[PPC] Add an option to disable isel

[Hal Finkel]

Hi Olivier,

I apologize for the delay. LGTM.

 -Hal

----- Original Message -----
> From: "Olivier H Sallenave" <ohsallen at us.ibm.com>
> To: cfe-commits at cs.uiuc.edu
> Cc: "Hal J. Finkel" <hfinkel at anl.gov>
> Sent: Thursday, March 26, 2015 9:22:56 AM
> Subject: [PPC] Add an option to disable isel
> 
> 
> 
> Hi,
> 
> As explained in http://reviews.llvm.org/D8260 , using branches can
> give speedups compared to using isel on P7 and P8. This patch adds
> the -misel/-mno-isel option so that the user can tune its
> application. -misel is the default.
> 
> (See attached file: clang-isel.diff)
> 
> Thanks,
> Olivier

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory