[all-commits] [llvm/llvm-project] e098f6: [AArch64] Only apply bool vector bitcast opt if re...

[Nikita Popov via All-commits]

  Branch: refs/heads/release/18.x
  Home:   https://github.com/llvm/llvm-project
  Commit: e098f6c4aaccec326a2fc4b45323b3822e02c270
      https://github.com/llvm/llvm-project/commit/e098f6c4aaccec326a2fc4b45323b3822e02c270
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-02-16 (Fri, 16 Feb 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/vec-combine-compare-to-bitmask.ll

  Log Message:
  -----------
  [AArch64] Only apply bool vector bitcast opt if result is scalar (#81256)

This optimization tries to optimize bitcasts from `<N x i1>` to iN, but
currently also triggers for `<N x i1>` to `<M x iK>` bitcasts, if custom
lowering has been requested for these for an unrelated reason. Fix this
by explicitly checking that the result type is scalar.

Fixes https://github.com/llvm/llvm-project/issues/81216.

(cherry picked from commit 92d79922051f732560acf3791b543df1e6580689)