[mlir] Fix padding shape computation in PadTilingInterface #149576
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yzhang93
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rengolin
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@llvm/pr-subscribers-mlir @llvm/pr-subscribers-mlir-linalg Author: Vivian Zhang (yzhang93) ChangesThis PR fixes the computation of padded shapes for convolution-style affine maps (e.g., d0 + d1) in The new implementation uses the maximum accessed index as the input for affine map and then adds 1 after aggregating all the terms to get the final padded size. This fixed #148679. Full diff: https://github.com/llvm/llvm-project/pull/149576.diff 3 Files Affected:
diff --git a/mlir/lib/Dialect/Linalg/Transforms/PadTilingInterface.cpp b/mlir/lib/Dialect/Linalg/Transforms/PadTilingInterface.cpp
index 5eb3761f7aca1..c465383771617 100644
--- a/mlir/lib/Dialect/Linalg/Transforms/PadTilingInterface.cpp
+++ b/mlir/lib/Dialect/Linalg/Transforms/PadTilingInterface.cpp
@@ -114,24 +114,31 @@ SmallVector<OpFoldResult> linalg::computePaddedShape(
/*compressDims=*/true);
// If we are padding to the next multiple of, compose with ceil(sz) * sz.
+ OpFoldResult paddingDimOfr;
if (options.padToMultipleOf) {
AffineExpr d0, s0;
bindDims(rewriter.getContext(), d0);
bindSymbols(rewriter.getContext(), s0);
AffineMap ceilMap = AffineMap::get(1, 1, d0.ceilDiv(s0) * s0);
AffineMap composedMap = projectedMap.compose(ceilMap);
- OpFoldResult paddingDimOfr = affine::makeComposedFoldedAffineApply(
+ paddingDimOfr = affine::makeComposedFoldedAffineApply(
rewriter, loc, composedMap,
{indexingSizes[paddingDim], paddingSize},
/*composeAffineMin=*/true);
- terms.push_back(paddingDimOfr);
} else {
// Otherwise just set to paddingSize.
- OpFoldResult paddingDimOfr = affine::makeComposedFoldedAffineApply(
+ paddingDimOfr = affine::makeComposedFoldedAffineApply(
rewriter, loc, projectedMap, paddingSize);
- terms.push_back(paddingDimOfr);
}
+ // Adjust for the maximum accessed index which is (padding_size - 1).
+ AffineExpr d0;
+ bindDims(rewriter.getContext(), d0);
+ AffineMap subtractOneMap = AffineMap::get(1, 0, d0 - 1);
+ OpFoldResult maxAccessIdx = affine::makeComposedFoldedAffineApply(
+ rewriter, loc, subtractOneMap, {paddingDimOfr});
+ terms.push_back(maxAccessIdx);
+
LLVM_DEBUG(DBGS() << "------new term: " << terms.back() << "\n");
}
@@ -148,6 +155,8 @@ SmallVector<OpFoldResult> linalg::computePaddedShape(
AffineExpr sumExpr = dims.front();
for (unsigned i = 1; i < dims.size(); ++i)
sumExpr = sumExpr + dims[i];
+ // Add 1 to the maximum accessed index and get the final padded size.
+ sumExpr = sumExpr + rewriter.getAffineConstantExpr(1);
OpFoldResult paddedDimOfr =
affine::makeComposedFoldedAffineApply(rewriter, loc, sumExpr, terms);
paddedShape[resultIndex] = paddedDimOfr;
diff --git a/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface-multiple-of.mlir b/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface-multiple-of.mlir
index 78619b682673e..53cb7d7767b9a 100644
--- a/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface-multiple-of.mlir
+++ b/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface-multiple-of.mlir
@@ -52,22 +52,22 @@ module {
// CHECK-LABEL: @generic
// CHECK-SAME: %[[T0:.*]]: tensor<7x5xf32>,
-// CHECK-SAME: %[[T1:.*]]: tensor<7x11x12xf32>)
- func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x12xf32>) -> tensor<7x11x12xf32> {
+// CHECK-SAME: %[[T1:.*]]: tensor<7x11x11xf32>)
+ func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x11xf32>) -> tensor<7x11x11xf32> {
// CHECK-DAG: %[[CST:.*]] = arith.constant 0.
