[Mlir-commits] [mlir] [MLIR][LLVM] Attach kernel metadata representation to `llvm.func` (PR #101314)
Victor Perez
llvmlistbot at llvm.org
Wed Jul 31 03:06:16 PDT 2024
https://github.com/victor-eds created https://github.com/llvm/llvm-project/pull/101314
Add optional attributes to `llvm.func` representing LLVM so-called "kernel" metadata:
- [`vec_type_hint`](https://clang.llvm.org/docs/AttributeReference.html#vec-type-hint)
- [`work_group_size_hint`](https://clang.llvm.org/docs/AttributeReference.html#work-group-size-hint)
- [`reqd_work_group_size`](https://clang.llvm.org/docs/AttributeReference.html#reqd-work-group-size)
- [`intel_reqd_sub_group_size`](https://clang.llvm.org/docs/AttributeReference.html#intel-reqd-sub-group-size).
>From 3744c1a3f8b801d7e459e25ee9d31a385fe13cdf Mon Sep 17 00:00:00 2001
From: Victor Perez <victor.perez at codeplay.com>
Date: Wed, 31 Jul 2024 10:49:26 +0100
Subject: [PATCH] [MLIR][LLVM] Attach kernel metadata representation to
`llvm.func`
Add optional attributes to `llvm.func` representing LLVM so-called
"kernel" metadata:
- [`vec_type_hint`](https://clang.llvm.org/docs/AttributeReference.html#vec-type-hint)
- [`work_group_size_hint`](https://clang.llvm.org/docs/AttributeReference.html#work-group-size-hint)
- [`reqd_work_group_size`](https://clang.llvm.org/docs/AttributeReference.html#reqd-work-group-size)
- [`intel_reqd_sub_group_size`](https://clang.llvm.org/docs/AttributeReference.html#intel-reqd-sub-group-size).
Signed-off-by: Victor Perez <victor.perez at codeplay.com>
---
.../mlir/Dialect/LLVMIR/LLVMAttrDefs.td | 11 +++
mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td | 7 +-
mlir/lib/Target/LLVMIR/ModuleImport.cpp | 97 +++++++++++++++++++
mlir/lib/Target/LLVMIR/ModuleTranslation.cpp | 75 ++++++++++++++
mlir/test/Dialect/LLVMIR/func.mlir | 42 +++++++-
.../Target/LLVMIR/Import/metadata-kernel.ll | 34 +++++++
mlir/test/Target/LLVMIR/llvmir.mlir | 44 +++++++++
7 files changed, 308 insertions(+), 2 deletions(-)
create mode 100644 mlir/test/Target/LLVMIR/Import/metadata-kernel.ll
diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
index 695a962bcab9b..0ecd2dcacffc1 100644
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
@@ -1071,6 +1071,17 @@ def LLVM_UndefAttr : LLVM_Attr<"Undef", "undef">;
/// Folded into from LLVM::PoisonOp.
def LLVM_PoisonAttr : LLVM_Attr<"Poison", "poison">;
+//===----------------------------------------------------------------------===//
+// VecTypeHintAttr
+//===----------------------------------------------------------------------===//
+
+/// Represents "vec_type_hint" values
+def LLVM_VecTypeHintAttr : LLVM_Attr<"VecTypeHint", "vec_type_hint"> {
+ let parameters = (ins "TypeAttr":$hint,
+ DefaultValuedParameter<"bool", "false">:$is_signed);
+ let assemblyFormat = "`<` struct(params) `>`";
+}
+
//===----------------------------------------------------------------------===//
// ZeroAttr
//===----------------------------------------------------------------------===//
diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
index 260d42185b57f..fde42682d807a 100644
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
@@ -1456,7 +1456,12 @@ def LLVM_LLVMFuncOp : LLVM_Op<"func", [
OptionalAttr<UnitAttr>:$always_inline,
OptionalAttr<UnitAttr>:$no_unwind,
OptionalAttr<UnitAttr>:$will_return,
- OptionalAttr<UnitAttr>:$optimize_none
+ OptionalAttr<UnitAttr>:$optimize_none,
+ // Kernel metadata
+ OptionalAttr<LLVM_VecTypeHintAttr>:$vec_type_hint,
+ OptionalAttr<DenseI32ArrayAttr>:$work_group_size_hint,
+ OptionalAttr<DenseI32ArrayAttr>:$reqd_work_group_size,
+ OptionalAttr<I32Attr>:$intel_reqd_sub_group_size
);
let regions = (region AnyRegion:$body);
diff --git a/mlir/lib/Target/LLVMIR/ModuleImport.cpp b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
index 8b40b7b2df6c7..cb18dc5193352 100644
--- a/mlir/lib/Target/LLVMIR/ModuleImport.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
@@ -1918,6 +1918,99 @@ void ModuleImport::convertParameterAttributes(llvm::Function *func,
builder.getArrayAttr(convertParameterAttribute(llvmResAttr, builder)));
}
+/// Extract constant integer value from metadata if this is constant. Return
+/// `std::nullopt` otherwise.
