[all-commits] [llvm/llvm-project] 069257: [clang][CodeGen] Fix metadata when vectorization i...

[Ryotaro Kasuga via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0692572e040979b2de0dceb8f0537aa16caf351f
      https://github.com/llvm/llvm-project/commit/0692572e040979b2de0dceb8f0537aa16caf351f
  Author: Ryotaro Kasuga <kasuga.ryotaro at fujitsu.com>
  Date:   2025-07-17 (Thu, 17 Jul 2025)

  Changed paths:
    M clang/lib/CodeGen/CGLoopInfo.cpp
    M clang/test/CodeGenCXX/pragma-loop.cpp

  Log Message:
  -----------
  [clang][CodeGen] Fix metadata when vectorization is disabled by pragma (#135163)

Currently, when specifying `vectorize(disable) unroll_count(8)`, the
generated metadata appears as follows:

```
!loop0 = !{!"loop0", !vectorize_width, !followup}
!vectorize_width = !{!"llvm.loop.vectorize.width", i32 1}
!followup = !{!"llvm.loop.vectorize.followup_all", !unroll}
!unroll = !{!"llvm.loop.unroll_count", i32 8}
```

Since the metadata `!vectorize_width` implies that the vectorization is
disabled, the vectorization process is skipped, and the `!followup`
metadata is not processed correctly.

This patch addresses the issue by directly appending properties to the
metadata node when vectorization is disabled, instead of creating a new
follow-up MDNode. In the above case, the generated metadata will now
look like this:

```
!loop0 = !{!"loop0", !vectorize_width, !vectorize_width, !unroll}
!vectorize_width = !{!"llvm.loop.vectorize.width", i32 1}
!unroll = !{!"llvm.loop.unroll_count", i32 8}
```



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