[PATCH] D44098: [ARM] Relax condition for PerformSHLSimplify

Mon Mar 5 08:57:06 PST 2018

samparker created this revision.
samparker added a reviewer: john.brawn.
Herald added subscribers: kristof.beyls, javed.absar.

PerformSHLSimplify previously would be bail if one of given node's users had a shl operand because the transformation wouldn't necessarily combine the shift into the user nodes. I guess this should have also happened for other shifts too... Anyway, by removing this restriction we can still remove mov instructions or a mov is replaced by a shift, which sometimes can help register pressure.

https://reviews.llvm.org/D44098

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  test/CodeGen/ARM/load-combine-big-endian.ll
  test/CodeGen/ARM/load-combine.ll
  test/CodeGen/ARM/unfold-shifts.ll

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