// CHECK: %[[PAD0:.*]] = tensor.pad %[[T0]] low[0, 0] high[2, 0]
// CHECK: : tensor<7x5xf32> to tensor<9x5xf32>
// CHECK: %[[PAD1:.*]] = tensor.pad %[[T1]] low[0, 0, 0] high[2, 4, 2] {
- // CHECK: : tensor<7x11x12xf32> to tensor<9x15x14xf32>
+ // CHECK: : tensor<7x11x11xf32> to tensor<9x15x13xf32>
// CHECK-NEXT: linalg.generic
- // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 12] [1, 1, 1] : tensor<9x15x14xf32> to tensor<7x11x12xf32>
- %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x12xf32>) {
+ // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 11] [1, 1, 1] : tensor<9x15x13xf32> to tensor<7x11x11xf32>
+ %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x11xf32>) {
^bb0(%in: f32, %out: f32):
linalg.yield %in : f32
- } -> tensor<7x11x12xf32>
- return %0 : tensor<7x11x12xf32>
+ } -> tensor<7x11x11xf32>
+ return %0 : tensor<7x11x11xf32>
}
module attributes {transform.with_named_sequence} {
transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) {
@@ -83,7 +83,7 @@ module {
// -----
// CHECK-DAG: #[[$MAP0:.*]] = affine_map<()[s0, s1] -> (-s1 + (s0 ceildiv 3) * 3)>
-// CHECK-DAG: #[[$MAP1:.*]] = affine_map<()[s0, s1] -> (-s1 + (s0 ceildiv 3) * 3 + 5)>
+// CHECK-DAG: #[[$MAP1:.*]] = affine_map<()[s0, s1] -> (-s1 + (s0 ceildiv 3) * 3 + 4)>
// CHECK-DAG: #[[$MAP2:.*]] = affine_map<()[s0] -> (s0 + 5)>
#map = affine_map<(d0, d1, d2) -> (d0, d1)>
@@ -272,3 +272,74 @@ module attributes {transform.with_named_sequence} {
}
}
+// -----
+
+// CHECK-LABEL: pad_conv
+func.func @pad_conv(%arg0: tensor<1x16x16x4xf32>, %arg1: tensor<16x3x3x4xf32>, %arg2: tensor<1x14x14x16xf32>) -> tensor<1x14x14x16xf32> {
+
+ // CHECK: tensor.pad %{{.*}} low[0, 0, 0, 0] high[0, 0, 2, 12]
+ // CHECK: : tensor<1x16x16x4xf32> to tensor<1x16x18x16xf32>
+ // CHECK: tensor.pad %{{.*}} low[0, 0, 0, 0] high[0, 0, 0, 12]
+ // CHECK: : tensor<16x3x3x4xf32> to tensor<16x3x3x16xf32>
+ // CHECK: tensor.pad %{{.*}} low[0, 0, 0, 0] high[0, 0, 2, 0]
+ // CHECK: : tensor<1x14x14x16xf32> to tensor<1x14x16x16xf32>
+ // CHECK-NEXT: linalg.conv_2d_nhwc_fhwc
+ // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0, 0] [1, 14, 14, 16] [1, 1, 1, 1] : tensor<1x14x16x16xf32> to tensor<1x14x14x16xf32>
+
+ %0 = linalg.conv_2d_nhwc_fhwc
+ {dilations = dense<1> : tensor<2xi64>, strides = dense<1> : tensor<2xi64> }
+ ins(%arg0, %arg1: tensor<1x16x16x4xf32>, tensor<16x3x3x4xf32>)
+ outs(%arg2: tensor<1x14x14x16xf32>) -> tensor<1x14x14x16xf32>
+ return %0 : tensor<1x14x14x16xf32>
+}
+
+module attributes {transform.with_named_sequence} {
+ transform.named_sequence @__transform_main(%arg1: !transform.any_op {transform.readonly}) {
+ %0 = transform.structured.match ops{["linalg.conv_2d_nhwc_fhwc"]} in %arg1 : (!transform.any_op) -> !transform.any_op
+ %padded, %pad = transform.structured.pad_tiling_interface %0 to padding_sizes [0, 0, 16, 0, 0, 0, 16] pad_to_multiple_of {
+ padding_values = [0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32]
+ } : (!transform.any_op) -> (!transform.any_op, !transform.any_op)
+ transform.yield
+ }
+}
+
+// -----
