[PATCH] D59699: [RISCV] Optimize selection of fcmp one and fcmp ord

[Luís Marques via Phabricator via llvm-commits]

luismarques created this revision.
luismarques added reviewers: asb, apazos, rogfer01.
Herald added subscribers: llvm-commits, benna, psnobl, jocewei, PkmX, rkruppe, the_o, brucehoult, MartinMosbeck, edward-jones, zzheng, jrtc27, shiva0217, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar.
Herald added a project: LLVM.

The lowerings of `fcmp one` and `fcmp ord` do a negation (xor 1) of a setuo 
result. The RISC-V expansion of setuo also includes a negation. Therefore, we 
were emitting an unnecessary double negation. This patch adds a pattern (xor 
(setuo ...), 1) that avoids emitting the double negation.


Repository:
  rL LLVM

https://reviews.llvm.org/D59699

Files:
  lib/Target/RISCV/RISCVInstrInfoD.td
  lib/Target/RISCV/RISCVInstrInfoF.td
  test/CodeGen/RISCV/double-br-fcmp.ll
  test/CodeGen/RISCV/double-fcmp.ll
  test/CodeGen/RISCV/double-select-fcmp.ll
  test/CodeGen/RISCV/float-br-fcmp.ll
  test/CodeGen/RISCV/float-fcmp.ll
  test/CodeGen/RISCV/float-select-fcmp.ll

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