optimization/4714: Haney's real matrix performance regression

[Daniel Berlin]

On Wed, 3 Apr 2002, Paolo Carlini wrote:

> rth@gcc.gnu.org wrote:
> 
> >     Somehow we're not recognizing *any* givs.
> >
> Hi!
> 
> What will you think of me if I blatantly confess to have /no idea/ what 
> a "giv" is? :-(
> (I would like to learn more, however)

General induction variable.

for (i = 0; i < 50; i ++)
{
	a = i * 5;
}

i is a biv (basic induction variable).
a is a giv, since it's a linear function of a biv.




--Dan