[AMDGPU] Move register related queries to subtarget class

[kzhuravl]

Ping.

[kzhuravl]

Bring up to date with trunk.

[arsenm]

lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp

510

Assign to variable and add that here? Should probably reorder this with the STM.debuggerEmitPrologue() part to keep all the register computations together

lib/Target/AMDGPU/AMDGPUSubtarget.cpp

508–510

If you aren't planning on adding more you can do a return ternary operator in the header

[kzhuravl]

Address review feedback.

[arsenm]

LGTM

lib/Target/AMDGPU/SIRegisterInfo.cpp

146–148

Indentation looks wrong

lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp

if (STM.getGeneration() < SISubtarget::VOLCANIC_ISLANDS) {
     if (FlatUsed)
       ExtraSGPRs = 6;
   }
 
   // Record first reserved register and reserved register count fields, and
   // update max register counts if "amdgpu-debugger-reserve-regs" attribute was
   // requested.
   ProgInfo.ReservedVGPRFirst = STM.debuggerReserveRegs() ? MaxVGPR + 1 : 0;
-  ProgInfo.ReservedVGPRCount = RI->getNumDebuggerReservedVGPRs(STM);
+  ProgInfo.ReservedVGPRCount = STM.getReservedNumVGPRs(MF);
 
   // Update DebuggerWavefrontPrivateSegmentOffsetSGPR and
   // DebuggerPrivateSegmentBufferSGPR fields if "amdgpu-debugger-emit-prologue"
   // attribute was requested.
   if (STM.debuggerEmitPrologue()) {
     ProgInfo.DebuggerWavefrontPrivateSegmentOffsetSGPR =
       RI->getHWRegIndex(MFI->getScratchWaveOffsetReg());
     ProgInfo.DebuggerPrivateSegmentBufferSGPR =
       RI->getHWRegIndex(MFI->getScratchRSrcReg());
   }
 
   // Check the addressable register limit before we add ExtraSGPRs.
   if (STM.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS &&
       !STM.hasSGPRInitBug()) {
-    unsigned MaxAddressableNumSGPRs = STM.getMaxNumSGPRs();
+    unsigned MaxAddressableNumSGPRs = STM.getAddressableNumSGPRs();
     if (MaxSGPR + 1 > MaxAddressableNumSGPRs) {
       // This can happen due to a compiler bug or when using inline asm.
       LLVMContext &Ctx = MF.getFunction()->getContext();
       DiagnosticInfoResourceLimit Diag(*MF.getFunction(),
                                        "addressable scalar registers",
                                        MaxSGPR + 1, DS_Error,
                                        DK_ResourceLimit, MaxAddressableNumSGPRs);
       Ctx.diagnose(Diag);
       MaxSGPR = MaxAddressableNumSGPRs - 1;
     }
   }
 
   // Account for extra SGPRs and VGPRs reserved for debugger use.
   MaxSGPR += ExtraSGPRs;
-  MaxVGPR += RI->getNumDebuggerReservedVGPRs(STM);
+  MaxVGPR += STM.getReservedNumVGPRs(MF);
 
   // We found the maximum register index. They start at 0, so add one to get the
   // number of registers.
   ProgInfo.NumVGPR = MaxVGPR + 1;
   ProgInfo.NumSGPR = MaxSGPR + 1;
 
   // Adjust number of registers used to meet default/requested minimum/maximum
   // number of waves per execution unit request.
   ProgInfo.NumSGPRsForWavesPerEU = std::max(
-    ProgInfo.NumSGPR, RI->getMinNumSGPRs(STM, MFI->getMaxWavesPerEU()));
+    ProgInfo.NumSGPR, STM.getMinNumSGPRs(MFI->getMaxWavesPerEU()));
   ProgInfo.NumVGPRsForWavesPerEU = std::max(
-    ProgInfo.NumVGPR, RI->getMinNumVGPRs(MFI->getMaxWavesPerEU()));
+    ProgInfo.NumVGPR, STM.getMinNumVGPRs(MFI->getMaxWavesPerEU()));
 
   if (STM.getGeneration() <= AMDGPUSubtarget::SEA_ISLANDS ||
       STM.hasSGPRInitBug()) {
-    unsigned MaxNumSGPRs = STM.getMaxNumSGPRs();
+    unsigned MaxNumSGPRs = STM.getAddressableNumSGPRs();
     if (ProgInfo.NumSGPR > MaxNumSGPRs) {
       // This can happen due to a compiler bug or when using inline asm to use the
       // registers which are usually reserved for vcc etc.
 
