[MLIR][XeGPU] Updates XeGPU TensorDescAttr and Refine Gather/Scatter definition. #109144
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chencha3
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@llvm/pr-subscribers-mlir-gpu @llvm/pr-subscribers-mlir Author: Chao Chen (chencha3) ChangesThe PR makes the following refine changes to the XeGPU dialect.
Patch is 52.14 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/109144.diff 7 Files Affected:
diff --git a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUAttrs.td b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUAttrs.td
index f3ca09a6a68ea8..26eec0d4f2082a 100644
--- a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUAttrs.td
+++ b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUAttrs.td
@@ -19,12 +19,18 @@ class XeGPUAttr<string name, string attrMnemonic, list<Trait> traits = [],
let mnemonic = attrMnemonic;
}
-def XeGPU_TensorDescAttr: XeGPUAttr<"TensorDesc", "tdesc_attr"> {
+class XeGPU_TensorDescAttr<string name, string attrMnemonic, list<Trait> traits = [],
+ string baseCppClass = "::mlir::Attribute">
+ : XeGPUAttr<name, attrMnemonic, traits, baseCppClass> {
+ let assemblyFormat = "`<` struct(params) `>`";
+}
+
+def XeGPU_BlockTensorDescAttr: XeGPU_TensorDescAttr<"BlockTensorDesc", "block_tdesc_attr"> {
let summary = [{a composite attribute for `TensorDescType`}];
- let description = [{`TensorDescAttr` (or `tdesc_attr`) is a composite
+ let description = [{`BlockTensorDesc` (or `block_tdesc_attr`) is a composite
attribute defined for `TensorDescType` for describing following
properties of a `TensorDesc`.
- 1. `memory_scope`: It describes where the data block described by the
+ 1. `memory_space`: It describes where the data block described by the
TensorDesc is located, `Global` device memory or `Shared` local memory.
It is default to `Global`.
2. `array_length`: It describes how many horizontally consecutive blocks
@@ -33,43 +39,63 @@ def XeGPU_TensorDescAttr: XeGPUAttr<"TensorDesc", "tdesc_attr"> {
8x32. Its default value is 1.
3. `boundary_check`: It is used to indicates the hardware whether to do
out-of-boundary check. The default value is true.
- 4. `scattered`: It is used to differenciate TensorDescs created from
- `create_nd_tdesc` vs from `create_tdesc`.
}];
let parameters = (ins
- OptionalParameter<"MemoryScopeAttr">: $memory_scope,
+ OptionalParameter<"MemorySpaceAttr">: $memory_space,
OptionalParameter<"IntegerAttr", "1">: $array_length,
- OptionalParameter<"BoolAttr", "true">: $boundary_check,
- OptionalParameter<"BoolAttr", "false">: $scattered
+ OptionalParameter<"BoolAttr", "true">: $boundary_check
);
let builders = [
AttrBuilder<(ins
- CArg<"xegpu::MemoryScope", "xegpu::MemoryScope::Global">:$memory_scope,
+ CArg<"xegpu::MemorySpace", "xegpu::MemorySpace::Global">:$memory_space,
CArg<"int", "1">:$array_length,
- CArg<"bool", "true">: $boundary_check,
- CArg<"bool", "false">: $scattered
+ CArg<"bool", "true">: $boundary_check
)>
];
- let assemblyFormat = "`<` struct(params) `>`";
}
+def XeGPU_ScatterTensorDescAttr: XeGPU_TensorDescAttr<"ScatterTensorDesc", "scatter_tdesc_attr"> {
+ let summary = [{a composite attribute for `TensorDescType`}];
+ let description = [{`ScatterTensorDesc` (or `scatter_tdesc_attr`) is a composite
+ attribute defined for `TensorDescType` for describing following
+ properties of a `TensorDesc`.
+ 1. `memory_space`: It describes where the data block described by the
+ TensorDesc is located, `Global` device memory or `Shared` local memory.
+ It is default to `Global`.
+ 2. `chunk_size`: indicates number of continious elements accessed for each
+ offset, default is 1. It is used with `scattered` attr only.
