[PATCH] [ValueTracking] Consider the bounds of PTX special registers

[Mark Heffernan]

On Mon, Jun 16, 2014 at 12:08 PM, Mark Heffernan <meheff at google.com> wrote:

> I should also mention that I encountered some long compilation times which
> are superlinear with the unroll count when experimenting with the pragma
> loop limit.  With the current limit (32K) on a simple loop the compilation
> time is ~7s.  Doubling the limit results in a compilation time of ~50s.  It
> seems to be beneath llvm::UnrollLoop -> FoldBlockIntoPredecessor ->
> llvm::ScalarEvolution::forgetLoop.
>
> http://reviews.llvm.org/D4150


Whoops.  posted to the wrong review.  Meant to add this to
http://reviews.llvm.org/D4147.

Mark
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