attr-likelihood.c
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// RUN: %clang_cc1 %s -fsyntax-only -fdouble-square-bracket-attributes -verify
void g() {
if (1)
[[clang::likely]] {}
}
void m() {
[[clang::likely]] int x = 42; // expected-error {{'likely' attribute cannot be applied to a declaration}}
if (x)
[[clang::unlikely]] {}
if (x) {
[[clang::unlikely]];
}
switch (x) {
case 1:
[[clang::likely]] {}
break;
[[clang::likely]] case 2 : case 3 : {}
break;
}
do {
[[clang::unlikely]];
} while (x);
do
[[clang::unlikely]] {}
while (x);
do { // expected-note {{to match this 'do'}}
}
[[clang::unlikely]] while (x); // expected-error {{expected 'while' in do/while loop}}
for (;;)
[[clang::unlikely]] {}
for (;;) {
[[clang::unlikely]];
}
while (x)
[[clang::unlikely]] {}
while (x) {
[[clang::unlikely]];
}
if (x)
goto lbl;
// FIXME: allow the attribute on the label
[[clang::unlikely]] lbl : // expected-error {{'unlikely' attribute cannot be applied to a declaration}}
[[clang::likely]] x = x + 1;
[[clang::likely]]++ x;
}