floor on i386

[Brad Lucier]

> Major problem still remains in reload.
> If we don't want to get exact IEEE by setting proper precisity before each
> mathematic operation (as SH4 does IMO), we will run into problems with spills ,
> since these can be put in place control word is set to some wrong value
> resutlting in wrong rounding before storing.

If spills spilled the extended precision value, which is needed
anyway for proper IEEE conformance, this wouldn't be an issue.

Brad