-fssa kicks butt on alphaev6 ieee floating point code

[Brad Lucier]

> A better register allocator would take these constraints into
> account much earlier.  A slightly smarter register allocator
> that's not quite smart enough will happily undo any changes
> that going toand from SSA form bought you.  Combine will often
> work to thwart you was well.

OK, but it didn't seem like anyone was going to rewrite the register
allocator anytime soon just so that IEEE FP arithmetic on the 21264 will
go faster, so it seems to me that adding -fssa is a reasonable strategy for 
now.

Or are you saying that adding -fssa right now will not always produce
better code on the 264 with -mieee?

Brad