Tim Northover 52aa80b068 ARM: add patterns for [su]xta[bh] from just a shift.
Although the final shifter operand is a rotate, this actually only matters for
the half-word extends when the amount == 24. Otherwise folding a shift in is
just as good.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213753 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-23 13:59:07 +00:00
..
2014-06-24 15:45:59 +00:00