[Mlir-commits] [mlir] [llvm] [lldb] [mlir] Introduce replaceWithZeroTripCheck in LoopLikeOpInterface (PR #80331)

[Jerry Wu]

================
@@ -220,6 +220,31 @@ def LoopLikeOpInterface : OpInterface<"LoopLikeOpInterface"> {
       /*defaultImplementation=*/[{
         return ::mlir::failure();
       }]
+    >,
+    InterfaceMethod<[{
+        Add a zero-trip-check around the loop to check if the loop body is ever
+        run and return the new loop inside the check. The loop body is moved
+        over to the new loop. Returns "failure" if the loop doesn't support
+        this transformation.
+
+        After the transformation, the ops inserted to the parent region of the
+        loop are guaranteed to be run only if the loop body runs at least one
+        iteration.
+
+        Note: Ops in the loop body might be rearranged because of loop rotating
+        to maintain the semantic. Terminators might be removed/added during this
+        transformation. Also callers are not required to check the side-effect
+        of loop condition, so the transformation needs to consider that to make
+        sure the loop behavior is unchanged when moving the condtion out of the
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pzread wrote:

Fixed.

https://github.com/llvm/llvm-project/pull/80331