08196e0b2e
This is the initial part of the implementation of the C++20 likelihood attributes. It handles the attributes in an if statement. Differential Revision: https://reviews.llvm.org/D85091
52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
// RUN: %clang_cc1 %s -fsyntax-only -fdouble-square-bracket-attributes -verify
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void g() {
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if (1)
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[[clang::likely]] {}
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}
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void m() {
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[[clang::likely]] int x = 42; // expected-error {{'likely' attribute cannot be applied to a declaration}}
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if (x)
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[[clang::unlikely]] {}
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if (x) {
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[[clang::unlikely]];
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}
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switch (x) {
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case 1:
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[[clang::likely]] {}
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break;
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[[clang::likely]] case 2 : case 3 : {}
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break;
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}
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do {
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[[clang::unlikely]];
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} while (x);
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do
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[[clang::unlikely]] {}
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while (x);
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do { // expected-note {{to match this 'do'}}
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}
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[[clang::unlikely]] while (x); // expected-error {{expected 'while' in do/while loop}}
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for (;;)
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[[clang::unlikely]] {}
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for (;;) {
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[[clang::unlikely]];
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}
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while (x)
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[[clang::unlikely]] {}
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while (x) {
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[[clang::unlikely]];
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}
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if (x)
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goto lbl;
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// FIXME: allow the attribute on the label
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[[clang::unlikely]] lbl : // expected-error {{'unlikely' attribute cannot be applied to a declaration}}
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[[clang::likely]] x = x + 1;
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[[clang::likely]]++ x;
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}
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