[mlir][linalg] Add padding helper functions to PadTensorOp

Add helper functions to quickly check for zero low/high padding.

Differential Revision: https://reviews.llvm.org/D103781

mlir/include/mlir/Dialect/Linalg/IR/LinalgOps.td

@@ -263,6 +263,18 @@ def Linalg_PadTensorOp : Linalg_Op<"pad_tensor",
     SmallVector<OpFoldResult> getMixedHighPad() {
       return getMixedPadImpl(static_high(), high());
     }
+    // Return true if low padding is guaranteed to be 0.
+    bool hasZeroLowPad() {
+      return llvm::all_of(getMixedLowPad(), [](OpFoldResult ofr) {
+        return mlir::isEqualConstantInt(ofr, 0);
+      });
+    }
+    // Return true if high padding is guaranteed to be 0.
+    bool hasZeroHighPad() {
+      return llvm::all_of(getMixedHighPad(), [](OpFoldResult ofr) {
+        return mlir::isEqualConstantInt(ofr, 0);
+      });
+    }
   }];
 
   let builders = [