49 lines
2.0 KiB
C
49 lines
2.0 KiB
C
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// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-bitwise-compare %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused %s
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#define mydefine 2
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enum {
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ZERO,
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ONE,
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};
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void f(int x) {
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if ((8 & x) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}
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if ((x & 8) == 4) {} // expected-warning {{bitwise comparison always evaluates to false}}
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if ((x & 8) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
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if ((2 & x) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
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if ((x | 4) == 3) {} // expected-warning {{bitwise comparison always evaluates to false}}
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if ((x | 3) != 4) {} // expected-warning {{bitwise comparison always evaluates to true}}
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if ((5 | x) != 3) {} // expected-warning {{bitwise comparison always evaluates to true}}
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if ((x & 0x15) == 0x13) {} // expected-warning {{bitwise comparison always evaluates to false}}
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if ((0x23 | x) == 0x155){} // expected-warning {{bitwise comparison always evaluates to false}}
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if (!!((8 & x) == 3)) {} // expected-warning {{bitwise comparison always evaluates to false}}
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int y = ((8 & x) == 3) ? 1 : 2; // expected-warning {{bitwise comparison always evaluates to false}}
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if ((x & 8) == 8) {}
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if ((x & 8) != 8) {}
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if ((x | 4) == 4) {}
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if ((x | 4) != 4) {}
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if ((x & 9) == 8) {}
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if ((x & 9) != 8) {}
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if ((x | 4) == 5) {}
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if ((x | 4) != 5) {}
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if ((x & mydefine) == 8) {}
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if ((x | mydefine) == 4) {}
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}
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void g(int x) {
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if (x | 5) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
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if (5 | x) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
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if (!((x | 5))) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
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if (x | -1) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
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if (x | ONE) {} // expected-warning {{bitwise or with non-zero value always evaluates to true}}
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if (x | ZERO) {}
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}
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