[all-commits] [llvm/llvm-project] b46904: [CIR][AArch64] Lower NEON vzip intrinsics (#193658)

[Jiahao Guo via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b46904a0326ac685e970b1a8a3f576b865098763
      https://github.com/llvm/llvm-project/commit/b46904a0326ac685e970b1a8a3f576b865098763
  Author: Jiahao Guo <eoonguo at gmail.com>
  Date:   2026-04-29 (Wed, 29 Apr 2026)

  Changed paths:
    M clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp
    M clang/test/CodeGen/AArch64/fp8-intrinsics/acle_neon_fp8_untyped.c
    M clang/test/CodeGen/AArch64/neon-perm.c
    M clang/test/CodeGen/AArch64/neon/perm.c

  Log Message:
  -----------
  [CIR][AArch64] Lower NEON vzip intrinsics (#193658)

### Summary

part of https://github.com/llvm/llvm-project/issues/185382

lower part of intrinsics in :
https://arm-software.github.io/acle/neon_intrinsics/advsimd.html#zip-elements

Lower NEON::BI__builtin_neon_vzip_v and NEON::BI__builtin_neon_vzipq_v
in CIRGenBuiltinAArch64.cpp by porting the existing incubator logic
(`clangir/clang/lib/CIR/CodeGen/CIRGenBuiltinAArch64.cpp`) onto ClangIR:
two bitcasts on the input vectors, two rounds of cir.vec.shuffle
generating the low/high interleave patterns, each stored through a
ptr_stride of the sret base pointer.

### Test
- test_vzip_mf8
- test_vzipq_mf8

I found that these two intrinsics are defined in
`llvm-project/clang/test/CodeGen/AArch64/fp8-intrinsics/acle_neon_fp8_untyped.c`,
but this file seems to be a test suite specifically for the `mfloat8`
type, so I did not remove their original test cases.

Some of the new CHECK lines additionally match a pair of bitcasts before
the shuffle; this shape comes from arm_neon.h's inline wrappers, which
re-cast typed vectors (e.g. <4 x i16>) through <8 x i8> before calling
__builtin_neon_vzip_v. Variants whose element type is already i8
(s8/u8/p8/mf8) skip that round-trip and therefore have no bitcasts in
the check lines.



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