From d01daf2396a5affe8e7e2dc6be421958f4e714cf Mon Sep 17 00:00:00 2001
From: Kai Sasaki <lewuathe@gmail.com>
Date: Thu, 27 Feb 2025 14:54:25 +0900
Subject: [PATCH] [mlir][math] Rsqrt math expand pass expects static shaped
 operand

Similar to the issue reported in
https://github.com/llvm/llvm-project/pull/128299/files, ExpandMath
pattern for rsqrt expects the static shaped operands. Otherwise, it
crashes due to the assertion violation.
---
 .../Math/Transforms/ExpandPatterns.cpp        |  5 ++++
 mlir/test/Dialect/Math/expand-math.mlir       | 26 +++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp b/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp
index bb592c667549c..7b5350ca26b60 100644
--- a/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp
+++ b/mlir/lib/Dialect/Math/Transforms/ExpandPatterns.cpp
@@ -646,6 +646,11 @@ static LogicalResult convertRsqrtOp(math::RsqrtOp op,
 
   auto operand = op.getOperand();
   auto operandTy = operand.getType();
+  // Operand type must be shatic shaped type to create const float.
+  auto shapedOperandType = dyn_cast<ShapedType>(operandTy);
+  if (shapedOperandType && !shapedOperandType.hasStaticShape())
+    return failure();
+
   auto eTy = getElementTypeOrSelf(operandTy);
   if (!isa<FloatType>(eTy))
     return failure();
diff --git a/mlir/test/Dialect/Math/expand-math.mlir b/mlir/test/Dialect/Math/expand-math.mlir
index 946a411e4cc4b..1420acaa40d35 100644
--- a/mlir/test/Dialect/Math/expand-math.mlir
+++ b/mlir/test/Dialect/Math/expand-math.mlir
@@ -787,3 +787,29 @@ func.func @unranked_ceil_op(%arg: tensor<*xf32>) -> tensor<*xf32>{
   %a = math.ceil %arg : tensor<*xf32>
   return %a: tensor<*xf32>
 }
+
+// -----
+
+// CHECK-LABEL:    func.func @non_static_shape_rsqrt_op
+// CHECK-SAME:     (%[[ARG:.*]]: tensor<?xf32>)
+// CHECK-SAME:     -> tensor<?xf32>
+// CHECK:          %[[RSQRT:.*]] = math.rsqrt %[[ARG]] : tensor<?xf32>
+// CHECK:          return %[[RSQRT]] : tensor<?xf32>
+
+func.func @non_static_shape_rsqrt_op(%arg: tensor<?xf32>) -> tensor<?xf32>{
+  %a = math.rsqrt %arg : tensor<?xf32>
+  return %a: tensor<?xf32>
+}
+
+// -----
+
+// CHECK-LABEL:    func.func @unranked_rsqrt_op
+// CHECK-SAME:     (%[[ARG:.*]]: tensor<*xf32>)
+// CHECK-SAME:     -> tensor<*xf32>
+// CHECK:          %[[RSQRT:.*]] = math.rsqrt %[[ARG]] : tensor<*xf32>
+// CHECK:          return %[[RSQRT]] : tensor<*xf32>
+
+func.func @unranked_rsqrt_op(%arg: tensor<*xf32>) -> tensor<*xf32>{
+  %a = math.rsqrt %arg : tensor<*xf32>
+  return %a: tensor<*xf32>
+}