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We have a number of useful lowering strategies for VBROADCAST instructions (both from memory and register element 0) which the 128-bit form of the MOVDDUP instruction can make use of. This patch tweaks lowerVectorShuffleAsBroadcast to enable it to broadcast 2f64 args using MOVDDUP as well. It does require a slight tweak to the lowerVectorShuffleAsBroadcast mechanism as the existing MOVDDUP lowering uses isShuffleEquivalent which can match binary shuffles that can lower to (unary) broadcasts. Differential Revision: http://reviews.llvm.org/D17680 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@262478 91177308-0d34-0410-b5e6-96231b3b80d8
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