[LLVMdev] BasicAA unable to analyze recursive PHI nodes

[Tobias Edler von Koch]

Hi Hal, Daniel,

On Mon, 22 Jun 2015 20:45:38 -0500 Hal Finkel <hfinkel at anl.gov> wrote:
> 
> I agree. In the mean time, let's get this committed turned off by default. Please update your patch so that the new behavior is controlled by some cl::opt that is off by default. This will give us a better way to do more-extensive benchmarking and help isolate the problems.
> 

I've updated the patch and added the flag. Is this OK to go in now?
http://reviews.llvm.org/D10368

We're seeing some small degradations on Hexagon too (and that's in
simulation, so definitely not noise). At first glance it seems that the
main difference is that some loops are being replaced by memcpy/memset
calls (you'd think that's a good thing...), but I'll investigate this
further.

Tobias

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