+
+// CHECK-DAG: #[[$MAP0:.*]] = affine_map<()[s0, s1] -> (-s1 + (s0 ceildiv 16) * 16 + 2)>
+// CHECK-DAG: #[[$MAP1:.*]] = affine_map<()[s0, s1] -> (-s1 + (s0 ceildiv 16) * 16)>
+
+// CHECK-LABEL: pad_conv_dynamic
+func.func @pad_conv_dynamic(%arg0: tensor<1x16x?x4xf32>, %arg1: tensor<16x3x3x4xf32>, %arg2: tensor<1x14x?x16xf32>) -> tensor<1x14x?x16xf32> {
+
+ // CHECK-DAG: %[[C2:.*]] = arith.constant 2 : index
+ // CHECK: %[[D0_0:.*]] = tensor.dim %{{.*}}, %[[C2]] : tensor<1x14x?x16xf32>
+ // CHECK: %[[D0_1:.*]] = tensor.dim %{{.*}}, %[[C2]] : tensor<1x16x?x4xf32>
+ // CHECK: %[[H0:.*]] = affine.apply #[[$MAP0]]()[%[[D0_0]], %[[D0_1]]]
+ // CHECK: tensor.pad %{{.*}} low[0, 0, 0, 0] high[0, 0, %[[H0]], 12]
+ // CHECK: : tensor<1x16x?x4xf32> to tensor<1x16x?x16xf32>
+ // CHECK: tensor.pad %{{.*}} low[0, 0, 0, 0] high[0, 0, 0, 12]
+ // CHECK: : tensor<16x3x3x4xf32> to tensor<16x3x3x16xf32>
+ // CHECK: %[[D1_0:.*]] = tensor.dim %{{.*}}, %[[C2]] : tensor<1x14x?x16xf32>
+ // CHECK: %[[H1:.*]] = affine.apply #[[$MAP1]]()[%[[D0_0]], %[[D1_0]]]
+ // CHECK: tensor.pad %{{.*}} low[0, 0, 0, 0] high[0, 0, %[[H1]], 0]
+ // CHECK: : tensor<1x14x?x16xf32> to tensor<1x14x?x16xf32>
+ // CHECK: %[[D2_0:.*]] = tensor.dim %{{.*}}, %[[C2]] : tensor<1x14x?x16xf32>
+ // CHECK-NEXT: linalg.conv_2d_nhwc_fhwc
+ // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0, 0] [1, 14, %[[D2_0]], 16] [1, 1, 1, 1] : tensor<1x14x?x16xf32> to tensor<1x14x?x16xf32>
+
+ %0 = linalg.conv_2d_nhwc_fhwc
+ {dilations = dense<1> : tensor<2xi64>, strides = dense<1> : tensor<2xi64> }
+ ins(%arg0, %arg1: tensor<1x16x?x4xf32>, tensor<16x3x3x4xf32>)
+ outs(%arg2: tensor<1x14x?x16xf32>) -> tensor<1x14x?x16xf32>
+ return %0 : tensor<1x14x?x16xf32>
+}
+
+module attributes {transform.with_named_sequence} {
+ transform.named_sequence @__transform_main(%arg1: !transform.any_op {transform.readonly}) {
+ %0 = transform.structured.match ops{["linalg.conv_2d_nhwc_fhwc"]} in %arg1 : (!transform.any_op) -> !transform.any_op
+ %padded, %pad = transform.structured.pad_tiling_interface %0 to padding_sizes [0, 0, 16, 0, 0, 0, 16] pad_to_multiple_of {
+ padding_values = [0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32, 0.0 : f32]
+ } : (!transform.any_op) -> (!transform.any_op, !transform.any_op)
+ transform.yield
+ }
+}
diff --git a/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface.mlir b/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface.mlir
index 26c03ed309c05..f7418769f79ca 100644
--- a/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface.mlir
+++ b/mlir/test/Dialect/Linalg/transform-op-pad-tiling-interface.mlir
@@ -69,22 +69,22 @@ module {
// CHECK-LABEL: @generic
// CHECK-SAME: %[[T0:.*]]: tensor<7x5xf32>,
-// CHECK-SAME: %[[T1:.*]]: tensor<7x11x12xf32>)
- func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x12xf32>) -> tensor<7x11x12xf32> {
+// CHECK-SAME: %[[T1:.*]]: tensor<7x11x11xf32>)
+ func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x11xf32>) -> tensor<7x11x11xf32> {
// CHECK-DAG: %[[CST:.*]] = arith.constant 0.