       LLVMContext &Ctx = MF.getFunction()->getContext();
       DiagnosticInfoResourceLimit Diag(*MF.getFunction(),
                                        "scalar registers",
                                        ProgInfo.NumSGPR, DS_Error,
if (MFI->getLDSSize() > static_cast<unsigned>(STM.getLocalMemorySize())) {
     LLVMContext &Ctx = MF.getFunction()->getContext();
     DiagnosticInfoResourceLimit Diag(*MF.getFunction(), "local memory",
                                      MFI->getLDSSize(), DS_Error);
     Ctx.diagnose(Diag);
   }
 
   // SGPRBlocks is actual number of SGPR blocks minus 1.
   ProgInfo.SGPRBlocks = alignTo(ProgInfo.NumSGPRsForWavesPerEU,
-                                RI->getSGPRAllocGranule());
-  ProgInfo.SGPRBlocks = ProgInfo.SGPRBlocks / RI->getSGPRAllocGranule() - 1;
+                                STM.getSGPRAllocGranule());
+  ProgInfo.SGPRBlocks = ProgInfo.SGPRBlocks / STM.getSGPRAllocGranule() - 1;
 
   // VGPRBlocks is actual number of VGPR blocks minus 1.
   ProgInfo.VGPRBlocks = alignTo(ProgInfo.NumVGPRsForWavesPerEU,
-                                RI->getVGPRAllocGranule());
-  ProgInfo.VGPRBlocks = ProgInfo.VGPRBlocks / RI->getVGPRAllocGranule() - 1;
+                                STM.getVGPRAllocGranule());
+  ProgInfo.VGPRBlocks = ProgInfo.VGPRBlocks / STM.getVGPRAllocGranule() - 1;
 
   // Set the value to initialize FP_ROUND and FP_DENORM parts of the mode
   // register.
   ProgInfo.FloatMode = getFPMode(MF);
 
   ProgInfo.IEEEMode = STM.enableIEEEBit(MF);
 
   // Make clamp modifier on NaN input returns 0.

lib/Target/AMDGPU/AMDGPUSubtarget.h

public:
   unsigned getOccupancyWithNumVGPRs(unsigned VGPRs) const;
 
   /// \returns True if waitcnt instruction is needed before barrier instruction,
   /// false otherwise.
   bool needWaitcntBeforeBarrier() const {
     return true;
   }
 
