Re: [patch 00/19] mutex subsystem, -V11

[Linus Torvalds]

On Thu, 5 Jan 2006, David Howells wrote:
> 
> This sort of thing is done by the compiler when it does tail-calling.

Yes. And it's nice even when unconditional branches are effectively free, 
because it can avoid an unnecessary cache miss just to fetch the 
unnecessary branch (which very much _can_ happen, since the failure 
function will sleep).

Of course, the thing to look out for is to never get the call-return stack 
messed up, but this kind of regular tail-call doesn't have that issue.

			Linus
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