[all-commits] [llvm/llvm-project] 0629ff: [PHIElimination] Reuse existing COPY in predecesso...

[Guy David via All-commits]

  Branch: refs/heads/users/guy-david/phi-elimination-operand-multi-use
  Home:   https://github.com/llvm/llvm-project
  Commit: 0629fffe954d6279a476d8d099565caff6135420
      https://github.com/llvm/llvm-project/commit/0629fffe954d6279a476d8d099565caff6135420
  Author: Guy David <guyda96 at gmail.com>
  Date:   2025-07-03 (Thu, 03 Jul 2025)

  Changed paths:
    M llvm/lib/CodeGen/PHIElimination.cpp
    A llvm/test/CodeGen/AArch64/PHIElimination-reuse-copy.mir
    M llvm/test/CodeGen/PowerPC/vsx.ll

  Log Message:
  -----------
  [PHIElimination] Reuse existing COPY in predecessor basic block

The insertion point of COPY isn't always optimal and could eventually
lead to a worse block layout, see the regression test.

This change affects many architectures but the amount of total
instructions in the test cases seems too be slightly lower.



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