[all-commits] [llvm/llvm-project] 6e2335: [DAGCombiner] Fix crash caused by illegal InterVT ...

[陈子昂 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6e23353c396098bf5cedf26091179f9d8dacb2e9
      https://github.com/llvm/llvm-project/commit/6e23353c396098bf5cedf26091179f9d8dacb2e9
  Author: 陈子昂 <2802328816 at qq.com>
  Date:   2026-02-14 (Sat, 14 Feb 2026)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/dag-stlf-mismatch.ll

  Log Message:
  -----------
  [DAGCombiner] Fix crash caused by illegal InterVT in ForwardStoreValueToDirectLoad (#181175)

This patch fixes an assertion failure in ForwardStoreValueToDirectLoad
during DAGCombine.

The crash occurs when `STLF (Store-to-Load Forwarding)` creates an
illegal intermediate bitcast type (e.g., `v128i1` when bridging a
128-bit store to a `<32 x i1>` load on X86). Since `v128i1` is not a
legal mask type for the backend, it violates the expectations of the
LegalizeDAG pass.

The fix adds a `TLI.isTypeLegal(InterVT)` check to ensure that the
intermediate type used for the transformation is supported by the
target.

Fixes #181130



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