) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
anatofuz
parents:
diff changeset
41 if (5 | x) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
anatofuz
parents:
diff changeset
42 if (!((x | 5))) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
anatofuz
parents:
diff changeset
43
anatofuz
parents:
diff changeset
44 if (x | -1) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
anatofuz
parents:
diff changeset
45 if (x | ONE) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
anatofuz
parents:
diff changeset
46
anatofuz
parents:
diff changeset
47 if (x | ZERO) {}
anatofuz
parents:
diff changeset
48 }