+ }];
+
+ let parameters = (ins
+ OptionalParameter<"MemorySpaceAttr">: $memory_space,
+ OptionalParameter<"IntegerAttr", "1">: $chunk_size
+ );
+
+ let builders = [
+ AttrBuilder<(ins
+ CArg<"xegpu::MemorySpace", "xegpu::MemorySpace::Global">:$memory_space,
+ CArg<"int", "1">: $chunk_size
+ )>
+ ];
+ }
+
//===----------------------------------------------------------------------===//
// XeGPU Memory Scope Enums.
//===----------------------------------------------------------------------===//
-def XeGPU_MemoryScopeGlobal: I32EnumAttrCase<"Global", 0, "global">;
-def XeGPU_MemoryScopeShared: I32EnumAttrCase<"SLM", 1, "slm">;
-def XeGPU_MemoryScope: I32EnumAttr<"MemoryScope",
+def XeGPU_MemorySpaceGlobal: I32EnumAttrCase<"Global", 0, "global">;
+def XeGPU_MemorySpaceShared: I32EnumAttrCase<"SLM", 3, "slm">;
+def XeGPU_MemorySpace: I32EnumAttr<"MemorySpace",
"The address space of the memory the tensor descritor is created for",
- [XeGPU_MemoryScopeGlobal, XeGPU_MemoryScopeShared]> {
+ [XeGPU_MemorySpaceGlobal, XeGPU_MemorySpaceShared]> {
let genSpecializedAttr = 0;
let cppNamespace = "::mlir::xegpu";
}
-def XeGPU_MemoryScopeAttr:
- EnumAttr<XeGPU_Dialect, XeGPU_MemoryScope, "memory_scope"> {
+def XeGPU_MemorySpaceAttr:
+ EnumAttr<XeGPU_Dialect, XeGPU_MemorySpace, "memory_space"> {
let summary = [{Describe the location of data described by a `TensorDesc`:
Global device memory (`Global`) or Shared local memory (`SLM`).}];
let assemblyFormat = "$value";
@@ -116,4 +142,4 @@ def XeGPU_FenceScopeAttr:
let assemblyFormat = "$value";
}
-#endif // MLIR_DIALECT_XEGPU_IR_XEGPUATTRS_TD
\ No newline at end of file
+#endif // MLIR_DIALECT_XEGPU_IR_XEGPUATTRS_TD
diff --git a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUOps.td b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUOps.td
index c32c7541c39791..e24a056de2caf3 100644
--- a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUOps.td
+++ b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUOps.td
@@ -218,6 +218,23 @@ def XeGPU_CreateNdDescOp: XeGPU_Op<"create_nd_tdesc", [Pure, ViewLikeOpInterface
static unsigned getOffsetSizeAndStrideStartOperandIndex() { return 1; }
mlir::Value getViewSource() { return getSource(); }
+
+ unsigned getSourceMemorySpace() {
+ auto srcTy = getSourceType();
+ if (auto memrefTy = llvm::dyn_cast<mlir::MemRefType>(srcTy)) {
+ auto attr = memrefTy.getMemorySpace();
+ if (attr) {
+ if (auto intAttr = llvm::dyn_cast<mlir::IntegerAttr>(attr)) {
+ return static_cast<unsigned>(intAttr.getInt());
+ }
+ if (auto memSpaceAttr = llvm::dyn_cast<MemorySpaceAttr>(attr))
+ return static_cast<unsigned>(memSpaceAttr.getValue());
+ }
+ }
+ // take global as default memory scope.
+ return static_cast<unsigned>(MemorySpace::Global);
+ }
+
}];
}
@@ -411,8 +428,10 @@ def XeGPU_CreateDescOp: XeGPU_Op<"create_tdesc", [Pure, ViewLikeOpInterface]> {
is fixed to the hardware supportted subgroup size, e.g., 16 on PVC,
implying each element in the array corresponds to a work-item (SIMT lane)
in the subgroup.
- * chunk_size: [optional attribute] indicates number of continious
- elements accessed for each offset, default is 1.
