Re: Observations on LLSC and SMP

[Ed Martini <martini@xxxxxxxxxxx>]

Daniel Jacobowitz wrote:

> On Fri, Mar 25, 2005 at 11:24:05AM -0800, Ed Martini wrote:
>  
>
> > 1. If the first part of the if were an ifdef instead it would result in 
> > a code size reduction as well as a runtime performance gain.
> >    
>
> You should spend a little time playing with an optimizing compiler. 
> They're capable of working out when a condition will always be false.
>  
Yes, but in the case where R10000_LLSC_WAR is true, but cpu_has_llsc 
returns false there are still two wasted tests, and two blocks of code 
that the compiler can't optimize out.