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//===- ROCDLToLLVMIRTranslation.cpp - Translate ROCDL to LLVM IR ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements a translation between the MLIR ROCDL dialect and
// LLVM IR.
//
//===----------------------------------------------------------------------===//
#include "mlir/Target/LLVMIR/Dialect/ROCDL/ROCDLToLLVMIRTranslation.h"
#include "mlir/Dialect/LLVMIR/ROCDLDialect.h"
#include "mlir/IR/BuiltinAttributes.h"
#include "mlir/IR/Operation.h"
#include "mlir/Target/LLVMIR/ModuleTranslation.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicsAMDGPU.h"
#include "llvm/Support/raw_ostream.h"
using namespace mlir;
using namespace mlir::LLVM;
using mlir::LLVM::detail::createIntrinsicCall;
static llvm::Value *createIntrinsicCallWithRange(llvm::IRBuilderBase &builder,
llvm::Intrinsic::ID intrinsic,
DenseI32ArrayAttr maybeRange) {
auto *inst = llvm::cast<llvm::CallInst>(
createIntrinsicCall(builder, intrinsic, {}, {}));
if (maybeRange) {
llvm::ConstantRange Range(APInt(32, maybeRange[0]),
APInt(32, maybeRange[1]));
inst->addRangeRetAttr(Range);
}
return inst;
}
// Create a call to ROCm-Device-Library function
// Currently this routine will work only for calling ROCDL functions that
// take a single int32 argument. It is likely that the interface of this
// function will change to make it more generic.
static llvm::Value *createDeviceFunctionCall(llvm::IRBuilderBase &builder,
StringRef fnName, int parameter) {
llvm::Module *module = builder.GetInsertBlock()->getModule();
llvm::FunctionType *functionType = llvm::FunctionType::get(
llvm::Type::getInt64Ty(module->getContext()), // return type.
llvm::Type::getInt32Ty(module->getContext()), // parameter type.
false); // no variadic arguments.
llvm::Function *fn = dyn_cast<llvm::Function>(
module->getOrInsertFunction(fnName, functionType).getCallee());
llvm::Value *fnOp0 = llvm::ConstantInt::get(
llvm::Type::getInt32Ty(module->getContext()), parameter);
return builder.CreateCall(fn, ArrayRef<llvm::Value *>(fnOp0));
}
namespace {
/// Implementation of the dialect interface that converts operations belonging
/// to the ROCDL dialect to LLVM IR.
class ROCDLDialectLLVMIRTranslationInterface
: public LLVMTranslationDialectInterface {
public:
using LLVMTranslationDialectInterface::LLVMTranslationDialectInterface;
/// Translates the given operation to LLVM IR using the provided IR builder
/// and saving the state in `moduleTranslation`.
LogicalResult
convertOperation(Operation *op, llvm::IRBuilderBase &builder,
LLVM::ModuleTranslation &moduleTranslation) const final {
Operation &opInst = *op;
#include "mlir/Dialect/LLVMIR/ROCDLConversions.inc"
return failure();
}
/// Attaches module-level metadata for functions marked as kernels.
LogicalResult
amendOperation(Operation *op, ArrayRef<llvm::Instruction *> instructions,
NamedAttribute attribute,
LLVM::ModuleTranslation &moduleTranslation) const final {
auto *dialect = dyn_cast<ROCDL::ROCDLDialect>(attribute.getNameDialect());
if (dialect->getKernelAttrHelper().getName() == attribute.getName()) {
auto func = dyn_cast<LLVM::LLVMFuncOp>(op);
if (!func)
return op->emitOpError(Twine(attribute.getName()) +
" is only supported on `llvm.func` operations");
;
// For GPU kernels,
// 1. Insert AMDGPU_KERNEL calling convention.