+
+ The first dimension of the result TensorDesc corresponds to work-items, so it should
+ match the dimension of offsets. It may also has a second dimension corresponding to
+ the chunk_size if the chunk size is larger than 1.
Example 1. It assumes subgroup size is 4, and accesses a[0], a[16], a[32], a[64]
```mlir
@@ -424,29 +443,22 @@ def XeGPU_CreateDescOp: XeGPU_Op<"create_tdesc", [Pure, ViewLikeOpInterface]> {
It will access totally 32 data elements: a[0:7], a[16:23], a[32:39], a[64:71]
```mlir
%0 = memref.alloc() : memref<1024xf32>
- %1 = xegpu.create_tdesc %0[0, 16, 32, 64] {chunk_size = 8}: memref<1024xf32> -> TensorDesc<4x8xf32>
+ %1 = xegpu.create_tdesc %0[0, 16, 32, 64] : memref<1024xf32> -> TensorDesc<4x8xf32, chunk_size = 8>
```
Example 3. It is similar to Example 2, but there is some overlaps among workitems.
It accesses: a[0:7], a[4:11], a[8:15], a[12:19]
```mlir
%0 = memref.alloc() : memref<1024xf32>
- %1 = xegpu.create_tdesc %0[0, 4, 8, 12] {chunk_size = 8}: memref<1024xf32> -> TensorDesc<4x8xf32>
+ %1 = xegpu.create_tdesc %0[0, 4, 8, 12] : memref<1024xf32> -> TensorDesc<4x8xf32, chunk_size = 8>>
```
}];
let arguments = (ins XeGPU_BaseAddrType: $source,
Variadic<Index>: $offsets,
- DenseI64ArrayAttr: $const_offsets,
- DefaultValuedAttr<I64Attr, "1">: $chunk_size);
+ DenseI64ArrayAttr: $const_offsets);
let results = (outs XeGPU_TensorDesc:$TensorDesc);
- let builders = [
- OpBuilder<(ins "xegpu::TensorDescType": $TensorDesc, "Value": $source,
- "llvm::ArrayRef<OpFoldResult>": $offsets,
- CArg<"uint32_t", "1"> : $chunk_size)>,
- ];
-
let assemblyFormat = [{
$source
custom<DynamicIndexList>($offsets, $const_offsets)
@@ -473,6 +485,22 @@ def XeGPU_CreateDescOp: XeGPU_Op<"create_tdesc", [Pure, ViewLikeOpInterface]> {
assert(idx < getNumOffsets() && "Invalid out of bound access.");
return getMixedOffsets()[idx];
}
+
+ unsigned getSourceMemorySpace() {
+ auto srcTy = getSource().getType();
+ if (auto memrefTy = llvm::dyn_cast<mlir::MemRefType>(srcTy)) {
+ auto attr = memrefTy.getMemorySpace();
+ if (attr) {
+ if (auto intAttr = llvm::dyn_cast<mlir::IntegerAttr>(attr))
+ return static_cast<unsigned>(intAttr.getInt());
+ if (auto memSpaceAttr = llvm::dyn_cast<MemorySpaceAttr>(attr))
+ return static_cast<unsigned>(memSpaceAttr.getValue());
+ }
+ }
+ // take global as default memory scope.
+ return static_cast<unsigned>(MemorySpace::Global);
+ }
+
}];
let hasVerifier = 1;
@@ -520,28 +548,31 @@ def XeGPU_LoadGatherOp : XeGPU_Op<"load", [AllRanksMatch<["value", "TensorDesc"]
let description = [{ It (aka. load) load data per each work-item. The output
describes the data being loaded at the subgroup level, so its size is
- consistent with the number of work-items in a subgroup. When `chunk_size_per_lane`
- attribute is larger than 1 in TensorDesc, the output vector will be 2D vector,
- with dim-1 correspoding to the chunk size.
+ consistent with the number of work-items in a subgroup. When the chunk size
+ is larger than 2, the output vector is a 2D vector, with dim-1 correspoding
+ to work-items, and dim-0 corresponding to the chunk_size loaded by each work-item.