+static std::optional<int32_t> parseIntegerMD(llvm::Metadata *md) {
+ if (!md)
+ return {};
+
+ auto *c = dyn_cast<llvm::ConstantAsMetadata>(md);
+ if (!c)
+ return {};
+
+ auto *ci = dyn_cast<llvm::ConstantInt>(c->getValue());
+ if (!ci)
+ return {};
+
+ return ci->getValue().getSExtValue();
+}
+
+/// Convert an `MDNode` to an LLVM dialect `VecTypeHintAttr` if possible.
+template <typename ConvertType>
+static VecTypeHintAttr convertVecTypeHint(Builder builder, llvm::MDNode *md,
+ ConvertType convertType) {
+ if (!md || md->getNumOperands() != 2)
+ return {};
+
+ auto *hintMD = dyn_cast<llvm::ValueAsMetadata>(md->getOperand(0).get());
+ if (!hintMD)
+ return {};
+ TypeAttr hint = TypeAttr::get(convertType(hintMD->getType()));
+
+ std::optional<int32_t> optIsSigned = parseIntegerMD(md->getOperand(1).get());
+ if (!optIsSigned)
+ return {};
+ bool isSigned = *optIsSigned != 0;
+
+ return builder.getAttr<VecTypeHintAttr>(hint, isSigned);
+}
+
+/// Convert an `MDNode` to an MLIR `DenseI32ArrayAttr` if possible.
+static DenseI32ArrayAttr convertDenseI32Array(Builder builder,
+ llvm::MDNode *md) {
+ if (!md)
+ return {};
+ SmallVector<int32_t> vals;
+ for (const llvm::MDOperand &op : md->operands()) {
+ std::optional<int32_t> mdValue = parseIntegerMD(op.get());
+ if (!mdValue)
+ return {};
+ vals.push_back(*mdValue);
+ }
+ return builder.getDenseI32ArrayAttr(vals);
+}
+
+/// Convert an `MDNode` to an MLIR `IntegerAttr` if possible.
+static IntegerAttr convertIntegerMD(Builder builder, llvm::MDNode *md) {
+ if (!md || md->getNumOperands() != 1)
+ return {};
+ std::optional<int32_t> val = parseIntegerMD(md->getOperand(0));
+ if (!val)
+ return {};
+ return builder.getI32IntegerAttr(*val);
+}
+
+/// Process metadata found in kernel functions:
+/// - `vec_type_hint`
+/// - `work_group_size_hint`
+/// - `reqd_work_group_size`
+/// - `intel_reqd_sub_group_size`
+template <typename ConvertType>
+static void processKernelMetadata(llvm::Function *func, LLVMFuncOp funcOp,
+ ConvertType convertType) {
+ Builder builder(funcOp);
+
+ if (VecTypeHintAttr attr = convertVecTypeHint(
+ builder, func->getMetadata("vec_type_hint"), convertType)) {
+ funcOp.setVecTypeHintAttr(attr);
+ }
+
+ if (DenseI32ArrayAttr attr = convertDenseI32Array(
+ builder, func->getMetadata("work_group_size_hint"))) {
+ funcOp.setWorkGroupSizeHintAttr(attr);
+ }
+
+ if (DenseI32ArrayAttr attr = convertDenseI32Array(
+ builder, func->getMetadata("reqd_work_group_size"))) {
+ funcOp.setReqdWorkGroupSizeAttr(attr);
+ }
+
+ if (IntegerAttr attr = convertIntegerMD(
+ builder, func->getMetadata("intel_reqd_sub_group_size"))) {
+ funcOp.setIntelReqdSubGroupSizeAttr(attr);
+ }
+}
+
LogicalResult ModuleImport::processFunction(llvm::Function *func) {
clearRegionState();
@@ -1966,6 +2059,10 @@ LogicalResult ModuleImport::processFunction(llvm::Function *func) {
// Handle Function attributes.
