[PATCH] D59355: [RISCV] Optimize emission of SELECT sequences

[Luís Marques via Phabricator via llvm-commits]

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

This patch optimizes the emission of a sequence of SELECTs with the same 
condition, avoiding the insertion of unnecessary control flow. We have 
identified several use cases where the SELECTs could be interleaved with other 
instructions. Therefore, we extend the sequence to include non-SELECT 
instructions if we are able to detect that the non-SELECT instructions do not 
impact the optimization.


Repository:
  rL LLVM

https://reviews.llvm.org/D59355

Files:
  lib/Target/RISCV/RISCVISelLowering.cpp
  test/CodeGen/RISCV/atomic-rmw.ll
  test/CodeGen/RISCV/select-optimize-multiple.ll
  test/CodeGen/RISCV/select-optimize-multiple.mir

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