// 2. Insert amdgpu-flat-work-group-size(1, 256) attribute unless the user
// has overriden this value - 256 is the default in clang
llvm::Function *llvmFunc =
moduleTranslation.lookupFunction(func.getName());
llvmFunc->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL);
if (!llvmFunc->hasFnAttribute("amdgpu-flat-work-group-size")) {
llvmFunc->addFnAttr("amdgpu-flat-work-group-size", "1,256");
}
// MLIR's GPU kernel APIs all assume and produce uniformly-sized
// workgroups, so the lowering of the `rocdl.kernel` marker encodes this
// assumption. This assumption may be overridden by setting
// `rocdl.uniform_work_group_size` on a given function.
if (!llvmFunc->hasFnAttribute("uniform-work-group-size"))
llvmFunc->addFnAttr("uniform-work-group-size", "true");
}
// Override flat-work-group-size
// TODO: update clients to rocdl.flat_work_group_size instead,
// then remove this half of the branch
if (dialect->getMaxFlatWorkGroupSizeAttrHelper().getName() ==
attribute.getName()) {
auto func = dyn_cast<LLVM::LLVMFuncOp>(op);
if (!func)
return op->emitOpError(Twine(attribute.getName()) +
" is only supported on `llvm.func` operations");
auto value = dyn_cast<IntegerAttr>(attribute.getValue());
if (!value)
return op->emitOpError(Twine(attribute.getName()) +
" must be an integer");
llvm::Function *llvmFunc =
moduleTranslation.lookupFunction(func.getName());
llvm::SmallString<8> llvmAttrValue;
llvm::raw_svector_ostream attrValueStream(llvmAttrValue);
attrValueStream << "1," << value.getInt();
llvmFunc->addFnAttr("amdgpu-flat-work-group-size", llvmAttrValue);
}
if (dialect->getFlatWorkGroupSizeAttrHelper().getName() ==
attribute.getName()) {
auto func = dyn_cast<LLVM::LLVMFuncOp>(op);
if (!func)
return op->emitOpError(Twine(attribute.getName()) +
" is only supported on `llvm.func` operations");
auto value = dyn_cast<StringAttr>(attribute.getValue());
if (!value)
return op->emitOpError(Twine(attribute.getName()) +
" must be a string");
llvm::Function *llvmFunc =
moduleTranslation.lookupFunction(func.getName());
llvm::SmallString<8> llvmAttrValue;
llvmAttrValue.append(value.getValue());
llvmFunc->addFnAttr("amdgpu-flat-work-group-size", llvmAttrValue);
}
if (ROCDL::ROCDLDialect::getUniformWorkGroupSizeAttrName() ==
attribute.getName()) {
auto func = dyn_cast<LLVM::LLVMFuncOp>(op);
if (!func)
return op->emitOpError(Twine(attribute.getName()) +
" is only supported on `llvm.func` operations");
auto value = dyn_cast<BoolAttr>(attribute.getValue());
if (!value)
return op->emitOpError(Twine(attribute.getName()) +
" must be a boolean");
llvm::Function *llvmFunc =
moduleTranslation.lookupFunction(func.getName());
llvmFunc->addFnAttr("uniform-work-group-size",
value.getValue() ? "true" : "false");
}
// Set reqd_work_group_size metadata
if (dialect->getReqdWorkGroupSizeAttrHelper().getName() ==
attribute.getName()) {
auto func = dyn_cast<LLVM::LLVMFuncOp>(op);
if (!func)
return op->emitOpError(Twine(attribute.getName()) +
" is only supported on `llvm.func` operations");
auto value = dyn_cast<DenseI32ArrayAttr>(attribute.getValue());
if (!value)
return op->emitOpError(Twine(attribute.getName()) +
" must be a dense i32 array attribute");
llvm::LLVMContext &llvmContext = moduleTranslation.getLLVMContext();
SmallVector<llvm::Metadata *, 3> metadata;
llvm::Type *i32 = llvm::IntegerType::get(llvmContext, 32);
for (int32_t i : value.asArrayRef()) {
llvm::Constant *constant = llvm::ConstantInt::get(i32, i);
metadata.push_back(llvm::ConstantAsMetadata::get(constant));
}
llvm::Function *llvmFunc =
moduleTranslation.lookupFunction(func.getName());
llvm::MDNode *node = llvm::MDNode::get(llvmContext, metadata);
llvmFunc->setMetadata("reqd_work_group_size", node);
}
return success();
}
};
} // namespace
void mlir::registerROCDLDialectTranslation(DialectRegistry ®istry) {
registry.insert<ROCDL::ROCDLDialect>();
registry.addExtension(+[](MLIRContext *ctx, ROCDL::ROCDLDialect *dialect) {
dialect->addInterfaces<ROCDLDialectLLVMIRTranslationInterface>();
});
}
void mlir::registerROCDLDialectTranslation(MLIRContext &context) {
DialectRegistry registry;
registerROCDLDialectTranslation(registry);
context.appendDialectRegistry(registry);
}
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