processFunctionAttributes(func, funcOp);
+ // Handle Kernel Metadata
+ processKernelMetadata(func, funcOp,
+ [this](llvm::Type *type) { return convertType(type); });
+
// Convert non-debug metadata by using the dialect interface.
SmallVector<std::pair<unsigned, llvm::MDNode *>> allMetadata;
func->getAllMetadata(allMetadata);
diff --git a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
index 3016d1846e00f..00ca8bdbf0c23 100644
--- a/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleTranslation.cpp
@@ -1247,6 +1247,41 @@ static LogicalResult checkedAddLLVMFnAttribute(Location loc,
return success();
}
+/// Return a representation of `value` as metadata.
+static llvm::Metadata *convertIntegerToMetadata(llvm::LLVMContext &context,
+ const llvm::APInt &value) {
+ llvm::Constant *constant = llvm::ConstantInt::get(context, value);
+ return llvm::ConstantAsMetadata::get(constant);
+}
+
+/// Return a representation of `value` as an MDNode.
+static llvm::MDNode *convertIntegerToMDNode(llvm::LLVMContext &context,
+ const llvm::APInt &value) {
+ return llvm::MDNode::get(context, convertIntegerToMetadata(context, value));
+}
+
+/// Return an MDNode encoding `vec_type_hint` metadata.
+static llvm::MDNode *convertVecTypeHintToMDNode(llvm::LLVMContext &context,
+ llvm::Type *type,
+ bool isSigned) {
+ llvm::Metadata *typeMD =
+ llvm::ConstantAsMetadata::get(llvm::UndefValue::get(type));
+ llvm::Metadata *isSignedMD =
+ convertIntegerToMetadata(context, llvm::APInt(32, isSigned ? 1 : 0));
+ return llvm::MDNode::get(context, {typeMD, isSignedMD});
+}
+
+/// Return an MDNode with a tuple given by the values in the input integer array
+/// attribute.
+static llvm::MDNode *convertIntegerArrayToMDNode(llvm::LLVMContext &context,
+ ArrayRef<int32_t> values) {
+ llvm::SmallVector<llvm::Metadata *> mds;
+ llvm::transform(values, std::back_inserter(mds), [&context](int32_t value) {
+ return convertIntegerToMetadata(context, llvm::APInt(32, value));
+ });
+ return llvm::MDNode::get(context, mds);
+}
+
/// Attaches the attributes listed in the given array attribute to `llvmFunc`.
/// Reports error to `loc` if any and returns immediately. Expects `attributes`
/// to be an array attribute containing either string attributes, treated as
@@ -1448,6 +1483,42 @@ static void convertFunctionAttributes(LLVMFuncOp func,
convertFunctionMemoryAttributes(func, llvmFunc);
}
+/// Converts function attributes from `func` and attaches them to `llvmFunc`.