+ Specially, there is a transpose effect on the result (as compared to the TensorDesc)
+ due to the hardware implementation. Therefore, a transpose attribute is introduced
+ on purpose, making sure users are aware of this implicit transformation.
The mask operand masks out memory access so that it is safe to pass out-of-boundary
addresses/offsets as long as they are masked. It applies to slots of SIMD lanes.
Example:
```mlir
- %2 = xegpu.load %1, %0 {transpose = [1, 0],
+ %2 = xegpu.load %1, %0 {transpose,
l1_hint = #xegpu.cache_hint<cached>,
l2_hint = #xegpu.cache_hint<uncached>,
l3_hint = #xegpu.cache_hint<uncached>}
- : !xegpu.tensor_desc<16xf32, #xegpu.tdesc_attr<scattered=true>>, vector<16xi1>
- -> vector<16xf32>
+ : !xegpu.tensor_desc<16xf32, #xegpu.scatter_tdesc_attr<memory_space=global>>,
+ vector<16xi1> -> vector<16xf32>
```
}];
let arguments = (ins XeGPU_TensorDesc: $TensorDesc,
XeGPU_MaskType: $mask,
- OptionalAttr<DenseI64ArrayAttr>: $transpose,
+ OptionalAttr<UnitAttr>: $transpose,
OptionalAttr<XeGPU_CacheHintAttr>: $l1_hint,
OptionalAttr<XeGPU_CacheHintAttr>: $l2_hint,
OptionalAttr<XeGPU_CacheHintAttr>: $l3_hint);
@@ -573,11 +604,15 @@ def XeGPU_LoadGatherOp : XeGPU_Op<"load", [AllRanksMatch<["value", "TensorDesc"]
let hasVerifier = 1;
}
-def XeGPU_StoreScatterOp : XeGPU_Op<"store", [AllShapesMatch<["value", "TensorDesc"]>,
- AllElementTypesMatch<["value", "TensorDesc"]>]> {
+def XeGPU_StoreScatterOp : XeGPU_Op<"store", [AllElementCountsMatch<["value", "TensorDesc"]>,
+ AllElementTypesMatch<["value", "TensorDesc"]>]> {
let summary = "store data to scattered memory locations.";
- let description = [{ It (aka. store) stores data to scattered memory locations.
- It has similar semantic to `load_gather`.
+ let description = [{ It (aka. store) stores data to scattered memory locations. The value is
+ typically a 1D vector. But when the chunk size of the TensorDesc is larger than 1, it will be
+ a 2D vector instead. For the later case, dim-1 of the value correspods to the simd lanes
+ and the dim-0 of the value corresponds to the chunk_size stored per lane. So `store_scatter`
+ has transpose effect, which is similar to `load_gather`. Therefore, a transpose attribute is
+ introduced on purpose, making sure users are aware of this implicit transformation.
Example:
```mlir
@@ -592,6 +627,7 @@ def XeGPU_StoreScatterOp : XeGPU_Op<"store", [AllShapesMatch<["value", "TensorDe
XeGPU_ValueType: $value,
XeGPU_TensorDesc: $TensorDesc,
XeGPU_MaskType: $mask,
+ OptionalAttr<UnitAttr>: $transpose,
OptionalAttr<XeGPU_CacheHintAttr>: $l1_hint,
OptionalAttr<XeGPU_CacheHintAttr>: $l2_hint,
OptionalAttr<XeGPU_CacheHintAttr>: $l3_hint);
@@ -723,7 +759,7 @@ def XeGPU_DpasOp : XeGPU_Op<"dpas", [Pure, AllElementTypesMatch<["lhs", "rhs"]>]
def XeGPU_AtomicRMWOp: XeGPU_Op<"atomic_rmw", [Pure,
AllElementTypesMatch<["tensorDesc", "value", "result"]>,
- AllShapesMatch<["tensorDesc", "mask", "value", "result"]>]> {
+ AllShapesMatch<["tensorDesc", "value", "result"]>]> {
let summary = "Atomic ready-modify-write operation on the TensorDesc. ";
let description = [{
@@ -808,7 +844,7 @@ def XeGPU_FenceOp: XeGPU_Op<"fence", []> {
2. `Fence_scope` describes the scope of fence. "Workgroup" means that the scope would be
within each workgroup. "GPU" means the scope would be across workgroups within the GPU.
