[PATCH] D134881: [RISCV] Branchless lowering for select (and (x , 0x1) == 0), y, (z ^ y) ) and select (and (x , 0x1) == 0), y, (z | y) )

[Philip Reames via Phabricator via llvm-commits]

reames updated this revision to Diff 463952.
reames added a comment.

Restructure as a post-legalize combine on SELECT_CC.  Doing this as a combine on SETCC before legalization turns out to be annoying as the forms for the inverse icmp looks very different in the DAG (select vs setcc, swapped operands, and a truncate instead of an and).


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D134881/new/

https://reviews.llvm.org/D134881

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/select.ll

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