+template <typename TypeConverter>
+static void convertFunctionKernelAttributes(LLVMFuncOp func,
+ llvm::Function *llvmFunc,
+ TypeConverter convertType) {
+ llvm::LLVMContext &llvmContext = llvmFunc->getContext();
+
+ if (auto vecTypeHint = func.getVecTypeHint()) {
+ Type type = vecTypeHint->getHint().getValue();
+ llvm::Type *llvmType = convertType(type);
+ bool isSigned = vecTypeHint->getIsSigned();
+ llvmFunc->setMetadata(
+ "vec_type_hint",
+ convertVecTypeHintToMDNode(llvmContext, llvmType, isSigned));
+ }
+
+ if (auto workGroupSizeHint = func.getWorkGroupSizeHint()) {
+ llvmFunc->setMetadata(
+ "work_group_size_hint",
+ convertIntegerArrayToMDNode(llvmContext, *workGroupSizeHint));
+ }
+
+ if (auto reqdWorkGroupSize = func.getReqdWorkGroupSize()) {
+ llvmFunc->setMetadata(
+ "reqd_work_group_size",
+ convertIntegerArrayToMDNode(llvmContext, *reqdWorkGroupSize));
+ }
+
+ if (auto intelReqdSubGroupSize = func.getIntelReqdSubGroupSize()) {
+ llvmFunc->setMetadata(
+ "intel_reqd_sub_group_size",
+ convertIntegerToMDNode(llvmContext,
+ llvm::APInt(32, *intelReqdSubGroupSize)));
+ }
+}
+
FailureOr<llvm::AttrBuilder>
ModuleTranslation::convertParameterAttrs(LLVMFuncOp func, int argIdx,
DictionaryAttr paramAttrs) {
@@ -1492,6 +1563,10 @@ LogicalResult ModuleTranslation::convertFunctionSignatures() {
// Convert function attributes.
convertFunctionAttributes(function, llvmFunc);
+ // Convert function kernel attributes to metadata
+ convertFunctionKernelAttributes(
+ function, llvmFunc, [this](Type type) { return convertType(type); });
+
// Convert function_entry_count attribute to metadata.
if (std::optional<uint64_t> entryCount = function.getFunctionEntryCount())
llvmFunc->setEntryCount(entryCount.value());
diff --git a/mlir/test/Dialect/LLVMIR/func.mlir b/mlir/test/Dialect/LLVMIR/func.mlir
index 0e29a548de72f..40b4e49f08a3e 100644
--- a/mlir/test/Dialect/LLVMIR/func.mlir
+++ b/mlir/test/Dialect/LLVMIR/func.mlir
@@ -1,6 +1,6 @@
// RUN: mlir-opt -split-input-file -verify-diagnostics %s | mlir-opt | FileCheck %s
// RUN: mlir-opt -split-input-file -verify-diagnostics -mlir-print-op-generic %s | FileCheck %s --check-prefix=GENERIC
-// RUN: mlir-opt -split-input-file -verify-diagnostics %s -mlir-print-debuginfo | mlir-opt -mlir-print-debuginfo | FileCheck %s --check-prefix=LOCINFO
+// RUN: mlir-opt -split-input-file -verify-diagnostics -mlir-print-debuginfo %s | mlir-opt -split-input-file -mlir-print-debuginfo | FileCheck %s --check-prefix=LOCINFO
// RUN: mlir-translate -mlir-to-llvmir -split-input-file -verify-diagnostics %s | FileCheck %s --check-prefix=CHECK-LLVM
module {
@@ -432,3 +432,43 @@ module {
// expected-error @below {{failed to parse CConvAttr parameter 'CallingConv' which is to be a `CConv`}}
}) {sym_name = "generic_unknown_calling_convention", CConv = #llvm.cconv<cc_12>, function_type = !llvm.func<i64 (i64, i64)>} : () -> ()
}
+
+// -----
+
+// CHECK: @vec_type_hint()
+// CHECK-SAME: vec_type_hint = #llvm.vec_type_hint<hint = i32>
+llvm.func @vec_type_hint() attributes {vec_type_hint = #llvm.vec_type_hint<hint = i32>}
