From 3f07077ff988e4ef870ce3d840391679e9acc03d Mon Sep 17 00:00:00 2001
From: Yuanqiang Liu <liuyuanqiang.yqliu@bytedance.com>
Date: Thu, 12 Sep 2024 17:04:57 +0800
Subject: [PATCH] [Torch] enhance fold of aten.alias (#3705)

---
 lib/Dialect/Torch/IR/TorchOps.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/Dialect/Torch/IR/TorchOps.cpp b/lib/Dialect/Torch/IR/TorchOps.cpp
index d49bcaac2f9c..c4223ae55524 100644
--- a/lib/Dialect/Torch/IR/TorchOps.cpp
+++ b/lib/Dialect/Torch/IR/TorchOps.cpp
@@ -3505,7 +3505,11 @@ atenBinaryFloatOperatorFoldHelper(ArrayRef<Attribute> operands,
 // AtenAliasOp
 //===----------------------------------------------------------------------===//
 
-OpFoldResult AtenAliasOp::fold(FoldAdaptor adaptor) { return getOperand(); }
+OpFoldResult AtenAliasOp::fold(FoldAdaptor adaptor) {
+  if (getOperand().getType() != getResult().getType())
+    return {};
+  return getOperand();
+}
 
 //===----------------------------------------------------------------------===//
 // AtenFloordivIntOp