[llvm] r229731 - Partial fix for bug 22589

[Hans Wennborg]

On Wed, Feb 18, 2015 at 11:32 AM, Sanjoy Das
<sanjoy at playingwithpointers.com> wrote:
> Author: sanjoy
> Date: Wed Feb 18 13:32:25 2015
> New Revision: 229731
>
> URL: http://llvm.org/viewvc/llvm-project?rev=229731&view=rev
> Log:
> Partial fix for bug 22589
>
> Don't spend the entire iteration space in the scalar loop prologue if
> computing the trip count overflows.  This change also gets rid of the
> backedge check in the prologue loop and the extra check for
> overflowing trip-count.
>
> Differential Revision: http://reviews.llvm.org/D7715

Merged to 3.6 in r229757.

Thanks,
Hans