[mlir][tosa] Fix lowering of tosa.conv2d

The lowering of tosa.conv2d produces an illegal tensor.empty operation
where the number of inputs do not match the number of dynamic dimensions
in the output type.

The fix is to base the generation of tensor.dim operations off the
result type of the conv2d operation, rather than the input type.
The problem and fix are very similar to this fix

#72724

but for convolution.

Author: sabauma

mlir/lib/Conversion/TosaToLinalg/TosaToLinalgNamed.cpp

@@ -136,7 +136,7 @@ static SmallVector<Value> inferDynamicDimsForConv(
   for (uint32_t i = 0, s = inputSizeDims.size(); i < s; ++i) {
     int64_t inputDim = inputSizeDims[i];
     int64_t kernelDim = kernelSizeDims[i];
-    if (inputTy.isDynamicDim(inputDim)) {
+    if (resultTy.isDynamicDim(inputDim)) {
       auto padTop = padAttr[i * 2];
       auto padBottom = padAttr[i * 2 + 1];
       auto stride = strideAttr[i];
@@ -153,7 +153,7 @@ static SmallVector<Value> inferDynamicDimsForConv(
 
   // Get the batch/channels dimensions.
   for (int i = 0; i < inputRank; i++) {
-    if (inputTy.isDynamicDim(i) && !dynDims[i])
+    if (resultTy.isDynamicDim(i) && !dynDims[i])
       dynDims[i] = rewriter.create<tensor::DimOp>(loc, input, i);
   }
 

mlir/test/Conversion/TosaToLinalg/tosa-to-linalg-named.mlir

@@ -497,6 +497,29 @@ func.func @conv2d_dyn_w_h(%input: tensor<1x?x?x27xf32>, %weights: tensor<28x3x3x
 
 // -----
 
+// CHECK: [[$MAP1:.+]] = affine_map<(d0, d1, d2, d3) -> (d3)>
+// CHECK: [[$MAP2:.+]] = affine_map<(d0, d1, d2, d3) -> (d0, d1, d2, d3)>
+
+func.func @conv2d_dyn_output(%input: tensor<2x6x5x4xf32>, %weights: tensor<4x3x3x4xf32>, %bias: tensor<4xf32>) {
+  // %[[C0:.+]] = arith.constant 0 : index
+  // %[[DIM0:.+]] = tensor.dim %input, %[[C0]] : tensor<2x6x5x4xf32>
+  // %[[INIT_CONV:.+]] = tensor.empty(%[[DIM0]]) : tensor<?x4x3x4xf32>
+  // %[[ZERO:.+]] = arith.constant 0.000000e+00 : f32
+  // %[[FILL:.+]] = linalg.fill
+  // %[[INIT_GENERIC:.+]] = tensor.empty([[DIM0]]) : tensor<?x4x3x4xf32>
+
+  // %[[CONV:.+]] = linalg.conv_2d_nhwc_fhwc {dilations = dense<1> : tensor<2xi64>, strides = dense<1> : tensor<2xi64>} ins(%arg0, %arg1 : tensor<2x6x5x4xf32>, tensor<4x3x3x4xf32>) outs(%[[INIT_CONV]] : tensor<?x4x3x4xf32>) -> tensor<?x4x3x4xf32>
+  // linalg.generic {indexing_maps = [#[[MAP1]], #[[MAP2]], #[[MAP2]]], iterator_types = ["parallel", "parallel", "parallel", "parallel"]} ins(%arg2, %[[CONV]] : tensor<4xf32>, tensor<?x4x3x4xf32>) outs(%[[INIT_GENERIC]] : tensor<?x4x3x4xf32>) {
+  //   %[[ADD:.+]] = arith.addf
+  //   linalg.yield %[[ADD]] : f32
+  // } -> tensor<?x4x3x4xf32>
+
+  %0 = tosa.conv2d %input, %weights, %bias {dilation = array<i64: 1, 1>, pad = array<i64: 0, 0, 0, 0>, stride = array<i64: 1, 1>} : (tensor<2x6x5x4xf32    >, tensor<4x3x3x4xf32>, tensor<4xf32>) -> tensor<?x4x3x4xf32>
+  return
+}
+
+// -----
+
 // CHECK-LABEL: @conv2d_padded_f32
 func.func @conv2d_padded_f32(%input: tensor<1x47x40x28xf32>, %weights: tensor<28x3x3x28xf32>, %bias: tensor<28xf32>) -> () {
   // CHECK: %[[C0:.+]] = arith.constant 0