[Mlir-commits] [mlir] [MLIR][XeGPU] refine verifier for TensorDescType (PR #137226)
llvmlistbot at llvm.org
llvmlistbot at llvm.org
Thu Apr 24 11:26:21 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-mlir
Author: Chao Chen (chencha3)
<details>
<summary>Changes</summary>
This PR updates the verifier of TensorDescType after the extension of LayoutAttr in #<!-- -->132425.
---
Full diff: https://github.com/llvm/llvm-project/pull/137226.diff
5 Files Affected:
- (modified) mlir/include/mlir/Dialect/XeGPU/IR/XeGPU.h (+3-1)
- (modified) mlir/include/mlir/Dialect/XeGPU/IR/XeGPUDialect.td (+6)
- (modified) mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp (+70-17)
- (modified) mlir/lib/Dialect/XeGPU/IR/XeGPUOps.cpp (+2-30)
- (modified) mlir/test/Dialect/XeGPU/invalid.mlir (+4-4)
``````````diff
diff --git a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPU.h b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPU.h
index d6c51d20571fd..8e2784f40ad39 100644
--- a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPU.h
+++ b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPU.h
@@ -25,12 +25,14 @@ class TensorDescType;
} // namespace xegpu
} // namespace mlir
-#include <mlir/Dialect/XeGPU/IR/XeGPUDialect.h.inc>
#include <mlir/Dialect/XeGPU/IR/XeGPUEnums.h.inc>
#define GET_ATTRDEF_CLASSES
#include <mlir/Dialect/XeGPU/IR/XeGPUAttrs.h.inc>
#define GET_TYPEDEF_CLASSES
#include <mlir/Dialect/XeGPU/IR/XeGPUTypes.h.inc>
+
+#include <mlir/Dialect/XeGPU/IR/XeGPUDialect.h.inc>
+
#define GET_OP_CLASSES
#include <mlir/Dialect/XeGPU/IR/XeGPU.h.inc>
diff --git a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUDialect.td b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUDialect.td
index fb5a1e6f1db0c..549018b61d6fb 100644
--- a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUDialect.td
+++ b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUDialect.td
@@ -36,6 +36,12 @@ def XeGPU_Dialect : Dialect {
let useDefaultTypePrinterParser = true;
let useDefaultAttributePrinterParser = true;
+
+ let extraClassDeclaration = [{
+ /// Checks if the given shape can be evenly distributed based on the layout
+ /// and data factors provided by the LayoutAttr.
+ static bool isEvenlyDistributable(llvm::ArrayRef<int64_t> shape, xegpu::LayoutAttr attr);
+ }];
}
#endif // MLIR_DIALECT_XEGPU_IR_XEGPUDIALECT_TD
diff --git a/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp b/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp
index b865b80f0075e..8694d2f950dd9 100644
--- a/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp
+++ b/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp
@@ -6,6 +6,7 @@
//
//===----------------------------------------------------------------------===//
+#include "mlir/Dialect/Utils/IndexingUtils.h"
#include "mlir/Dialect/XeGPU/IR/XeGPU.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/DialectImplementation.h"
@@ -30,6 +31,61 @@ void XeGPUDialect::initialize() {
>();
}
+bool XeGPUDialect::isEvenlyDistributable(llvm::ArrayRef<int64_t> shape,
+ xegpu::LayoutAttr attr) {
+ assert(attr && "Layout attribute is missing.");
+
+ auto getSubShapeOrNull =
+ [&](llvm::ArrayRef<int64_t> shape, DenseI32ArrayAttr layout,
+ DenseI32ArrayAttr data,
+ bool use_rr = true) -> std::optional<SmallVector<int64_t>> {
+ llvm::SmallVector<int64_t> newShape(shape);
+ if (layout) {
+ auto vec = llvm::to_vector_of<int64_t>(layout.asArrayRef());
+ if (vec.size() != shape.size())
+ return std::nullopt;
+ auto ratio = computeShapeRatio(shape, vec);
+ if (!ratio.has_value())
+ return std::nullopt;
+ newShape = ratio.value();
+ }
+
+ if (data) {
+ auto vec = llvm::to_vector_of<int64_t>(data.asArrayRef());
+ if (vec.size() != shape.size())
+ return std::nullopt;
+ auto ratio = computeShapeRatio(newShape, vec);
+ if (!ratio.has_value() && use_rr)
+ ratio = computeShapeRatio(vec, newShape);
+ if (!ratio.has_value())
+ return std::nullopt;
+
+ // if data is not null, we always return it for next phase.
