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//===- AMDGPUResourceUsageAnalysis.h ---- analysis of resources -*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
/// \file
/// \brief Analyzes how many registers and other resources are used by
/// functions.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AMDGPU_AMDGPURESOURCEUSAGEANALYSIS_H
#define LLVM_LIB_TARGET_AMDGPU_AMDGPURESOURCEUSAGEANALYSIS_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/IR/PassManager.h"
namespace llvm {
class GCNSubtarget;
class MachineFunction;
class GCNTargetMachine;
struct AMDGPUResourceUsageAnalysisImpl {
public:
static char ID;
// Track resource usage for callee functions.
struct SIFunctionResourceInfo {
// Track the number of explicitly used VGPRs. Special registers reserved at
// the end are tracked separately.
int32_t NumVGPR = 0;
int32_t NumAGPR = 0;
int32_t NumExplicitSGPR = 0;
int32_t NumNamedBarrier = 0;
uint64_t CalleeSegmentSize = 0;
uint64_t PrivateSegmentSize = 0;
bool UsesVCC = false;
bool UsesFlatScratch = false;
bool HasDynamicallySizedStack = false;
bool HasRecursion = false;
bool HasIndirectCall = false;
SmallVector<const Function *, 16> Callees;
};
SIFunctionResourceInfo
analyzeResourceUsage(const MachineFunction &MF,
uint32_t AssumedStackSizeForDynamicSizeObjects,
uint32_t AssumedStackSizeForExternalCall) const;
};
struct AMDGPUResourceUsageAnalysisWrapperPass : public MachineFunctionPass {
using FunctionResourceInfo =
AMDGPUResourceUsageAnalysisImpl::SIFunctionResourceInfo;
FunctionResourceInfo ResourceInfo;
public:
static char ID;
AMDGPUResourceUsageAnalysisWrapperPass() : MachineFunctionPass(ID) {}
bool runOnMachineFunction(MachineFunction &MF) override;
const FunctionResourceInfo &getResourceInfo() const { return ResourceInfo; }
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
MachineFunctionPass::getAnalysisUsage(AU);
}
};
class AMDGPUResourceUsageAnalysis
: public AnalysisInfoMixin<AMDGPUResourceUsageAnalysis> {
friend AnalysisInfoMixin<AMDGPUResourceUsageAnalysis>;
static AnalysisKey Key;
const GCNTargetMachine &TM;
public:
using Result = AMDGPUResourceUsageAnalysisImpl::SIFunctionResourceInfo;
Result run(MachineFunction &MF, MachineFunctionAnalysisManager &MFAM);
AMDGPUResourceUsageAnalysis(const GCNTargetMachine &TM_) : TM(TM_) {}
};
} // namespace llvm
#endif // LLVM_LIB_TARGET_AMDGPU_AMDGPURESOURCEUSAGEANALYSIS_H
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