[all-commits] [llvm/llvm-project] ab811e: [AArch64] Fix BE popcount casts. (#129879)

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ab811e75734a77247dae6df1579fa6f29394f200
      https://github.com/llvm/llvm-project/commit/ab811e75734a77247dae6df1579fa6f29394f200
  Author: David Green <david.green at arm.com>
  Date:   2025-03-05 (Wed, 05 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/arm64-popcnt.ll
    M llvm/test/CodeGen/AArch64/parity.ll
    M llvm/test/CodeGen/AArch64/popcount.ll

  Log Message:
  -----------
  [AArch64] Fix BE popcount casts. (#129879)

A bitcast, being defined as a load and a store, can change the lane
order. We need to use a NVCAST instead to keep the lanes out of the
VADDV the same in big-endian. The extracting from a v2i64 vector is
to keep the types of the nvcast legal, but also allow us to replace a
lane mov with a mov 0.

Fixes #129843



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