+ newShape = vec;
+ }
+ return newShape;
+ };
+
+ // check the sgLayout and sgData
+ auto maybeSgShape =
+ getSubShapeOrNull(shape, attr.getSgLayout(), attr.getSgData());
+ if (!maybeSgShape)
+ return false;
+ auto sgShape = maybeSgShape.value();
+
+ // check InstData, it neither have layout nor need round-robin
+ auto maybeInstShape =
+ getSubShapeOrNull(sgShape, nullptr, attr.getInstData(), false);
+ if (!maybeInstShape)
+ return false;
+ auto instShape = maybeInstShape.value();
+
+ // check LaneLayout and LaneData
+ auto maybeLaneShape = getSubShapeOrNull(instShape, attr.getLaneLayout(),
+ attr.getLaneData(), false);
+ return maybeLaneShape.has_value();
+}
+
//===----------------------------------------------------------------------===//
// XeGPU_BlockTensorDescAttr
//===----------------------------------------------------------------------===//
@@ -241,7 +297,7 @@ LogicalResult TensorDescType::verify(
llvm::ArrayRef<int64_t> shape, mlir::Type elementType,
mlir::Attribute encoding, mlir::Attribute layout) {
size_t rank = shape.size();
- // Low-pressure types are packed in 32-bit units.
+ // Low-precision types are packed in 32-bit units.
int32_t packingFactor = 32 / elementType.getIntOrFloatBitWidth();
if (rank != 1 && rank != 2)
return emitError() << "expected 1D or 2D tensor";
@@ -268,23 +324,21 @@ LogicalResult TensorDescType::verify(
}
}
- if (auto blockAttr =
- mlir::dyn_cast_if_present<BlockTensorDescAttr>(encoding)) {
+ auto blockAttr = mlir::dyn_cast_if_present<BlockTensorDescAttr>(encoding);
+ if (blockAttr) {
MemorySpaceAttr memorySpaceAttr = blockAttr.getMemorySpace();
if (rank == 2 && memorySpaceAttr &&
memorySpaceAttr.getValue() == MemorySpace::SLM)
return emitError() << "SLM is not supported for 2D block tensor";
}
- if (auto layoutAttr = llvm::dyn_cast_if_present<LayoutAttr>(layout)) {
-
+ auto layoutAttr = llvm::dyn_cast_if_present<LayoutAttr>(layout);
+ if (layoutAttr) {
if (rank != (size_t)layoutAttr.getRank())
return emitError() << "expected layout rank to match tensor rank";
- ArrayRef<int32_t> laneLayout = layoutAttr.getLaneLayout().asArrayRef();
- ArrayRef<int32_t> laneData = layoutAttr.getLaneData().asArrayRef();
-
- if (scatterAttr) {
+ auto laneData = layoutAttr.getLaneData();
+ if (scatterAttr && laneData) {
// Validate subgroup mapping rules for scattered tensors.
// A work-item's slice of the tensor with shape [sg_size] or
// [sg_size, chunk_size] will be [1] or [1, 32/element_ty_bit_width]
@@ -294,20 +348,19 @@ LogicalResult TensorDescType::verify(
if (rank > 1 && laneData[0] != 1)
return emitError()
<< "cannot map over non-contiguous scattered row elements";
- if (laneData.back() != packingFactor)
+ if (laneData[rank - 1] != packingFactor)
return emitError() << "work item data mapping must match the number of "
"contiguous elements";
}
- for (size_t i = 0; i < shape.size(); ++i) {
- uint32_t numElemPerWi = laneLayout[i] * laneData[i];
- if (shape[i] < numElemPerWi || shape[i] % numElemPerWi != 0)
- return emitError() << "cannot distribute " << shape[i] << " over "
- << laneLayout[i] << " work items with "
- << laneData[i] << " elements each";
+ if (!XeGPUDialect::isEvenlyDistributable(shape, layoutAttr)) {
+ std::string shapeStr;
+ llvm::raw_string_ostream stream(shapeStr);
+ llvm::interleaveComma(shape, stream);
+ return emitError() << "cannot distribute [" << shapeStr << "] using "
+ << layoutAttr;
}
}
-
return success();
}
diff --git a/mlir/lib/Dialect/XeGPU/IR/XeGPUOps.cpp b/mlir/lib/Dialect/XeGPU/IR/XeGPUOps.cpp
index e0e25365220b5..f9d7e013826ed 100644
--- a/mlir/lib/Dialect/XeGPU/IR/XeGPUOps.cpp
+++ b/mlir/lib/Dialect/XeGPU/IR/XeGPUOps.cpp
@@ -73,34 +73,6 @@ static bool isWriteHintOrNone(const CachePolicyAttr &attr) {
kind == CachePolicy::WRITE_BACK || kind == CachePolicy::WRITE_THROUGH;
}
-// Checks if the given shape is evenly distributed based on the layout
-// and data factors provided by the LayoutAttr. The function ensures that
-// each dimension of the shape can be evenly divided by the corresponding
-// data factor, and the resulting quotient can be evenly divided by the
-// layout factor. Returns `true` if the shape is evenly distributed,
-// otherwise `false`.
