On Wed, Feb 8, 2017 at 10:26 AM, Pete Heist <peteheist@gmail.com> wrote:

> Even after the new SSA back end, they can still be large.
>

​Take if from a long time compiler write who has nearly 30 years experience
working with SSA:  SSA is no panacea.  It is a representation that makes
some optimizations easier to express and sometimes more effective.  Many of
the optimizations that SSA facilitates tend to raise register pressure.  I
can be a very delicate balancing act.

Optimizing for size is a dark art.  Most compiler projects invest
relatively little effort in that direction.​

​/john​