[PATCH] Prefer small negative constants in InstCombine

[Chris Lattner]

On Jul 2, 2013, at 5:29 AM, Tim Northover <t.p.northover at gmail.com> wrote:

>> This seems like a big change that could affect all sorts of optimizations;
>> I'd like to see performance numbers from the nightly test suite.
> 
> Just an update, it turned out to be a terrible idea. Linpack got 66% worse.

Have you analyzed why?

-Chris