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04715c9915
Implement a BITCAST dag combine to transform i32->mmx conversion patterns into a X86 specific node (MMX_MOVW2D) and guarantee that moves between i32 and x86mmx are better handled, i.e., don't use store-load to do the conversion.. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228293 91177308-0d34-0410-b5e6-96231b3b80d8