[PATCH] D132614: [RISCV] Apply DeMorgan's law to (and/or (xor X, 1), (xor Y, 1)) if X and Y are 0/1.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: reames, asb, luismarques.
Herald added subscribers: sunshaoce, VincentWu, luke957, StephenFan, vkmr, frasercrmck, evandro, apazos, sameer.abuasal, s.egerton, Jim, benna, psnobl, jocewei, PkmX, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar, hiraditya, arichardson.
Herald added a project: All.
craig.topper requested review of this revision.
Herald added subscribers: pcwang-thead, eopXD, MaskRay.
Herald added a project: LLVM.

This optimizes xors that appear due to legalizing setge/setle which
require an xor with 1. This reduces the number of xors and may
allow the xor to fold with a beqz or bnez.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132614

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/test/CodeGen/RISCV/setcc-logic.ll

-------------- next part --------------
A non-text attachment was scrubbed...
Name: D132614.455400.patch
Type: text/x-patch
Size: 6509 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20220824/e68647e0/attachment.bin>