[all-commits] [llvm/llvm-project] e413f6: [LoongArch] Propagate demanded bits for CRC[C].W.{...

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  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e413f6e780a932606b0ba48d7bf61ba5724c48b8
      https://github.com/llvm/llvm-project/commit/e413f6e780a932606b0ba48d7bf61ba5724c48b8
  Author: hev <wangrui at loongson.cn>
  Date:   2026-06-15 (Mon, 15 Jun 2026)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/test/CodeGen/LoongArch/crc.ll

  Log Message:
  -----------
  [LoongArch] Propagate demanded bits for CRC[C].W.{B,H}.W (#203201)

CRC byte and halfword instructions only use the low 8 or 16 bits of
their data operand. Propagate these demanded-bit requirements through
SimplifyDemandedBitsForTargetNode() so redundant masking operations can
be removed during DAG combining.



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