[llvm] r274098 - [ValueTracking] Teach computeKnownBits for PHI nodes to compute sign bit for a recurrence with a NSW addition.

[Sanjoy Das via llvm-commits]

On Tue, Jun 28, 2016 at 10:55 PM, Craig Topper <craig.topper at gmail.com> wrote:
> Early on in the pipeline my change caused a zext to feed the getelementptrs
> instead of a sext. Later in Induction Variable Simplification a trunc was
> added in front of the zext. Where as before the sext was completely removed.

Do you have the IR before indvars was run?

-- Sanjoy