[all-commits] [llvm/llvm-project] 3bb92b: [SandboxVec] Tag insts in a Region with metadata. ...

[Jorge Gorbe Moya via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3bb92b530f27166b9037b63568534d248ff80150
      https://github.com/llvm/llvm-project/commit/3bb92b530f27166b9037b63568534d248ff80150
  Author: Jorge Gorbe Moya <jgorbe at google.com>
  Date:   2024-09-23 (Mon, 23 Sep 2024)

  Changed paths:
    M llvm/include/llvm/SandboxIR/SandboxIR.h
    M llvm/include/llvm/Transforms/Vectorize/SandboxVectorizer/Region.h
    M llvm/lib/Transforms/Vectorize/SandboxVectorizer/Region.cpp
    M llvm/unittests/Transforms/Vectorize/SandboxVectorizer/RegionTest.cpp

  Log Message:
  -----------
  [SandboxVec] Tag insts in a Region with metadata. (#109353)

For each region, we create a metadata node. Then when an instruction is
added to the Region, it gets tagged with the metadata node for that
region. In the following example, we have a Region that contains only
the `%t0` instruction.

```
define i8 @foo(i8 %v0, i8 %v1) {
  %t0 = add i8 %v0, 1, !sbvec !0
  %t1 = add i8 %t0, %v1
  ret i8 %t1
}

!0 = distinct !{!"region"}
```

This commit also adds a function to create regions from metadata already
present in a Function.

This metadata can be used for debugging: if we dump IR before a Region
pass, the IR will contain enough info to re-create the Region and run
the pass by itself in a later invocation.

---------

Co-authored-by: Alina Sbirlea <alina.g.simion at gmail.com>



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