+
+// CHECK: @vec_type_hint_signed()
+// CHECK-SAME: vec_type_hint = #llvm.vec_type_hint<hint = i32, is_signed = true>
+llvm.func @vec_type_hint_signed() attributes {vec_type_hint = #llvm.vec_type_hint<hint = i32, is_signed = true>}
+
+// CHECK: @vec_type_hint_signed_vec()
+// CHECK-SAME: vec_type_hint = #llvm.vec_type_hint<hint = vector<2xi32>, is_signed = true>
+llvm.func @vec_type_hint_signed_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<2xi32>, is_signed = true>}
+
+// CHECK: @vec_type_hint_float_vec()
+// CHECK-SAME: vec_type_hint = #llvm.vec_type_hint<hint = vector<3xf32>>
+llvm.func @vec_type_hint_float_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<3xf32>>}
+
+// CHECK: @vec_type_hint_bfloat_vec()
+// CHECK-SAME: vec_type_hint = #llvm.vec_type_hint<hint = vector<8xbf16>>
+llvm.func @vec_type_hint_bfloat_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<8xbf16>>}
+
+// -----
+
+// CHECK: @work_group_size_hint()
+// CHECK-SAME: work_group_size_hint = array<i32: 128, 128, 128>
+llvm.func @work_group_size_hint() attributes {work_group_size_hint = array<i32: 128, 128, 128>}
+
+// -----
+
+// CHECK: @reqd_work_group_size_hint()
+// CHECK-SAME: reqd_work_group_size = array<i32: 128, 256, 128>
+llvm.func @reqd_work_group_size_hint() attributes {reqd_work_group_size = array<i32: 128, 256, 128>}
+
+// -----
+
+// CHECK: @intel_reqd_sub_group_size_hint()
+// CHECK-SAME: intel_reqd_sub_group_size = 32 : i32
+llvm.func @intel_reqd_sub_group_size_hint() attributes {llvm.intel_reqd_sub_group_size = 32 : i32}
diff --git a/mlir/test/Target/LLVMIR/Import/metadata-kernel.ll b/mlir/test/Target/LLVMIR/Import/metadata-kernel.ll
new file mode 100644
index 0000000000000..963e40348c795
--- /dev/null
+++ b/mlir/test/Target/LLVMIR/Import/metadata-kernel.ll
@@ -0,0 +1,34 @@
+; RUN: mlir-translate -import-llvm %s | FileCheck %s
+
+; CHECK: llvm.func @vec_type_hint() attributes {vec_type_hint = #llvm.vec_type_hint<hint = i32>}
+declare !vec_type_hint !0 void @vec_type_hint()
+
+; CHECK: llvm.func @vec_type_hint_signed() attributes {vec_type_hint = #llvm.vec_type_hint<hint = i32, is_signed = true>}
+declare !vec_type_hint !1 void @vec_type_hint_signed()
+
+; CHECK: llvm.func @vec_type_hint_signed_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<2xi32>, is_signed = true>}
+declare !vec_type_hint !2 void @vec_type_hint_signed_vec()
+
+; CHECK: llvm.func @vec_type_hint_float_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<3xf32>>}
+declare !vec_type_hint !3 void @vec_type_hint_float_vec()
+
+; CHECK: llvm.func @vec_type_hint_bfloat_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<8xbf16>>}
+declare !vec_type_hint !4 void @vec_type_hint_bfloat_vec()
+
+; CHECK: llvm.func @work_group_size_hint() attributes {work_group_size_hint = array<i32: 128, 128, 128>}
+declare !work_group_size_hint !5 void @work_group_size_hint()
+
+; CHECK: llvm.func @reqd_work_group_size() attributes {reqd_work_group_size = array<i32: 128, 256, 128>}