-  unsigned getMaxNumSGPRs() const;
+  /// \returns SGPR allocation granularity supported by the subtarget.
+  unsigned getSGPRAllocGranule() const {
+    return 8;
+  }
+
+  /// \returns Total number of SGPRs supported by the subtarget.
+  unsigned getTotalNumSGPRs() const {
+    if (getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
+      return 800;
+    return 512;
+  }
+
+  /// \returns Addressable number of SGPRs supported by the subtarget.
+  unsigned getAddressableNumSGPRs() const {
+    if (hasSGPRInitBug())
+      return SISubtarget::FIXED_SGPR_COUNT_FOR_INIT_BUG;
+    if (getGeneration() >= VOLCANIC_ISLANDS)
+      return 102;
+    return 104;
+  }
+
+  /// \returns Minimum number of SGPRs that meets the given number of waves per
+  /// execution unit requirement supported by the subtarget.
+  unsigned getMinNumSGPRs(unsigned WavesPerEU) const;
+
+  /// \returns Maximum number of SGPRs that meets the given number of waves per
+  /// execution unit requirement supported by the subtarget.
+  unsigned getMaxNumSGPRs(unsigned WavesPerEU, bool Addressable) const;
+
+  /// \returns Reserved number of SGPRs for given function \p MF.
+  unsigned getReservedNumSGPRs(const MachineFunction &MF) const;
+
+  /// \returns Maximum number of SGPRs that meets number of waves per execution
+  /// unit requirement for function \p MF, or number of SGPRs explicitly
+  /// requested using "amdgpu-num-sgpr" attribute attached to function \p MF.
+  ///
+  /// \returns Value that meets number of waves per execution unit requirement
+  /// if explicitly requested value cannot be converted to integer, violates
+  /// subtarget's specifications, or does not meet number of waves per execution
+  /// unit requirement.
+  unsigned getMaxNumSGPRs(const MachineFunction &MF) const;
+
+  /// \returns VGPR allocation granularity supported by the subtarget.
+  unsigned getVGPRAllocGranule() const {
+    return 4;
+  }
+
+  /// \returns Total number of VGPRs supported by the subtarget.
+  unsigned getTotalNumVGPRs() const {
+    return 256;
+  }
+
+  /// \returns Addressable number of VGPRs supported by the subtarget.
+  unsigned getAddressableNumVGPRs() const {
+    return getTotalNumVGPRs();
+  }
+
+  /// \returns Minimum number of VGPRs that meets given number of waves per
+  /// execution unit requirement supported by the subtarget.
+  unsigned getMinNumVGPRs(unsigned WavesPerEU) const;
+
+  /// \returns Maximum number of VGPRs that meets given number of waves per
+  /// execution unit requirement supported by the subtarget.
+  unsigned getMaxNumVGPRs(unsigned WavesPerEU) const;
+
+  /// \returns Reserved number of VGPRs for given function \p MF.
+  unsigned getReservedNumVGPRs(const MachineFunction &MF) const;
+
+  /// \returns Maximum number of VGPRs that meets number of waves per execution
+  /// unit requirement for function \p MF, or number of VGPRs explicitly
+  /// requested using "amdgpu-num-vgpr" attribute attached to function \p MF.
+  ///
+  /// \returns Value that meets number of waves per execution unit requirement
+  /// if explicitly requested value cannot be converted to integer, violates
+  /// subtarget's specifications, or does not meet number of waves per execution
+  /// unit requirement.
+  unsigned getMaxNumVGPRs(const MachineFunction &MF) const;
 };
 
 } // end namespace llvm
 
 #endif // LLVM_LIB_TARGET_AMDGPU_AMDGPUSUBTARGET_H

lib/Target/AMDGPU/AMDGPUSubtarget.cpp

 //===-- AMDGPUSubtarget.cpp - AMDGPU Subtarget Information ----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
 /// \brief Implements the AMDGPU specific subclass of TargetSubtarget.
 //
 //===----------------------------------------------------------------------===//
 
 #include "AMDGPUSubtarget.h"
+#include "SIMachineFunctionInfo.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/CodeGen/MachineScheduler.h"
 #include "llvm/Target/TargetFrameLowering.h"
 #include <algorithm>
 
 using namespace llvm;
 
 #define DEBUG_TYPE "amdgpu-subtarget"
if (VGPRs <= 64)
     return 4;
   if (VGPRs <= 84)
     return 3;
   if (VGPRs <= 128)
     return 2;
   return 1;
 }
 
