On Wed, Apr 4, 2012 at 5:07 PM, Teresa Johnson <tejohn...@google.com> wrote: > New patch to avoid LCP stalls based on feedback from earlier patch. I modified > H.J.'s old patch to perform the peephole2 to split immediate moves to HImode > memory. This is now enabled for Core2, Corei7 and Generic. > > I verified that this enables the splitting to occur in the case that > originally > motivated the optimization. If we subsequently find situations where LCP > stalls > are hurting performance but an extra register is required to perform the > splitting, then we can revisit whether this should be performed earlier. > > I also measured SPEC 2000/2006 performance using Generic64 on an AMD Opteron > and the results were neutral. >
What are the performance impacts on Core i7? I didn't notice any significant changes when I worked on it for Core 2. Thanks. -- H.J.
