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4 Commits

Author SHA1 Message Date
Sanjay Patel 8ca30ab0c5 [InstSimplify] allow integer vector types to use computeKnownBits 
Note that the non-splat lshr+lshr test folded, but that does not
work in general. Something is missing or wrong in computeKnownBits
as the non-splat shl+shl test still shows.

llvm-svn: 288005
 2016-11-27 21:07:28 +00:00
Sanjay Patel dc2917b969 add tests to show missing analysis; NFC 
llvm-svn: 287998
 2016-11-27 15:54:45 +00:00
Sanjay Patel e104a5f35a auto-generate checks 
llvm-svn: 281756
 2016-09-16 17:54:52 +00:00
James Molloy b6be1ebb7d [ValueTracking] Teach isKnownNonZero a new trick 
If the shifter operand is a constant, and all of the bits shifted out
are known to be zero, then if X is known non-zero at least one
non-zero bit must remain.

llvm-svn: 248508
 2015-09-24 16:06:32 +00:00