[PATCH] D146923: [SPIR-V] Remove switch G_ICMP+G_BRCOND+G_BR before ISel

[Michal Paszkowski via Phabricator via llvm-commits]

mpaszkowski created this revision.
mpaszkowski added reviewers: iliya-diyachkov, zuban32, konrad.trifunovic, rengolin, arsenm.
Herald added subscribers: ThomasRaoux, hiraditya.
Herald added a project: All.
mpaszkowski requested review of this revision.
Herald added subscribers: llvm-commits, wdng.
Herald added a project: LLVM.

IRTranslator lowers switches to [G_SUB] + G_ICMP + G_BRCOND + G_BR sequences. Since values and destination MBBs are included in the spv_switch intrinsics, the sequences are not needed for ISel.

Before this patch, the information decoded by these sequences were added to spv_switch intrinsics in SPIRVPreLegalizer and the sequences were kept until SPIRVModuleAnalysis where they were marked skipped for emission.

After this patch, the [G_SUB] + G_ICMP + G_BRCOND + G_BR sequences and MBBs containing only these MIs are erased in SPIRVPreLegalizer.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146923

Files:
  llvm/lib/Target/SPIRV/SPIRVAsmPrinter.cpp
  llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp
  llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.h
  llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp

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