-static bool isEvenDistributed(llvm::ArrayRef<int64_t> shape,
- xegpu::LayoutAttr attr) {
- assert(attr && "Layout attribute is missing.");
- llvm::SmallVector<int32_t> defaults(shape.size(), 1);
- llvm::ArrayRef<int32_t> layout, data;
- if (auto sg_layout = attr.getSgLayout()) {
- layout = sg_layout.asArrayRef();
- auto sg_data = attr.getSgData();
- data = sg_data ? sg_data.asArrayRef() : defaults;
- } else {
- layout = attr.getLaneLayout().asArrayRef();
- auto lane_data = attr.getLaneData();
- data = lane_data ? lane_data.asArrayRef() : defaults;
- }
- for (auto [dimSize, dataFactor, layoutFactor] :
- llvm::zip_equal(shape, data, layout)) {
- if (dimSize % dataFactor != 0 || (dimSize / dataFactor) % layoutFactor != 0)
- return false;
- }
- return true;
-}
-
static LogicalResult
isValidGatherScatterParams(Type maskTy, VectorType valueTy,
TensorDescType tdescTy, UnitAttr transposeAttr,
@@ -685,10 +657,10 @@ LogicalResult ConvertLayoutOp::verify() {
"expected srcMap and resMap be WgLayout or SgLayout at the same time.");
auto shape = getSource().getType().getShape();
- if (!isEvenDistributed(shape, srcMap))
+ if (!XeGPUDialect::isEvenlyDistributable(shape, srcMap))
return emitOpError("invalid srcMap, data cannot be evenly distributed.");
- if (!isEvenDistributed(shape, resMap))
+ if (!XeGPUDialect::isEvenlyDistributable(shape, resMap))
return emitOpError("invalid resMap, data cannot be evenly distributed.");
return mlir::success();
diff --git a/mlir/test/Dialect/XeGPU/invalid.mlir b/mlir/test/Dialect/XeGPU/invalid.mlir
index 67ed89e11b4c9..2fd4d6280649c 100644
--- a/mlir/test/Dialect/XeGPU/invalid.mlir
+++ b/mlir/test/Dialect/XeGPU/invalid.mlir
@@ -404,7 +404,7 @@ func.func @tensor_desc_1D_invalid_map_data(%src: memref<24x32xf32>) {
// -----
func.func @tensor_desc_invalid_map_layout(%src: memref<24x32xf32>) {
%0 = xegpu.create_nd_tdesc %src[0, 0] : memref<24x32xf32> ->
- // expected-error at +1 {{cannot distribute 8 over 16 work items with 1 elements each}}
+ // expected-error at +1 {{cannot distribute [4, 8] using #xegpu.layout<lane_layout = [1, 16], lane_data = [1, 1]>}}
!xegpu.tensor_desc<4x8xf32, #xegpu.layout<lane_layout = [1, 16], lane_data = [1, 1]>>
return
}
@@ -412,7 +412,7 @@ func.func @tensor_desc_invalid_map_layout(%src: memref<24x32xf32>) {
// -----
func.func @tensor_desc_invalid_map_layout_1(%src: memref<24x32xf32>) {
%0 = xegpu.create_nd_tdesc %src[0, 0] : memref<24x32xf32> ->
- // expected-error at +1 {{cannot distribute 4 over 8 work items with 1 elements each}}
+ // expected-error at +1 {{cannot distribute [4, 8] using #xegpu.layout<lane_layout = [8, 2], lane_data = [1, 1]>}}
!xegpu.tensor_desc<4x8xf32, #xegpu.layout<lane_layout = [8, 2], lane_data = [1, 1]>>
return
}
@@ -420,7 +420,7 @@ func.func @tensor_desc_invalid_map_layout_1(%src: memref<24x32xf32>) {
// -----
func.func @tensor_desc_invalid_map_data(%src: memref<24x32xf32>) {
%0 = xegpu.create_nd_tdesc %src[0, 0] : memref<24x32xf32> ->
- // expected-error at +1 {{cannot distribute 4 over 2 work items with 4 elements each}}
+ // expected-error at +1 {{cannot distribute [4, 8] using #xegpu.layout<lane_layout = [2, 8], lane_data = [4, 1]>}}
!xegpu.tensor_desc<4x8xf32, #xegpu.layout<lane_layout = [2, 8], lane_data = [4, 1]>>
return
}
@@ -428,7 +428,7 @@ func.func @tensor_desc_invalid_map_data(%src: memref<24x32xf32>) {
// -----
func.func @tensor_desc_invalid_map_data_1(%src: memref<24x32xf32>) {
%0 = xegpu.create_nd_tdesc %src[0, 0] : memref<24x32xf32> ->
- // expected-error at +1 {{cannot distribute 4 over 8 work items with 1 elements each}}
+ // expected-error at +1 {{cannot distribute [4, 8] using #xegpu.layout<lane_layout = [8, 2], lane_data = [1, 2]>}}
!xegpu.tensor_desc<4x8xf32, #xegpu.layout<lane_layout = [8, 2], lane_data = [1, 2]>>
return
}
``````````
</details>
https://github.com/llvm/llvm-project/pull/137226
More information about the Mlir-commits
mailing list