[all-commits] [llvm/llvm-project] 9c2921: [SPIR-V] Ensure that cleaning of temporary constan...

[Vyacheslav Levytskyy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9c29217a170566890d76b56ccfbbf9ceaa1193ab
      https://github.com/llvm/llvm-project/commit/9c29217a170566890d76b56ccfbbf9ceaa1193ab
  Author: Vyacheslav Levytskyy <vyacheslav.levytskyy at intel.com>
  Date:   2024-06-13 (Thu, 13 Jun 2024)

  Changed paths:
    M llvm/lib/Target/SPIRV/SPIRVPreLegalizer.cpp
    A llvm/test/CodeGen/SPIRV/keep-tracked-const.ll

  Log Message:
  -----------
  [SPIR-V] Ensure that cleaning of temporary constants doesn't purge tracked constants (#95303)

This PR fixes a problem in logics of cleaning unused constants, ensuring
that cleaning of temporary constants doesn't purge tracked constants. On
a rare occasion when this happens SPIR-V Backend emits a code that
refers to a non-existent register, earlier related with a constant.
Attached to the PR test case is a minimal reproducer where names of
variables and instructions lead to such a rare coincidence.



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