c3e56cd12c
nvvm.shfl.sync.bfly optionally returns a predicate whether source lane was active. Support for this was added to clang in https://reviews.llvm.org/D68892. Add an optional 'pred' unit attribute to the instruction to return this predicate. Specify this attribute in the partial warp reduction so we don't need to manually compute the predicate. PiperOrigin-RevId: 275616564
115 lines
4.2 KiB
C++
115 lines
4.2 KiB
C++
//===- ConvertToNVVMIR.cpp - MLIR to LLVM IR conversion -------------------===//
|
|
//
|
|
// Copyright 2019 The MLIR Authors.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
// =============================================================================
|
|
//
|
|
// This file implements a translation between the MLIR LLVM + NVVM dialects and
|
|
// LLVM IR with NVVM intrinsics and metadata.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "mlir/Target/NVVMIR.h"
|
|
|
|
#include "mlir/Dialect/GPU/GPUDialect.h"
|
|
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
|
|
#include "mlir/Dialect/LLVMIR/NVVMDialect.h"
|
|
#include "mlir/IR/Module.h"
|
|
#include "mlir/Target/LLVMIR/ModuleTranslation.h"
|
|
#include "mlir/Translation.h"
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/Support/ToolOutputFile.h"
|
|
|
|
using namespace mlir;
|
|
|
|
namespace {
|
|
static llvm::Value *createIntrinsicCall(llvm::IRBuilder<> &builder,
|
|
llvm::Intrinsic::ID intrinsic,
|
|
ArrayRef<llvm::Value *> args = {}) {
|
|
llvm::Module *module = builder.GetInsertBlock()->getModule();
|
|
llvm::Function *fn = llvm::Intrinsic::getDeclaration(module, intrinsic);
|
|
return builder.CreateCall(fn, args);
|
|
}
|
|
|
|
static llvm::Intrinsic::ID getShflBflyIntrinsicId(llvm::Type *resultType,
|
|
bool withPredicate) {
|
|
if (withPredicate) {
|
|
resultType = cast<llvm::StructType>(resultType)->getElementType(0);
|
|
return resultType->isFloatTy() ? llvm::Intrinsic::nvvm_shfl_sync_bfly_f32p
|
|
: llvm::Intrinsic::nvvm_shfl_sync_bfly_i32p;
|
|
}
|
|
return resultType->isFloatTy() ? llvm::Intrinsic::nvvm_shfl_sync_bfly_f32
|
|
: llvm::Intrinsic::nvvm_shfl_sync_bfly_i32;
|
|
}
|
|
|
|
class ModuleTranslation : public LLVM::ModuleTranslation {
|
|
|
|
public:
|
|
explicit ModuleTranslation(ModuleOp module)
|
|
: LLVM::ModuleTranslation(module) {}
|
|
~ModuleTranslation() override {}
|
|
|
|
protected:
|
|
LogicalResult convertOperation(Operation &opInst,
|
|
llvm::IRBuilder<> &builder) override {
|
|
|
|
#include "mlir/Dialect/LLVMIR/NVVMConversions.inc"
|
|
|
|
return LLVM::ModuleTranslation::convertOperation(opInst, builder);
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
std::unique_ptr<llvm::Module> mlir::translateModuleToNVVMIR(ModuleOp m) {
|
|
ModuleTranslation translation(m);
|
|
auto llvmModule =
|
|
LLVM::ModuleTranslation::translateModule<ModuleTranslation>(m);
|
|
if (!llvmModule)
|
|
return llvmModule;
|
|
|
|
// Insert the nvvm.annotations kernel so that the NVVM backend recognizes the
|
|
// function as a kernel.
|
|
for (auto func : m.getOps<LLVM::LLVMFuncOp>()) {
|
|
if (!gpu::GPUDialect::isKernel(func))
|
|
continue;
|
|
|
|
auto *llvmFunc = llvmModule->getFunction(func.getName());
|
|
|
|
llvm::Metadata *llvmMetadata[] = {
|
|
llvm::ValueAsMetadata::get(llvmFunc),
|
|
llvm::MDString::get(llvmModule->getContext(), "kernel"),
|
|
llvm::ValueAsMetadata::get(llvm::ConstantInt::get(
|
|
llvm::Type::getInt32Ty(llvmModule->getContext()), 1))};
|
|
llvm::MDNode *llvmMetadataNode =
|
|
llvm::MDNode::get(llvmModule->getContext(), llvmMetadata);
|
|
llvmModule->getOrInsertNamedMetadata("nvvm.annotations")
|
|
->addOperand(llvmMetadataNode);
|
|
}
|
|
|
|
return llvmModule;
|
|
}
|
|
|
|
static TranslateFromMLIRRegistration
|
|
registration("mlir-to-nvvmir",
|
|
[](ModuleOp module, llvm::raw_ostream &output) {
|
|
auto llvmModule = mlir::translateModuleToNVVMIR(module);
|
|
if (!llvmModule)
|
|
return failure();
|
|
|
|
llvmModule->print(output, nullptr);
|
|
return success();
|
|
});
|