[PATCH] D22908: [ARM] Improve isel of smul and smla instructions for thumb2

[Sam Parker via llvm-commits]

samparker created this revision.
samparker added a subscriber: llvm-commits.
Herald added subscribers: samparker, rengolin, aemerson.

Added (ashr (shl x, 16), 16) pattern to the sext_16_node patleaf which allowed some removal of some pattern for ARM and enabled more simple matching for their thumb counterparts. Updated the smul test with more patterns and thumb targets.

https://reviews.llvm.org/D22908

Files:
  lib/Target/ARM/ARMInstrFormats.td
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb2.td
  test/CodeGen/ARM/smul.ll

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