IF conversion bug with CC0

[Eric Botcazou]

> I took a quick look at Visium, and noticed arithmetic instructions in
> the .md file doing a lot of clobbering of the condition codes register.
> This doesn't seem very efficient, since it prevents the arithmetic
> instructions from being able to set the CC register and have that value
> be used.

See the define_subst patterns, they automatically compute the other form.

-- 
Eric Botcazou