+declare !reqd_work_group_size !6 void @reqd_work_group_size()
+
+; CHECK: llvm.func @intel_reqd_sub_group_size() attributes {intel_reqd_sub_group_size = 32 : i32}
+declare !intel_reqd_sub_group_size !7 void @intel_reqd_sub_group_size()
+
+!0 = !{i32 undef, i32 0}
+!1 = !{i32 undef, i32 1}
+!2 = !{<2 x i32> undef, i32 1}
+!3 = !{<3 x float> undef, i32 0}
+!4 = !{<8 x bfloat> undef, i32 0}
+!5 = !{i32 128, i32 128, i32 128}
+!6 = !{i32 128, i32 256, i32 128}
+!7 = !{i32 32}
diff --git a/mlir/test/Target/LLVMIR/llvmir.mlir b/mlir/test/Target/LLVMIR/llvmir.mlir
index db54d131299c6..8c2efa3d16f6b 100644
--- a/mlir/test/Target/LLVMIR/llvmir.mlir
+++ b/mlir/test/Target/LLVMIR/llvmir.mlir
@@ -2549,3 +2549,47 @@ llvm.func @mem_effects_call() {
// CHECK-SAME: memory(read, inaccessiblemem: write)
// CHECK: #[[ATTRS_3]]
// CHECK-SAME: memory(readwrite, argmem: read)
+
+// -----
+
+// CHECK: declare !vec_type_hint ![[#VEC_TYPE_HINT:]] void @vec_type_hint()
+llvm.func @vec_type_hint() attributes {vec_type_hint = #llvm.vec_type_hint<hint = i32>}
+
+// CHECK: declare !vec_type_hint ![[#VEC_TYPE_HINT_SIGNED:]] void @vec_type_hint_signed()
+llvm.func @vec_type_hint_signed() attributes {vec_type_hint = #llvm.vec_type_hint<hint = i32, is_signed = true>}
+
+// CHECK: declare !vec_type_hint ![[#VEC_TYPE_HINT_SIGNED_VEC:]] void @vec_type_hint_signed_vec()
+llvm.func @vec_type_hint_signed_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<2xi32>, is_signed = true>}
+
+// CHECK: declare !vec_type_hint ![[#VEC_TYPE_HINT_FVEC:]] void @vec_type_hint_float_vec()
+llvm.func @vec_type_hint_float_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<3xf32>>}
+
+// CHECK: declare !vec_type_hint ![[#VEC_TYPE_HINT_BFVEC:]] void @vec_type_hint_bfloat_vec()
+llvm.func @vec_type_hint_bfloat_vec() attributes {vec_type_hint = #llvm.vec_type_hint<hint = vector<8xbf16>>}
+
+// CHECK: ![[#VEC_TYPE_HINT]] = !{i32 undef, i32 0}
+// CHECK: ![[#VEC_TYPE_HINT_SIGNED]] = !{i32 undef, i32 1}
+// CHECK: ![[#VEC_TYPE_HINT_SIGNED_VEC]] = !{<2 x i32> undef, i32 1}
+// CHECK: ![[#VEC_TYPE_HINT_FVEC]] = !{<3 x float> undef, i32 0}
+// CHECK: ![[#VEC_TYPE_HINT_BFVEC]] = !{<8 x bfloat> undef, i32 0}
+
+// -----
+
+// CHECK: declare !work_group_size_hint ![[#WORK_GROUP_SIZE_HINT:]] void @work_group_size_hint()
+llvm.func @work_group_size_hint() attributes {work_group_size_hint = array<i32: 128, 128, 128>}
+
+// CHECK: ![[#WORK_GROUP_SIZE_HINT]] = !{i32 128, i32 128, i32 128}
+
+// -----
+
+// CHECK: declare !reqd_work_group_size ![[#REQD_WORK_GROUP_SIZE:]] void @reqd_work_group_size()
+llvm.func @reqd_work_group_size() attributes {reqd_work_group_size = array<i32: 128, 256, 128>}
+
+// CHECK: ![[#REQD_WORK_GROUP_SIZE]] = !{i32 128, i32 256, i32 128}
+
+// -----
+
+// CHECK: declare !intel_reqd_sub_group_size ![[#INTEL_REQD_SUB_GROUP_SIZE:]] void @intel_reqd_sub_group_size()
+llvm.func @intel_reqd_sub_group_size() attributes {intel_reqd_sub_group_size = 32 : i32}
+
+// CHECK: ![[#INTEL_REQD_SUB_GROUP_SIZE]] = !{i32 32}
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