Segher Boessenkool wrote:
> Of course I see that ldp is useful. I don't think that this particular
> way of forcing more pairs is a good idea. Needs testing / benchmarking /
> instrumentation, and we haven't seen any of that.
I wouldn't propose a patch if it caused slowdowns. In fact I am seeing speedups,
particularly benchmarks which benefit from shrinkwrapping (eg. povray). Int is
flat, and there is an overall gain on fp.
> Forcing pairs before separate shrink-wrapping reduces the effectiveness
> of the latter by a lot.
That doesn't appear to be the case - or at least any reduction in effectiveness
is
more than mitigated by the lower number of memory accesses and I-cache misses.
To do better still you'd need to compute an optimal set of pairs, and that is
quite
difficult in the current infrastructure. I could dynamically create pairs just
in the backend
but that won't be optimal either.
Wilco
