[all-commits] [llvm/llvm-project] 4b66c9: [SDPatternMatch] Remove MatchContext. NFC (#218372)

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4b66c9678662933ff13f8362e3a208cbe6284808
      https://github.com/llvm/llvm-project/commit/4b66c9678662933ff13f8362e3a208cbe6284808
  Author: Luke Lau <luke at igalia.com>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M llvm/include/llvm/CodeGen/SDPatternMatch.h
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/unittests/CodeGen/SelectionDAGPatternMatchTest.cpp

  Log Message:
  -----------
  [SDPatternMatch] Remove MatchContext. NFC (#218372)

This removes the match context templating now that trivial VP nodes are
gone.

`m_Negative` and the other computeKnownBits matchers previously used the
DAG within the match context. But they're now unused after #220527, so
this removes them. Since computeKnownBits is an expensive operation, any
combines in future that need to check the sign should likely call
computeKnownBits outside of the pattern match



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