c/859: sparc-specific pessimal code for simple loop

[David S. Miller]

   Date: Tue, 21 Nov 2000 23:01:19 -0800
   From: Richard Henderson <rth@redhat.com>

   This is a STRICT_ALIGNMENT machine, therefore DFmode and DImode
   operands must be 8-byte aligned, thus the EXTRA_CONSTRAINT check
   ought to be redundant, no?

I remember there were some issues with var-args, which could make
"long long" and other DF/DI mode values go into the stack only 4-byte
aligned.  This case needed to be handled, and I am pretty sure this is
where all the wacky constraint stuff comes from.

Later,
David S. Miller
davem@redhat.com