[PATCH] Prefer small negative constants in InstCombine

Chris Lattner clattner at apple.com
Tue Jul 2 22:10:18 PDT 2013


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



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