[Mlir-commits] [mlir] [mlir][vector] Add alignment attribute to vector operations. (PR #152507)

[Mehdi Amini]

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@@ -2166,6 +2189,11 @@ def Vector_ScatterOp :
     correspond to those of the `llvm.masked.scatter`
     [intrinsic](https://llvm.org/docs/LangRef.html#llvm-masked-scatter-intrinsics).
 
+    An optional `alignment` attribute allows to specify the byte alignment of the
+    scatter operation. It must be a positive power of 2. The operation must access
+    memory at an address aligned to this boundary. Violations may lead to
+    architecture-specific faults or performance penalties.
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joker-eph wrote:

I checked LLVM and that seems like what we expect:
> It is the responsibility of the code emitter to ensure that the alignment information is correct. Overestimating the alignment results in undefined behavior. Underestimating the alignment may produce less efficient code. An alignment of 1 is always safe. 

https://github.com/llvm/llvm-project/pull/152507