[PATCH] D138888: [AArch64][SVE] Replace destructive operand of vector zeros with a bundled MOVPRFX instruction

[Allen zhong via Phabricator via llvm-commits]

Allen created this revision.
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Replace unary instructions where the destructive operand is a vector of zeros
with a bundled MOVPRFX instruction, e.g:

  Transform:
      %X0 = DUP_ZI_S 0, 0
      %X0 = FNEG_ZPmZ_S X0, P0, X2
   into:
       X0 = MOVPRFX P0/z, X0
       X0 = FNEG_ZPmZ_S X0, P0, X2
      

Depends on D105889 <https://reviews.llvm.org/D105889>


https://reviews.llvm.org/D138888

Files:
  llvm/lib/Target/AArch64/AArch64ExpandPseudoInsts.cpp
  llvm/test/CodeGen/AArch64/sve2-intrinsics-fp-int-binary-logarithm-zeroing.ll

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