[PATCH] D128426: [AArch64] Convert vector add(ext, ext) into ext(add(ext, ext))

[Dave Green via Phabricator via llvm-commits]

dmgreen created this revision.
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Given a vector add or sub from extends that needs more that one 'step' (i.e i8 to i32 or i16 to i64), we can transform the sequence to `sext(add(ext, ext))`, to allow the `add(ext, ext)` to become a single uaddl and a larger extend, producing less instructions in total.
https://alive2.llvm.org/ce/z/S2T4k-


https://reviews.llvm.org/D128426

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/insert-extend.ll
  llvm/test/CodeGen/AArch64/neon-extadd.ll
  llvm/test/CodeGen/AArch64/reduce-shuffle.ll

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