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fd874e5fb1
The patch mainly focuses on the no warnings for -Wtautological-compare. It work fine for the positive numbers but doesn't for the negative numbers. This is because the warning explicitly checks for an IntegerLiteral AST node, but -1 is represented by a UnaryOperator with an IntegerLiteral sub-Expr. Fixes #42918 Differential Revision: https://reviews.llvm.org/D130510
25 lines
941 B
C++
25 lines
941 B
C++
// 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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void test(int x) {
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bool b1 = (8 & x) == 3;
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// expected-warning@-1 {{bitwise comparison always evaluates to false}}
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bool b2 = x | 5;
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// expected-warning@-1 {{bitwise or with non-zero value always evaluates to true}}
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bool b3 = (x | 5);
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// expected-warning@-1 {{bitwise or with non-zero value always evaluates to true}}
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bool b4 = !!(x | 5);
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// expected-warning@-1 {{bitwise or with non-zero value always evaluates to true}}
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}
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template <int I, class T> // silence
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void foo(int x) {
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bool b1 = (x & sizeof(T)) == 8;
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bool b2 = (x & I) == 8;
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bool b3 = (x & 4) == 8; // expected-warning {{bitwise comparison always evaluates to false}}
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}
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void run(int x) {
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foo<4, int>(8); // expected-note {{in instantiation of function template specialization 'foo<4, int>' requested here}}
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}
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