//===- 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/Operation.h"
#include "mlir/Target/LLVMIR/ModuleTranslation.h"

#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/IntrinsicsAMDGPU.h"

using namespace mlir;
using namespace mlir::LLVM;
using mlir::LLVM::detail::createIntrinsicCall;

// 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 fn_name, int parameter) {
  llvm::Module *module = builder.GetInsertBlock()->getModule();
  llvm::FunctionType *function_type = 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(fn_name, function_type).getCallee());
  llvm::Value *fn_op0 = llvm::ConstantInt::get(
      llvm::Type::getInt32Ty(module->getContext()), parameter);
  return builder.CreateCall(fn, ArrayRef<llvm::Value *>(fn_op0));
}

LogicalResult mlir::ROCDLDialectLLVMIRTranslationInterface::convertOperation(
    Operation *op, llvm::IRBuilderBase &builder,
    LLVM::ModuleTranslation &moduleTranslation) const {
  Operation &opInst = *op;
#include "mlir/Dialect/LLVMIR/ROCDLConversions.inc"

  return failure();
}

LogicalResult mlir::ROCDLDialectLLVMIRTranslationInterface::amendOperation(
    Operation *op, NamedAttribute attribute,
    LLVM::ModuleTranslation &moduleTranslation) const {
  if (attribute.first == ROCDL::ROCDLDialect::getKernelFuncAttrName()) {
    auto func = cast<LLVM::LLVMFuncOp>(op);

    // For GPU kernels,
    // 1. Insert AMDGPU_KERNEL calling convention.
    // 2. Insert amdgpu-flat-workgroup-size(1, 1024) attribute.
    llvm::Function *llvmFunc = moduleTranslation.lookupFunction(func.getName());
    llvmFunc->setCallingConv(llvm::CallingConv::AMDGPU_KERNEL);
    llvmFunc->addFnAttr("amdgpu-flat-work-group-size", "1, 1024");
  }
  return success();
}