Tim Northover 170daafe01 ARM: use LLVM IR to represent the vshrn operation ...

vshrn is just the combination of a right shift and a truncate (and the limits
on the immediate value actually mean the signedness of the shift doesn't
matter). Using that representation allows us to get rid of an ARM-specific
intrinsic, share more code with AArch64 and hopefully get better code out of
the mid-end optimisers.

llvm-svn: 201085

2014-02-10 14:04:07 +00:00

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