FP context switching on i386

[Till Straumann]

I might add that newlib's setjmp/longjmp implementation
for i386 saves/restores neither FP nor XMM registers.

-T.

Till Straumann wrote:
> I thought the i386 sysv ABI said that FP registers
> are not preserved across function calls -- doesn't
> this mean that there is no need for saving/restoring
> the FP context ? Am I missing something ?
>
> I was thinking about what it takes to support SSE
> and I believe it may essentially come for free
> since XMM registers seem not to be callee saved
> either. Hard to find that information though since
> e.g.,
>
> http://www.sco.com/developers/devspecs/abi386-4.pdf
>
> doesn't mention SSE yet.
>
> -- Till
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