On Fri, 21 Feb 2014, Paul E. McKenney wrote:
> This needs to be as follows:
>
> [[carries_dependency]] int getzero(int i [[carries_dependency]])
> {
> return i - i;
> }
>
> Otherwise dependencies won't get carried through it.
C11 doesn't have attributes at all (and no specification regarding calls
and dependencies that I can see). And the way I read the C++11
specification of carries_dependency is that specifying carries_dependency
is purely about increasing optimization of the caller: that if it isn't
specified, then the caller doesn't know what dependencies might be
carried. "Note: The carries_dependency attribute does not change the
meaning of the program, but may result in generation of more efficient
code. - end note".
--
Joseph S. Myers
joseph@xxxxxxxxxxxxxxxx
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