Re: Questions on this... (Lazy FPU gone from x86 platform)

Rob Dale (
Mon, 27 Jul 1998 00:40:44 -0400

Adam J. Richter wrote:
> I see that the lazy FPU save and restore optimization have
> been removed from the latest 2.1 kernel. The comment in
> arch/i386/kernel/process.c says "Lazy FP saving no longer makes any
> sense with modern CPU's, and this simplifies a lot of things (SMP
> and UP become the same)."

How does this affect MMX and 3DNow! instructions that use
FPU save/restore? Or is that handled though gcc and not the kernel?

Robert Dale

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