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Author SHA1 Message Date
Sanjay Patel 5369775a84 [InstSimplify] fixed (?) to not mutate icmps 
As Eli noted in the post-commit thread for r288833, the use of
swapOperands() may not be allowed in InstSimplify, so I'm 
removing those calls here pending further review. 

The swap mutates the icmp, and there doesn't appear to be precedent
for instruction mutation in InstSimplify.

I didn't actually have any tests for those cases, so I'm adding
a few here. 

llvm-svn: 288855
 2016-12-06 22:09:52 +00:00
Sanjay Patel 9b1b2de348 [InstSimplify] add folds for and-of-icmps with same operands 
All of these (and a few more) are already handled by InstCombine,
but we shouldn't have to wait until then to simplify these because
they're cheap to deal with here in InstSimplify.

This is the 'and' sibling of the earlier 'or' patch:
https://reviews.llvm.org/rL288833

llvm-svn: 288841
 2016-12-06 19:05:46 +00:00
Sanjay Patel 827414876f [InstSimplify] add tests for and-of-icmps; NFC 
llvm-svn: 288837
 2016-12-06 18:46:54 +00:00