-unsigned SISubtarget::getMaxNumSGPRs() const {
+unsigned SISubtarget::getMinNumSGPRs(unsigned WavesPerEU) const {
+  if (getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) {
+    switch (WavesPerEU) {
+      case 0:  return 0;
+      case 10: return 0;
+      case 9:  return 0;
+      case 8:  return 81;
+      default: return 97;
+    }
+  } else {
+    switch (WavesPerEU) {
+      case 0:  return 0;
+      case 10: return 0;
+      case 9:  return 49;
+      case 8:  return 57;
+      case 7:  return 65;
+      case 6:  return 73;
+      case 5:  return 81;
+      default: return 97;
+    }
+  }
+}
+
+unsigned SISubtarget::getMaxNumSGPRs(unsigned WavesPerEU,
+                                     bool Addressable) const {
+  if (getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) {
+    switch (WavesPerEU) {
+      case 0:  return 80;
+      case 10: return 80;
+      case 9:  return 80;
+      case 8:  return 96;
+      default: return Addressable ? getAddressableNumSGPRs() : 112;
+    }
+  } else {
+    switch (WavesPerEU) {
+      case 0:  return 48;
+      case 10: return 48;
+      case 9:  return 56;
+      case 8:  return 64;
+      case 7:  return 72;
+      case 6:  return 80;
+      case 5:  return 96;
+      default: return getAddressableNumSGPRs();
+    }
+  }
+}
+
+unsigned SISubtarget::getReservedNumSGPRs(const MachineFunction &MF) const {
+  const SIMachineFunctionInfo &MFI = *MF.getInfo<SIMachineFunctionInfo>();
+  if (MFI.hasFlatScratchInit()) {
+    if (getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
+      return 6; // FLAT_SCRATCH, XNACK, VCC (in that order).
+    if (getGeneration() == AMDGPUSubtarget::SEA_ISLANDS)
+      return 4; // FLAT_SCRATCH, VCC (in that order).
+  }
+
+  if (isXNACKEnabled())
+    return 4; // XNACK, VCC (in that order).
+  return 2; // VCC.
+}
+
+unsigned SISubtarget::getMaxNumSGPRs(const MachineFunction &MF) const {
+  const Function &F = *MF.getFunction();
+  const SIMachineFunctionInfo &MFI = *MF.getInfo<SIMachineFunctionInfo>();
+
+  // Compute maximum number of SGPRs function can use using default/requested
+  // minimum number of waves per execution unit.
+  std::pair<unsigned, unsigned> WavesPerEU = MFI.getWavesPerEU();
+  unsigned MaxNumSGPRs = getMaxNumSGPRs(WavesPerEU.first, false);
+  unsigned MaxAddressableNumSGPRs = getMaxNumSGPRs(WavesPerEU.first, true);
+
+  // Check if maximum number of SGPRs was explicitly requested using
+  // "amdgpu-num-sgpr" attribute.
+  if (F.hasFnAttribute("amdgpu-num-sgpr")) {
+    unsigned Requested = AMDGPU::getIntegerAttribute(
+      F, "amdgpu-num-sgpr", MaxNumSGPRs);
+
+    // Make sure requested value does not violate subtarget's specifications.
+    if (Requested && (Requested <= getReservedNumSGPRs(MF)))
+      Requested = 0;
+
+    // If more SGPRs are required to support the input user/system SGPRs,
+    // increase to accommodate them.
+    //
+    // FIXME: This really ends up using the requested number of SGPRs + number
+    // of reserved special registers in total. Theoretically you could re-use
+    // the last input registers for these special registers, but this would
+    // require a lot of complexity to deal with the weird aliasing.
+    unsigned InputNumSGPRs = MFI.getNumPreloadedSGPRs();
+    if (Requested && Requested < InputNumSGPRs)
+      Requested = InputNumSGPRs;
+
+    // Make sure requested value is compatible with values implied by
+    // default/requested minimum/maximum number of waves per execution unit.
+    if (Requested && Requested > getMaxNumSGPRs(WavesPerEU.first, false))
+      Requested = 0;
+    if (WavesPerEU.second &&
+        Requested && Requested < getMinNumSGPRs(WavesPerEU.second))
+      Requested = 0;
+
+    if (Requested)
+      MaxNumSGPRs = Requested;
+  }
+
   if (hasSGPRInitBug())
-    return SISubtarget::FIXED_SGPR_COUNT_FOR_INIT_BUG;
+    MaxNumSGPRs = SISubtarget::FIXED_SGPR_COUNT_FOR_INIT_BUG;
+
+  return std::min(MaxNumSGPRs - getReservedNumSGPRs(MF),
+                  MaxAddressableNumSGPRs);
+}
+
+unsigned SISubtarget::getMinNumVGPRs(unsigned WavesPerEU) const {
+  switch (WavesPerEU) {
+    case 0:  return 0;
+    case 10: return 0;
+    case 9:  return 25;
+    case 8:  return 29;
+    case 7:  return 33;
+    case 6:  return 37;
+    case 5:  return 41;
+    case 4:  return 49;
+    case 3:  return 65;
+    case 2:  return 85;
+    default: return 129;
+  }
+}
+
+unsigned SISubtarget::getMaxNumVGPRs(unsigned WavesPerEU) const {
+  switch (WavesPerEU) {
+    case 0:  return 24;
+    case 10: return 24;
+    case 9:  return 28;
+    case 8:  return 32;
+    case 7:  return 36;
+    case 6:  return 40;
+    case 5:  return 48;
+    case 4:  return 64;
+    case 3:  return 84;
+    case 2:  return 128;
+    default: return getTotalNumVGPRs();
+  }
+}
+
+unsigned SISubtarget::getReservedNumVGPRs(const MachineFunction &MF) const {
+  if (debuggerReserveRegs())
+    return 4;
+  return 0;
+}
+
+unsigned SISubtarget::getMaxNumVGPRs(const MachineFunction &MF) const {
+  const Function &F = *MF.getFunction();
+  const SIMachineFunctionInfo &MFI = *MF.getInfo<SIMachineFunctionInfo>();
 
