forked from OSchip/llvm-project
99 lines
4.2 KiB
C
99 lines
4.2 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-overlap-compare %s
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#define mydefine 2
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enum Choices {
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CHOICE_0 = 0,
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CHOICE_1 = 1
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};
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enum Unchoices {
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UNCHOICE_0 = 0,
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UNCHOICE_1 = 1
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};
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void f(int x) {
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int y = 0;
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// > || <
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if (x > 2 || x < 1) { }
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if (x > 2 || x < 2) { }
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if (x != 2 || x != 3) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x > 2 || x < 3) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x > 0 || x < 0) { }
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if (x > 2 || x <= 1) { }
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if (x > 2 || x <= 2) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x > 2 || x <= 3) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x >= 2 || x < 1) { }
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if (x >= 2 || x < 2) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x >= 2 || x < 3) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x >= 2 || x <= 1) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x >= 2 || x <= 2) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x >= 2 || x <= 3) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x >= 0 || x <= 0) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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// > && <
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if (x > 2 && x < 1) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x > 2 && x < 2) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x > 2 && x < 3) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x > 0 && x < 1) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x > 2 && x <= 1) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x > 2 && x <= 2) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x > 2 && x <= 3) { }
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if (x >= 2 && x < 1) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x >= 2 && x < 2) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x >= 2 && x < 3) { }
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if (x >= 0 && x < 0) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x >= 2 && x <= 1) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x >= 2 && x <= 2) { }
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if (x >= 2 && x <= 3) { }
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// !=, ==, ..
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if (x != 2 || x != 3) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x != 2 || x < 3) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x == 2 && x == 3) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x == 2 && x > 3) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x == 3 && x < 0) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (3 == x && x < 0) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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if (x == mydefine && x > 3) { }
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if (x == (mydefine + 1) && x > 3) { }
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if (x != CHOICE_0 || x != CHOICE_1) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (x == CHOICE_0 && x == CHOICE_1) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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// Don't warn if comparing x to different types
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if (x == CHOICE_0 && x == 1) { }
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if (x != CHOICE_0 || x != 1) { }
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// "Different types" includes different enums
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if (x == CHOICE_0 && x == UNCHOICE_1) { }
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if (x != CHOICE_0 || x != UNCHOICE_1) { }
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}
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void enums(enum Choices c) {
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if (c != CHOICE_0 || c != CHOICE_1) { } // expected-warning {{overlapping comparisons always evaluate to true}}
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if (c == CHOICE_0 && c == CHOICE_1) { } // expected-warning {{overlapping comparisons always evaluate to false}}
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// Don't warn if comparing x to different types
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if (c == CHOICE_0 && c == 1) { }
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if (c != CHOICE_0 || c != 1) { }
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// "Different types" includes different enums
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if (c == CHOICE_0 && c == UNCHOICE_1) { }
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if (c != CHOICE_0 || c != UNCHOICE_1) { }
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}
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// Don't generate a warning here.
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void array_out_of_bounds() {
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int x;
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int buffer[4];
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x = (-7 > 0) ? (buffer[-7]) : 0;
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}
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