[PATCH] fold-const.c use of BRANCH_COST

[Geoff Keating]

Andrew Pinski <pinskia@physics.uc.edu> writes:

> Because with BRANCH_COST set to 3, gcc on PPC produces
> serializing instructions (adde, subfe, subfme, subfze) on some
> processors, like 750 and 7400.
> It also sometimes produces smaller code.

If these instructions are serializing, it's probably not useful for
GCC to be producing them at all on these processors; they'll always be
slower than a branch.

-- 
- Geoffrey Keating <geoffk@geoffk.org>