[PATCH]: transform nearbyint->rint & rint/lrint->round/lround

[Richard Guenther]

On 3/10/07, Kaveh R. GHAZI <ghazi@caip.rutgers.edu> wrote:
> This patch adds transformations of the form:
>
> nearbyint -> rint (when -fno-trapping-math)
> rint -> round (when -fno-rounding-math)
> lrint -> lround (also when -fno-rounding-math)

round (0.5) is 1.0 while rint (0.5) is 0.0 - i.e. the round-to-nearest rounding
direction rounds to even while round rounds 0.5 away from zero.
So the latter two transformations are not valid.  Also lrint can be
implemented more efficient than lround for this reason.

Richard.