[all-commits] [llvm/llvm-project] 6ae658: [CodeGen] Finish untangling LRE::scanRemattable [n...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6ae658308919e1c01cb4221f8cd07365c7ce6fc2
      https://github.com/llvm/llvm-project/commit/6ae658308919e1c01cb4221f8cd07365c7ce6fc2
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2025-10-07 (Tue, 07 Oct 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/LiveRangeEdit.h
    M llvm/lib/CodeGen/InlineSpiller.cpp
    M llvm/lib/CodeGen/LiveRangeEdit.cpp
    M llvm/lib/CodeGen/SplitKit.cpp

  Log Message:
  -----------
  [CodeGen] Finish untangling LRE::scanRemattable [nfc] (#161963)

This is an attempt to simplify the rematerialization logic in
InlineSpiller and SplitKit. I'd earlier done the same for
RegisterCoalescer in 57b673.

The basic idea of this change is that we don't need to check whether an
instruction is rematerializable early. Instead, we can defer the check
to the point where we're actually trying to materialize something. We
also don't need to indirect that query through a VNI key, and can
instead just check the instruction directly at the use site.



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