regression on Adobe-C++/loop_unroll

[Evan Cheng]

Do you have more detailed information on how this change is causing performance regression?

Evan

On Feb 6, 2014, at 11:19 AM, Gerolf Hoflehner <ghoflehner at apple.com> wrote:

> Hi Chandler
> 
> your commit seems to cause a major regression (>20%)  on loop_unroll and other benchmarks as well. This is ( at least)  on x86 under -O3 -flto and seems to be due to the loss of LICM. Please take a look.
> 
> Cheers
> Gerolf
> 
> ------------------------------------------------------------------------
> r200067 | chandlerc | 2014-01-24 20:07:24 -0800 (Fri, 24 Jan 2014) | 44 lines
> 
> [LPM] Make LCSSA a utility with a FunctionPass that applies it to all
> the loops in a function, and teach LICM to work in the presance of
> LCSSA.
> 
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