}];
- let arguments = (ins XeGPU_MemoryScopeAttr: $memory_kind,
+ let arguments = (ins XeGPU_MemorySpaceAttr: $memory_kind,
XeGPU_FenceScopeAttr: $fence_scope);
let assemblyFormat = [{`memory_kind` `=` `` $memory_kind `,` `fence_scope` `=` `` $fence_scope attr-dict}];
let extraClassDeclaration = extraBaseClassDeclaration;
diff --git a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUTypes.td b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUTypes.td
index 9f101a71697b56..0ce1211664b5ba 100644
--- a/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUTypes.td
+++ b/mlir/include/mlir/Dialect/XeGPU/IR/XeGPUTypes.td
@@ -48,7 +48,7 @@ def XeGPU_TensorDesc: XeGPUTypeDef<"TensorDesc", "tensor_desc",
Similar to the builtin tensor, it also provides an optinal attribute to encoding
the following information via the TensorDescAttr object:
- * memory_scope (xegpu::MemoryScope): [optional] where the data is located,
+ * memory_space (xegpu::MemorySpace): [optional] where the data is located,
global memory or shared memory. It is default to Global.
* array_length (int): [optional] The number of contiguous blocks with size as `shape`,
that will be loaded by block load at a time. It is default to 1.
@@ -63,7 +63,7 @@ def XeGPU_TensorDesc: XeGPUTypeDef<"TensorDesc", "tensor_desc",
element-type ::= float-type | integer-type | index-type
dim-list := (static-dim-list `x`)?
static-dim-list ::= decimal-literal `x` decimal-literal
- attr-list = (, memory_scope = value)? (, arr_len = value)? (, boundary_check = value)? (, scattered = value)?
+ attr-list = (, memory_space = value)? (, arr_len = value)? (, boundary_check = value)? (, scattered = value)?
```
Examples:
@@ -76,7 +76,7 @@ def XeGPU_TensorDesc: XeGPUTypeDef<"TensorDesc", "tensor_desc",
xegpu.tensor_desc<8x16xf32>
// A TensorDesc with 8x16 f32 elements for a memory region in shared memory space.
- xegpu.tensor_desc<8x16xf32, #xegpu.tdesc_attr<memory_scope = slm>>
+ xegpu.tensor_desc<8x16xf32, #xegpu.tdesc_attr<memory_space = slm>>
```
}];
@@ -88,11 +88,14 @@ def XeGPU_TensorDesc: XeGPUTypeDef<"TensorDesc", "tensor_desc",
TypeBuilderWithInferredContext<(ins
"llvm::ArrayRef<int64_t>": $shape,
"mlir::Type": $elementType,
- CArg<"bool", "false">: $scattered,
CArg<"int", "1">: $array_length,
- CArg<"xegpu::MemoryScope", "xegpu::MemoryScope::Global">:$memory_scope,
- CArg<"bool", "true">: $boundary_check
- )>
+ CArg<"bool", "true">: $boundary_check,
+ CArg<"xegpu::MemorySpace", "xegpu::MemorySpace::Global">:$memory_space)>,
+ TypeBuilderWithInferredContext<(ins
+ "llvm::ArrayRef<int64_t>": $shape,
+ "mlir::Type": $elementType,
+ CArg<"int", "1">: $chunk_size,
+ CArg<"xegpu::MemorySpace", "xegpu::MemorySpace::Global">:$memory_space)>
];
let extraClassDeclaration = [{
@@ -110,40 +113,58 @@ def XeGPU_TensorDesc: XeGPUTypeDef<"TensorDesc", "tensor_desc",
return llvm::cast<TensorDescType>(cloneWith(getShape(), elementType));
}
- TensorDescAttr getEncodingAsTensorDescAttr() const {
- return llvm::dyn_cast_if_present<TensorDescAttr>(getEncoding());
+ BlockTensorDescAttr getEncodingAsBlockTensorDescAttr() const {
+ return llvm::dyn_cast_if_present<BlockTensorDescAttr>(getEncoding());
}
- xegpu::MemoryScope getMemoryScope() const {
- auto attr = getEncodingAsTensorDescAttr();
- if (attr && attr.getMemoryScope())
- return attr.getMemoryScope().getValue();
+ ScatterTensorDescAttr getEncodingAsScatterTensorDescAttr() const {
