[Mlir-commits] [mlir] [mlir][bufferization] `MaterializeInDestinationOp`: Support memref destinations (PR #68074)

[Matthias Springer]

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@@ -361,10 +399,15 @@ def Bufferization_ToTensorOp : Bufferization_Op<"to_tensor", [
     thereof) will bufferize out-of-place to prevent emitting any writes to
     `memref` during bufferization.
 
-    If the given memref does not alias with any other memref passed to another
-    `to_tensor` op, the `restrict` unit attribute can be set. Only such
-    operations are supported by One-Shot Bufferize. (Otherwise, potential memref
-    aliasing relationships would have to be captured in One-Shot Bufferize.)
+    The `restrict` unit attribute (similar to the C `restrict` keyword)
+    indicates that the produced tensor result is the only way for the tensor
+    IR to gain access to the `memref` operand (or an alias thereof). E.g.,
+    there must be no other `to_tensor` op with the same or with an aliasing
+    `memref` operand.
+
+    Note: Only `to_tensor` ops with the `restrict` unit attribute are supported
+    by One-Shot Bufferize. Other IR is rejected. (To support `to_tensor`
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matthias-springer wrote:

Added this sentence here and at ToTensorOp:
`Ops that have incorrect usage of restrict may bufferize incorrectly.`

https://github.com/llvm/llvm-project/pull/68074