// CHECK: %[[PAD0:.*]] = tensor.pad %[[T0]] low[0, 0] high[1, 0]
// CHECK: : tensor<7x5xf32> to tensor<8x5xf32>
// CHECK: %[[PAD1:.*]] = tensor.pad %[[T1]] low[0, 0, 0] high[1, 3, 1] {
- // CHECK: : tensor<7x11x12xf32> to tensor<8x14x13xf32>
+ // CHECK: : tensor<7x11x11xf32> to tensor<8x14x12xf32>
// CHECK-NEXT: linalg.generic
- // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 12] [1, 1, 1] : tensor<8x14x13xf32> to tensor<7x11x12xf32>
- %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x12xf32>) {
+ // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 11] [1, 1, 1] : tensor<8x14x12xf32> to tensor<7x11x11xf32>
+ %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x11xf32>) {
^bb0(%in: f32, %out: f32):
linalg.yield %in : f32
- } -> tensor<7x11x12xf32>
- return %0 : tensor<7x11x12xf32>
+ } -> tensor<7x11x11xf32>
+ return %0 : tensor<7x11x11xf32>
}
module attributes {transform.with_named_sequence} {
transform.named_sequence @__transform_main(%arg0: !transform.any_op {transform.readonly}) {
@@ -102,7 +102,7 @@ module {
// CHECK-DAG: #[[$MAP0:.*]] = affine_map<()[s0] -> (-s0 + 8)>
-// CHECK-DAG: #[[$MAP1:.*]] = affine_map<()[s0] -> (-s0 + 13)>
+// CHECK-DAG: #[[$MAP1:.*]] = affine_map<()[s0] -> (-s0 + 12)>
// CHECK-DAG: #[[$MAP2:.*]] = affine_map<()[s0] -> (s0 + 5)>
#map = affine_map<(d0, d1, d2) -> (d0, d1)>
@@ -127,13 +127,13 @@ module {
// CHECK: %[[D2_0:.*]] = tensor.dim %{{.*}}, %[[C2]] : tensor<?x11x?xf32>
// CHECK: %[[H2:.*]] = affine.apply #[[$MAP1]]()[%[[D2_0]]]
// CHECK: tensor.pad %{{.*}} low[0, 0, 0] high[%[[H1]], 3, %[[H2]]] {
- // CHECK: : tensor<?x11x?xf32> to tensor<8x14x13xf32>
+ // CHECK: : tensor<?x11x?xf32> to tensor<8x14x12xf32>
//
// CHECK: %[[D0_2:.*]] = tensor.dim %{{.*}}, %[[C0]] : tensor<?x5xf32>
// CHECK: %[[D2_1:.*]] = affine.apply #[[$MAP2]]()[%[[D0_2]]]
- // CHECK: linalg.generic {{.*}} ins(%{{.*}} : tensor<8x5xf32>) outs(%{{.*}} : tensor<8x14x13xf32>) {
- // CHECK: } -> tensor<8x14x13xf32>
- // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [%[[D0_2]], 11, %[[D2_1]]] [1, 1, 1] : tensor<8x14x13xf32> to tensor<?x11x?xf32>
+ // CHECK: linalg.generic {{.*}} ins(%{{.*}} : tensor<8x5xf32>) outs(%{{.*}} : tensor<8x14x12xf32>) {
+ // CHECK: } -> tensor<8x14x12xf32>
+ // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [%[[D0_2]], 11, %[[D2_1]]] [1, 1, 1] : tensor<8x14x12xf32> to tensor<?x11x?xf32>
//
%0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<?x5xf32>) outs(%arg1 : tensor<?x11x?xf32>) {
^bb0(%in: f32, %out: f32):
|
Groverkss
reviewed
Jul 21, 2025
Comment on lines
-55
to
-70
| // CHECK-SAME: %[[T1:.*]]: tensor<7x11x12xf32>) | ||
| func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x12xf32>) -> tensor<7x11x12xf32> { | ||
| // CHECK-SAME: %[[T1:.*]]: tensor<7x11x11xf32>) | ||
| func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x11xf32>) -> tensor<7x11x11xf32> { | ||
|
|
||
| // CHECK-DAG: %[[CST:.*]] = arith.constant 0. | ||
|
|
||
| // CHECK: %[[PAD0:.*]] = tensor.pad %[[T0]] low[0, 0] high[2, 0] | ||
| // CHECK: : tensor<7x5xf32> to tensor<9x5xf32> | ||
| // CHECK: %[[PAD1:.*]] = tensor.pad %[[T1]] low[0, 0, 0] high[2, 4, 2] { | ||
| // CHECK: : tensor<7x11x12xf32> to tensor<9x15x14xf32> | ||
| // CHECK: : tensor<7x11x11xf32> to tensor<9x15x13xf32> | ||
| // CHECK-NEXT: linalg.generic | ||
| // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 12] [1, 1, 1] : tensor<9x15x14xf32> to tensor<7x11x12xf32> | ||
