[tosa] aten.transpose.int support (#1017)

Signed-off-by: Suraj Sudhir <suraj.sudhir@arm.com>

e2e_testing/torchscript/xfail_sets.py

@@ -169,4 +169,7 @@ TOSA_PASS_SET = {
     "NumpyTRankNStaticModule_basic",
     "NumpyTRankNDynamicModule_basic",
     "EmbeddingModuleI32Static_basic",
+    "TModuleRank2_basic",
+    "TransposeIntModule_basic",
+    "TransposeIntNegDimsModule_basic",
 }

lib/Conversion/TorchToTosa/TorchToTosa.cpp

@@ -2705,6 +2705,47 @@ LogicalResult ConvertAtenOp<AtenEmbeddingOp>::matchAndRewrite(
   return success();
 }
 
+template <>
+LogicalResult ConvertAtenOp<AtenTransposeIntOp>::matchAndRewrite(
+    AtenTransposeIntOp op, OpAdaptor adaptor,
+    ConversionPatternRewriter &rewriter) const {
+
+  auto selfType = adaptor.self().getType().dyn_cast<TensorType>();
+  if (!selfType)
+    return op.emitError("Only tensor types are supported");
+
+  // Only statically resolvable values are currently supported
+  int64_t dim0, dim1;
+  if (!matchPattern(op.dim0(), m_TorchConstantInt(&dim0)))
+    return op->emitError("dim0 must be a Scalar constant");
+
+  if (!matchPattern(op.dim1(), m_TorchConstantInt(&dim1)))
+    return op->emitError("dim1 must be a Scalar constant");
+
+  dim0 = toPositiveDim(dim0, selfType.getRank());
+  dim1 = toPositiveDim(dim1, selfType.getRank());
+
+  auto selfRank = selfType.getRank();
+  if (!isValidDim(dim0, selfRank) || !isValidDim(dim1, selfRank))
+    return op->emitError("dim0 and dim1 must be less than tensor rank");
+
+  SmallVector<int32_t> transposeDims;
+  for (auto i = 0; i < selfType.getRank(); ++i)
+    transposeDims.push_back(i);
+
+  transposeDims[dim0] = dim1;
+  transposeDims[dim1] = dim0;
+
+  auto transposeDimsConst = mlir::tosa::getConstTensor<int32_t>(
+      rewriter, op.getOperation(), transposeDims, {selfType.getRank()});
+
+  rewriter.replaceOpWithNewOp<tosa::TransposeOp>(
+      op, getTypeConverter()->convertType(op.getType()), adaptor.self(),
+      transposeDimsConst.getValue());
+
+  return success();
+}
+
 template <typename AtenOpT, typename TosaOpT>
 class ConvertAtenPoolingBaseOp : public OpConversionPattern<AtenOpT> {
 public:
@@ -3314,6 +3355,7 @@ public:
     INSERT_ATENOP_PATTERN(AtenGeluOp);
     INSERT_ATENOP_PATTERN(AtenGeluBackwardOp);
     INSERT_ATENOP_PATTERN(AtenEmbeddingOp);
+    INSERT_ATENOP_PATTERN(AtenTransposeIntOp);
 #undef INSERT_ATENOP_PATTERN
 
     if (failed(applyPartialConversion(getOperation(), target,