-  if (getGeneration() >= VOLCANIC_ISLANDS)
-    return 102;
+  // Compute maximum number of VGPRs function can use using default/requested
+  // minimum number of waves per execution unit.
+  std::pair<unsigned, unsigned> WavesPerEU = MFI.getWavesPerEU();
+  unsigned MaxNumVGPRs = getMaxNumVGPRs(WavesPerEU.first);
+
+  // Check if maximum number of VGPRs was explicitly requested using
+  // "amdgpu-num-vgpr" attribute.
+  if (F.hasFnAttribute("amdgpu-num-vgpr")) {
+    unsigned Requested = AMDGPU::getIntegerAttribute(
+      F, "amdgpu-num-vgpr", MaxNumVGPRs);
+
+    // Make sure requested value does not violate subtarget's specifications.
+    if (Requested && Requested <= getReservedNumVGPRs(MF))
+      Requested = 0;
+
+    // Make sure requested value is compatible with values implied by
+    // default/requested minimum/maximum number of waves per execution unit.
+    if (Requested && Requested > getMaxNumVGPRs(WavesPerEU.first))
+      Requested = 0;
+    if (WavesPerEU.second &&
+        Requested && Requested < getMinNumVGPRs(WavesPerEU.second))
+      Requested = 0;
+
+    if (Requested)
+      MaxNumVGPRs = Requested;
+  }
 
-  return 104;
+  return MaxNumVGPRs - getReservedNumVGPRs(MF);
 }

lib/Target/AMDGPU/GCNSchedStrategy.cpp

void GCNMaxOccupancySchedStrategy::pickNodeFromQueue(SchedBoundary &Zone,
   ArrayRef<unsigned> Pressure = RPTracker.getRegSetPressureAtPos();
   unsigned SGPRPressure = Pressure[SRI->getSGPRPressureSet()];
   unsigned VGPRPressure = Pressure[SRI->getVGPRPressureSet()];
   unsigned SGPRExcessLimit =
       Context->RegClassInfo->getNumAllocatableRegs(&AMDGPU::SGPR_32RegClass);
   unsigned VGPRExcessLimit =
       Context->RegClassInfo->getNumAllocatableRegs(&AMDGPU::VGPR_32RegClass);
   unsigned MaxWaves = getMaxWaves(SGPRPressure, VGPRPressure, DAG->MF);
-  unsigned SGPRCriticalLimit = SRI->getMaxNumSGPRs(ST, MaxWaves, true);
-  unsigned VGPRCriticalLimit = SRI->getMaxNumVGPRs(MaxWaves);
+  unsigned SGPRCriticalLimit = ST.getMaxNumSGPRs(MaxWaves, true);
+  unsigned VGPRCriticalLimit = ST.getMaxNumVGPRs(MaxWaves);
 
   ReadyQueue &Q = Zone.Available;
   for (SUnit *SU : Q) {
 
     SchedCandidate TryCand(ZonePolicy);
     initCandidate(TryCand, SU, Zone.isTop(), RPTracker, SRI,
                   SGPRPressure, VGPRPressure,
                   SGPRExcessLimit, VGPRExcessLimit,

lib/Target/AMDGPU/SIFrameLowering.cpp

 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/RegisterScavenging.h"
 
 using namespace llvm;
 
 
-static ArrayRef<MCPhysReg> getAllSGPR128(const MachineFunction &MF,
-                                         const SIRegisterInfo *TRI) {
+static ArrayRef<MCPhysReg> getAllSGPR128(const SISubtarget &ST,
+                                         const MachineFunction &MF) {
   return makeArrayRef(AMDGPU::SGPR_128RegClass.begin(),
-                      TRI->getMaxNumSGPRs(MF) / 4);
+                      ST.getMaxNumSGPRs(MF) / 4);
 }
 
