[PATCH] D135441: [AArch64][SelectionDAG] Lower multiplication by a constant to shl+add+shl+add

[Allen zhong via Phabricator via llvm-commits]

Allen created this revision.
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Change the costmodel to lower a = b * C where C = (1 + 2^m) * (1 + 2^n) to

  add   w8, w0, w0, lsl #m
  add   w0, w8, w8, lsl #n


https://reviews.llvm.org/D135441

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/arm64-popcnt.ll
  llvm/test/CodeGen/AArch64/memset-inline.ll
  llvm/test/CodeGen/AArch64/mul_pow2.ll

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