//===- TestGPUMemoryPromotionPass.cpp - Test pass for GPU promotion -------===//
//
// Part of the MLIR 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 the pass testing the utilities for moving data across
// different levels of the GPU memory hierarchy.
//
//===----------------------------------------------------------------------===//

#include "mlir/Dialect/GPU/GPUDialect.h"
#include "mlir/Dialect/GPU/MemoryPromotion.h"
#include "mlir/IR/Attributes.h"
#include "mlir/Pass/Pass.h"

using namespace mlir;

namespace {
/// Simple pass for testing the promotion to workgroup memory in GPU functions.
/// Promotes all arguments with "gpu.test_promote_workgroup" attribute. This
/// does not check whether the promotion is legal (e.g., amount of memory used)
/// or beneficial (e.g., makes previously uncoalesced loads coalesced).
class TestGpuMemoryPromotionPass
    : public OperationPass<TestGpuMemoryPromotionPass, gpu::GPUFuncOp> {
  void runOnOperation() override {
    gpu::GPUFuncOp op = getOperation();
    for (unsigned i = 0, e = op.getNumArguments(); i < e; ++i) {
      if (op.getArgAttrOfType<UnitAttr>(i, "gpu.test_promote_workgroup"))
        promoteToWorkgroupMemory(op, i);
    }
  }
};
} // end namespace

static PassRegistration<TestGpuMemoryPromotionPass> registration(
    "test-gpu-memory-promotion",
    "Promotes the annotated arguments of gpu.func to workgroup memory.");