Tim Northover 23b1f08282 ARM64: optimise (cmp x, (sub 0, y)) to (cmn x, y).
This transformation is only valid when being used for an EQ or NE
comparison since the flags change otherwise.

llvm-svn: 206167
2014-04-14 12:50:47 +00:00
..
2014-02-16 07:31:05 +00:00