staffantj added a comment.
In D86559#2242586 <https://reviews.llvm.org/D86559#2242586>, @Mordante wrote:
> if(a) // Attribute not allowed on a declaration,
>
> [[likely]] int i = 5; // but I can't think about a good use-case
> // for this code.
>
> if(a) [[likely]] { // Good allowed on the compound statement
>
> int i = 5; // Now i seems to have a purpose
> ...
>
> }
The use case for this becomes clearer when considering that the attribute that
will be used 95% of the time is [[unlikely]]. You may have a constructor that
you wish to ask the compiler to please, please, do not inline this, in a
particular function, even if the rest of that function is either likely or
neutral.
if (a)
[[unlikely]] expensive_class q{};
This could be the case if expensive_class held large static members, for
instance.
Repository:
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https://reviews.llvm.org/D86559/new/
https://reviews.llvm.org/D86559
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