[PATCH] D30827: [mips][msa] Prevent output operand from commuting for dpadd_[su].df instructions

[Stefan Maksimovic via Phabricator via llvm-commits]

smaksimovic updated this revision to Diff 92146.
smaksimovic retitled this revision from "[mips][msa] Disable commutativity for dpadd_[su].df instructions" to "[mips][msa] Prevent output operand from commuting for dpadd_[su].df instructions".
smaksimovic added a comment.

Hi Simon,

As per your suggestion, we've taken a look at TargetInstrInfo::commuteInstructionImpl and ended up reimplementing TargetInstrInfo::findCommutedOpIndices
for the MIPS target and handled our instructions there, keeping the isCommutable flag in the .td file.

The latter function is being called prior to the former, setting its parameters accordingly.


https://reviews.llvm.org/D30827

Files:
  lib/Target/Mips/MipsInstrInfo.cpp
  lib/Target/Mips/MipsInstrInfo.h
  test/CodeGen/Mips/msa/3r_4r_widen.ll

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