[X86] combineAddOfPMADDWD - add 256/512-bit handling
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backend:X86
missed-optimization
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- LLVM
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Description
ADD(VPMADDWD(X,Y),VPMADDWD(Z,W)) -> VPMADDWD(SHUFFLE(X,Z), SHUFFLE(Y,W))
Add v8i32 / v16i32 test coverage for the existing fold.
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