| %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x12xf32>) { | ||
| // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 11] [1, 1, 1] : tensor<9x15x13xf32> to tensor<7x11x11xf32> | ||
| %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x11xf32>) { | ||
| ^bb0(%in: f32, %out: f32): | ||
| linalg.yield %in : f32 | ||
| } -> tensor<7x11x12xf32> | ||
| return %0 : tensor<7x11x12xf32> |
Comment on lines
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| // CHECK-SAME: %[[T1:.*]]: tensor<7x11x12xf32>) | ||
| func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x12xf32>) -> tensor<7x11x12xf32> { | ||
| // CHECK-SAME: %[[T1:.*]]: tensor<7x11x11xf32>) | ||
| func.func @generic(%arg0: tensor<7x5xf32>, %arg1: tensor<7x11x11xf32>) -> tensor<7x11x11xf32> { | ||
|
|
||
| // CHECK-DAG: %[[CST:.*]] = arith.constant 0. | ||
|
|
||
| // CHECK: %[[PAD0:.*]] = tensor.pad %[[T0]] low[0, 0] high[1, 0] | ||
| // CHECK: : tensor<7x5xf32> to tensor<8x5xf32> | ||
| // CHECK: %[[PAD1:.*]] = tensor.pad %[[T1]] low[0, 0, 0] high[1, 3, 1] { | ||
| // CHECK: : tensor<7x11x12xf32> to tensor<8x14x13xf32> | ||
| // CHECK: : tensor<7x11x11xf32> to tensor<8x14x12xf32> | ||
| // CHECK-NEXT: linalg.generic | ||
| // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 12] [1, 1, 1] : tensor<8x14x13xf32> to tensor<7x11x12xf32> | ||
| %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x12xf32>) { | ||
| // CHECK: tensor.extract_slice %{{.*}}[0, 0, 0] [7, 11, 11] [1, 1, 1] : tensor<8x14x12xf32> to tensor<7x11x11xf32> | ||
| %0 = linalg.generic {indexing_maps = [#map, #map1], iterator_types = ["parallel", "parallel", "reduction"]} ins(%arg0 : tensor<7x5xf32>) outs(%arg1 : tensor<7x11x11xf32>) { | ||
| ^bb0(%in: f32, %out: f32): | ||
| linalg.yield %in : f32 | ||
| } -> tensor<7x11x12xf32> | ||
| return %0 : tensor<7x11x12xf32> |
There was a problem hiding this comment.
why were these test inputs changed?
There was a problem hiding this comment.
Please refer to the explanation below. I think this test is similar to the convolution case that the final shape after (d0 + d1) mapping might be wrong.
fabianmcg
requested changes
Jul 21, 2025
|
I dont know all the details ( @yzhang93 can fill them in), but basically I think the issue comes with using the "size" of the iteration domain directly. Indexing maps work on indices and dont translate to size (such errors have been seen previously w.r.t shape computations using convolutions). Basically, take the
So the correct range size is When the map is a projected permutation like I think something similar is happening here, but I dont know all the details w.r.t to padding. |
|
Thanks for the explanation, yes this is one of those issues. The above fix works for the problem reappears. |
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This PR fixes the computation of padded shapes for convolution-style affine maps (e.g., d0 + d1) in
PadTilingInterface. Previously, the codes used the direct sum of loop upper bounds, leading to over-padding. For example, the followingconv_2d_nhwc_fhwcop, if only padding the c dimensions to multiples of 16, it also incorrectly pads the convolved dimensions and generates the wrong input shape as:The new implementation uses the maximum accessed index as the input for affine map and then adds 1 after aggregating all the terms to get the final padded size. This fixed #148679.