Message117702
[Eric]
> There's no doubt a performance issue with doing so, although someone
> would have to measure that. It may well be swamped by the memory
> allocation, etc. that is going on at the same time and so won't matter.
Yes, I think changing the FPU state involves a pipeline flush, with potentially serious performance impact. But as you say, that may well be insignificant compared with everything else that's going on.
> Mark will no doubt know this better than I do, but I also assume that
> there's an issue with thread safety when changing such global state.
I don't *think* there's an issue here: wouldn't FPU state be thread-local? |
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Date |
User |
Action |
Args |
2010-09-30 07:16:00 | mark.dickinson | set | recipients:
+ mark.dickinson, loewis, sjmachin, eric.smith, brian.curtin, skrah, Kiriakos.Vlahos |
2010-09-30 07:16:00 | mark.dickinson | set | messageid: <1285830960.35.0.687512912632.issue9980@psf.upfronthosting.co.za> |
2010-09-30 07:15:58 | mark.dickinson | link | issue9980 messages |
2010-09-30 07:15:58 | mark.dickinson | create | |
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