+ return llvm::dyn_cast_if_present<ScatterTensorDescAttr>(getEncoding());
+ }
+
+ xegpu::MemorySpace getMemorySpace() const {
+ auto block_attr = getEncodingAsBlockTensorDescAttr();
+ if (block_attr && block_attr.getMemorySpace())
+ return block_attr.getMemorySpace().getValue();
+
+ auto scatter_attr = getEncodingAsScatterTensorDescAttr();
+ if (scatter_attr && scatter_attr.getMemorySpace())
+ return scatter_attr.getMemorySpace().getValue();
+
// return default value
- return MemoryScope::Global;
+ return MemorySpace::Global;
}
int getArrayLength() {
- auto attr = getEncodingAsTensorDescAttr();
- if (attr && attr.getArrayLength())
- return attr.getArrayLength().getInt();
+ auto attr = getEncoding();
+ auto block_attr = mlir::dyn_cast_if_present<BlockTensorDescAttr>(attr);
+ assert((!attr || block_attr) && "invalid on non BlockTensorDescAttr.");
+ if (block_attr && block_attr.getArrayLength())
+ return block_attr.getArrayLength().getInt();
// return default value
return 1;
}
bool getBoundaryCheck() {
- auto attr = getEncodingAsTensorDescAttr();
- if (attr && attr.getBoundaryCheck())
- return attr.getBoundaryCheck().getValue();
+ auto attr = getEncoding();
+ auto block_attr = mlir::dyn_cast_if_present<BlockTensorDescAttr>(attr);
+ assert((!attr || block_attr) && "invalid on non BlockTensorDescAttr.");
+ if (block_attr && block_attr.getBoundaryCheck())
+ return block_attr.getBoundaryCheck().getValue();
// return default value
return true;
}
- bool getScattered() {
- auto attr = getEncodingAsTensorDescAttr();
- if (attr && attr.getScattered())
- return attr.getScattered().getValue();
- // return default value
- return false;
+ bool isScattered() {
+ return bool(getEncodingAsScatterTensorDescAttr());
+ }
+
+ int getChunkSize() {
+ auto attr = getEncoding();
+ auto scatter_attr = mlir::dyn_cast_if_present<ScatterTensorDescAttr>(attr);
+ assert((!attr || scatter_attr) && "invalid on non ScatterTensorDescAttr.");
+ if (scatter_attr && scatter_attr.getChunkSize())
+ return scatter_attr.getChunkSize().getInt();
+ return 1;
}
}];
diff --git a/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp b/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp
index 24719fe748fe4f..1dfbaed454c193 100644
--- a/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp
+++ b/mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp
@@ -30,23 +30,35 @@ void XeGPUDialect::initialize() {
}
//===-------------------------------------------...
[truncated]
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adam-smnk
reviewed
Sep 19, 2024
chencha3
deleted the
users/chencha3/xegpu/update_xegpu_tdesc_attr_and_gather_scatter
branch
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qiaojbao
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Oct 31, 2024
…efb6db236 Local branch amd-gfx 842efb6 Merged main:e0bd8d3485075d24ecff2b4f5d9e2117853bd08b into amd-gfx:44ce984e8f2a Remote branch main 2162723 [MLIR][XeGPU] Updates XeGPU TensorDescAttr and Refine Gather/Scatter definition. (llvm#109144)
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The PR makes the following refine changes to the XeGPU dialect.
TensorDescAttrinto two independent attributes,BlockTensorDescAttrandScatterTensorDescAttrMemoryScopeAttrtoMemorySpaceAttr, and updated the enumeration value for shared memory following OpenCL standard.transposeUnitAttr toStoreScatterOpandLoadGatherOpCreateNdDescandCreateDescop, addes valid and invalid test cases for them.