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Author SHA1 Message Date
James Molloy 37593732a4 Don't create a MIN/MAX node if the underlying compare has more than one use. 
If the compare in a select pattern has another use then it can't be removed, so we'd just
be creating repeated code if we created a min/max node.

Spotted by Matt Arsenault!

llvm-svn: 239037
 2015-06-04 13:48:23 +00:00
James Molloy cfb0443af6 Mark SMIN/SMAX/UMIN/UMAX nodes as legal and add patterns for them. 
The new [SU]{MIN,MAX} SDNodes can be lowered directly to instructions for
most NEON datatypes - the big exclusion being v2i64.

llvm-svn: 237455
 2015-05-15 16:15:57 +00:00