[PATCH] Prefer small negative constants in InstCombine

[Chris Lattner]

On Jun 26, 2013, at 6:56 AM, Tim Northover <tnorthover at apple.com> wrote:

> Hi,
> 
> The attached patch adds a heuristic to ShrinkDemandedConstant so that small negative constants are preferred over large ones even if as an unsigned value the transformation would be an improvement.

This makes a lot of sense to me in principle, but as others have pointed out, an evaluation of its impact would be great.  :-)

-Chris