llvm dev - Nov 2009 - [LLVMdev] GVNPRE removed from main line?

It seems the GVNPRE pass has been removed from the main trunk, though
it is present in the 2.6 release. From the llvm-commits archive, I
found that it was removed  with this checkin:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090928/088214.html

"remove the GVNPRE pass.  It has been subsumed by the GVN pass."

Does the GVN pass optimize all the partial redundancies that were
caught by the GVNPRE pass?

Thanks,
-Jaydeep

On Nov 16, 2009, at 6:23 PM, Jaydeep Marathe wrote:
> It seems the GVNPRE pass has been removed from the main trunk, though
> it is present in the 2.6 release. From the llvm-commits archive, I
> found that it was removed  with this checkin:
>
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20090928/088214.html
> 
> "remove the GVNPRE pass.  It has been subsumed by the GVN pass."
> 
> Does the GVN pass optimize all the partial redundancies that were
> caught by the GVNPRE pass?
No, but GVNPRE was quite slow, had some known bugs, and had not been maintained
in a long time.

--Owen
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