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Re: Sleazy FPU optimization

On Mon, Feb 11, 2008 at 07:43:09PM +0100, Joerg Sonnenberger wrote:
> We've been discussing whether or not it is worth to do lazy FPU context
> saving at all. Most programs will use the FPU on i386 anyway, e.g. if
> printf is used. I'm not sure it will actually help.

FWIW: I did some tests with sparc64 some time ago, checking wether during
it's lifetime an lwp ever had a fpu state saved. I never found a single
(userland) lwp exiting that never had fpu state.


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