[all-commits] [llvm/llvm-project] 1f681b: [CodeGen] Clear InitUndef pass new register cache ...

[Joe Faulls via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 1f681b5913f9169332e4126ac0aafeedc5ca6cef
      https://github.com/llvm/llvm-project/commit/1f681b5913f9169332e4126ac0aafeedc5ca6cef
  Author: Joe Faulls <67795994+joe-img at users.noreply.github.com>
  Date:   2024-10-01 (Tue, 01 Oct 2024)

  Changed paths:
    M llvm/lib/CodeGen/InitUndef.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-buildvec-of-binop.ll
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-masked-gather.ll
    M llvm/test/CodeGen/RISCV/rvv/shuffle-reverse.ll

  Log Message:
  -----------
  [CodeGen] Clear InitUndef pass new register cache between pass runs (#90967)

Multiple invocations of the pass could interfere with eachother,
preventing some undefs being initialised.

I found it very difficult to create a unit test for this due to it being
dependent on particular allocations of a previous function. However, the
bug can be observed here: https://godbolt.org/z/7xnMo41Gv with the
creation of the illegal instruction `vnsrl.wi v9, v8, 0`



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