[all-commits] [llvm/llvm-project] 9796b0: Add support for the 'freeze' instruction (#82979)

[Vyacheslav Levytskyy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9796b0e9f91bc8ff00d2616fa3656e1ca848c05c
      https://github.com/llvm/llvm-project/commit/9796b0e9f91bc8ff00d2616fa3656e1ca848c05c
  Author: Vyacheslav Levytskyy <89994100+VyacheslavLevytskyy at users.noreply.github.com>
  Date:   2024-02-27 (Tue, 27 Feb 2024)

  Changed paths:
    M llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
    M llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
    A llvm/test/CodeGen/SPIRV/freeze.ll

  Log Message:
  -----------
  Add support for the 'freeze' instruction (#82979)

This PR is to add support for the 'freeze' instruction:
https://llvm.org/docs/LangRef.html#freeze-instruction

There is no way to implement `freeze` correctly without support on
SPIR-V standard side, but we may at least address a simple (static) case
when undef/poison value presence is obvious. The main benefit of even
incomplete `freeze` support is preventing of translation from crashing
due to lack of support on legalization and instruction selection steps.



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