[LLVMdev] GVNPRE removed from main line?

[Owen Anderson]

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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