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This patch slightly changes the algorithm introduced at revision 210477 to fix a problem where the algorithm was producing incorrect code for the VEX.256 encoded versions of horizontal add/sub. For these cases, we now try to split the two 256-bit vectors into 128-bit chunks before emitting horizontal add/sub dag nodes. Added a new test case into haddsub-2.ll. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210545 91177308-0d34-0410-b5e6-96231b3b80d8
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