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Diffstat (limited to 'test/Sema/warn-bitwise-compare.c')
| -rw-r--r-- | test/Sema/warn-bitwise-compare.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/Sema/warn-bitwise-compare.c b/test/Sema/warn-bitwise-compare.c new file mode 100644 index 0000000000000..175f8f5367f33 --- /dev/null +++ b/test/Sema/warn-bitwise-compare.c @@ -0,0 +1,28 @@ +// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-compare %s + +#define mydefine 2 + +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 ((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) {} +} |