[PATCH] D143107: [SPIR-V] Emit spv_undef intrinsic for aggregate undef operands

[Michal Paszkowski via Phabricator via llvm-commits]

mpaszkowski created this revision.
mpaszkowski added reviewers: iliya-diyachkov, konrad.trifunovic, zuban32, arsenm, rengolin, MaskRay, andreytr.
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.

This change adds a new spv_undef intrinsic which is emitted in place of aggregate undef operands and later selected to single OpUndef SPIR-V instruction. The behavior matches that of Khronos SPIR-V Translator and should support nested aggregates.

This is an alternative better approach to the one discussed in https://reviews.llvm.org/D141337.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143107

Files:
  llvm/include/llvm/IR/IntrinsicsSPIRV.td
  llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
  llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
  llvm/test/CodeGen/SPIRV/instructions/undef-nested-composite-store.ll
  llvm/test/CodeGen/SPIRV/instructions/undef-simple-composite-store.ll

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