llvm/lib/Target/AMDGPU/SIProgramInfo.h

//===--- SIProgramInfo.h ----------------------------------------*- 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
/// Defines struct to track resource usage and hardware flags for kernels and
/// entry functions.
///
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_AMDGPU_SIPROGRAMINFO_H
#define LLVM_LIB_TARGET_AMDGPU_SIPROGRAMINFO_H

#include "llvm/IR/CallingConv.h"
#include "llvm/Support/Compiler.h"
#include <cstdint>
#include <optional>

namespace llvm {

class GCNSubtarget;
class MCContext;
class MCExpr;
class MachineFunction;

/// Track resource usage for kernels / entry functions.
struct LLVM_EXTERNAL_VISIBILITY SIProgramInfo {
  std::optional<uint64_t> CodeSizeInBytes;

  // Fields set in PGM_RSRC1 pm4 packet.
  const MCExpr *VGPRBlocks = nullptr;
  const MCExpr *SGPRBlocks = nullptr;
  uint32_t Priority = 0;
  uint32_t FloatMode = 0;
  uint32_t Priv = 0;
  uint32_t DX10Clamp = 0;
  uint32_t DebugMode = 0;
  uint32_t IEEEMode = 0;
  uint32_t WgpMode = 0;     // GFX10+
  uint32_t MemOrdered = 0;  // GFX10+
  uint32_t FwdProgress = 0; // GFX10+
  uint32_t RrWgMode = 0;    // GFX12+
  const MCExpr *ScratchSize = nullptr;

  // State used to calculate fields set in PGM_RSRC2 pm4 packet.
  uint32_t LDSBlocks = 0;
  const MCExpr *ScratchBlocks = nullptr;

  // Fields set in PGM_RSRC2 pm4 packet
  const MCExpr *ScratchEnable = nullptr;
  uint32_t UserSGPR = 0;
  uint32_t TrapHandlerEnable = 0;
  uint32_t TGIdXEnable = 0;
  uint32_t TGIdYEnable = 0;
  uint32_t TGIdZEnable = 0;
  uint32_t TGSizeEnable = 0;
  uint32_t TIdIGCompCount = 0;
  uint32_t EXCPEnMSB = 0;
  uint32_t LdsSize = 0;
  uint32_t EXCPEnable = 0;

  const MCExpr *ComputePGMRSrc3 = nullptr;

  const MCExpr *NumVGPR = nullptr;
  const MCExpr *NumArchVGPR = nullptr;
  const MCExpr *NumAccVGPR = nullptr;
  const MCExpr *AccumOffset = nullptr;
  uint32_t TgSplit = 0;
  const MCExpr *NumSGPR = nullptr;
  unsigned SGPRSpill = 0;
  unsigned VGPRSpill = 0;
  uint32_t LDSSize = 0;
  const MCExpr *FlatUsed = nullptr;

  // Number of SGPRs that meets number of waves per execution unit request.
  const MCExpr *NumSGPRsForWavesPerEU = nullptr;

  // Number of VGPRs that meets number of waves per execution unit request.
  const MCExpr *NumVGPRsForWavesPerEU = nullptr;

  // Final occupancy.
  const MCExpr *Occupancy = nullptr;

  // Whether there is recursion, dynamic allocas, indirect calls or some other
  // reason there may be statically unknown stack usage.
  const MCExpr *DynamicCallStack = nullptr;

  // Bonus information for debugging.
  const MCExpr *VCCUsed = nullptr;

  SIProgramInfo() = default;

  // The constructor sets the values for each member as shown in the struct.
  // However, setting the MCExpr members to their zero value equivalent
  // happens in reset together with (duplicated) value re-set for the
  // non-MCExpr members.
  void reset(const MachineFunction &MF);

  // Get function code size and cache the value.
  // If \p IsLowerBound is set it returns a minimal code size which is safe
  // to address.
  uint64_t getFunctionCodeSize(const MachineFunction &MF,
                               bool IsLowerBound = false);

  /// Compute the value of the ComputePGMRsrc1 register.
  const MCExpr *getComputePGMRSrc1(const GCNSubtarget &ST,
                                   MCContext &Ctx) const;
  const MCExpr *getPGMRSrc1(CallingConv::ID CC, const GCNSubtarget &ST,
                            MCContext &Ctx) const;

  /// Compute the value of the ComputePGMRsrc2 register.
  const MCExpr *getComputePGMRSrc2(MCContext &Ctx) const;
  const MCExpr *getPGMRSrc2(CallingConv::ID CC, MCContext &Ctx) const;
};

} // namespace llvm

#endif // LLVM_LIB_TARGET_AMDGPU_SIPROGRAMINFO_H