-static ArrayRef<MCPhysReg> getAllSGPRs(const MachineFunction &MF,
-                                       const SIRegisterInfo *TRI) {
+static ArrayRef<MCPhysReg> getAllSGPRs(const SISubtarget &ST,
+                                       const MachineFunction &MF) {
   return makeArrayRef(AMDGPU::SGPR_32RegClass.begin(),
-                      TRI->getMaxNumSGPRs(MF));
+                      ST.getMaxNumSGPRs(MF));
 }
 
 void SIFrameLowering::emitFlatScratchInit(const SIInstrInfo *TII,
                                           const SIRegisterInfo* TRI,
                                           MachineFunction &MF,
                                           MachineBasicBlock &MBB) const {
   // We don't need this if we only have spills since there is no user facing
   // scratch.
unsigned SIFrameLowering::getReservedPrivateSegmentBufferReg(
   // cannot do this for the resources required for scratch access. For now we
   // skip over user SGPRs and may leave unused holes.
 
   // We find the resource first because it has an alignment requirement.
 
   MachineRegisterInfo &MRI = MF.getRegInfo();
 
   unsigned NumPreloaded = (MFI->getNumPreloadedSGPRs() + 3) / 4;
-  ArrayRef<MCPhysReg> AllSGPR128s = getAllSGPR128(MF, TRI);
+  ArrayRef<MCPhysReg> AllSGPR128s = getAllSGPR128(ST, MF);
   AllSGPR128s = AllSGPR128s.slice(std::min(static_cast<unsigned>(AllSGPR128s.size()), NumPreloaded));
 
   // Skip the last 2 elements because the last one is reserved for VCC, and
   // this is the 2nd to last element already.
   for (MCPhysReg Reg : AllSGPR128s) {
     // Pick the first unallocated one. Make sure we don't clobber the other
     // reserved input we needed.
     if (!MRI.isPhysRegUsed(Reg) && MRI.isAllocatable(Reg)) {
if (ST.hasSGPRInitBug() ||
       ScratchWaveOffsetReg != TRI->reservedPrivateSegmentWaveByteOffsetReg(MF))
     return ScratchWaveOffsetReg;
 
   unsigned ScratchRsrcReg = MFI->getScratchRSrcReg();
   MachineRegisterInfo &MRI = MF.getRegInfo();
 
   unsigned NumPreloaded = MFI->getNumPreloadedSGPRs();
 
-  ArrayRef<MCPhysReg> AllSGPRs = getAllSGPRs(MF, TRI);
+  ArrayRef<MCPhysReg> AllSGPRs = getAllSGPRs(ST, MF);
   if (NumPreloaded > AllSGPRs.size())
     return ScratchWaveOffsetReg;
 
   AllSGPRs = AllSGPRs.slice(NumPreloaded);
 
   // We need to drop register from the end of the list that we cannot use
   // for the scratch wave offset.
   // + 2 s102 and s103 do not exist on VI.

lib/Target/AMDGPU/SIRegisterInfo.h

public:
 
   bool isSGPRPressureSet(unsigned SetID) const {
     return SGPRPressureSets.test(SetID) && !VGPRPressureSets.test(SetID);
   }
   bool isVGPRPressureSet(unsigned SetID) const {
     return VGPRPressureSets.test(SetID) && !SGPRPressureSets.test(SetID);
   }
 
-  /// \returns SGPR allocation granularity supported by the subtarget.
-  unsigned getSGPRAllocGranule() const {
-    return 8;
-  }
-
-  /// \returns Total number of SGPRs supported by the subtarget.
-  unsigned getTotalNumSGPRs(const SISubtarget &ST) const;
-
-  /// \returns Number of addressable SGPRs supported by the subtarget.
-  unsigned getNumAddressableSGPRs(const SISubtarget &ST) const;
-
-  /// \returns Number of reserved SGPRs supported by the subtarget.
-  unsigned getNumReservedSGPRs(const SISubtarget &ST,
-                               const SIMachineFunctionInfo &MFI) const;
-
-  /// \returns Minimum number of SGPRs that meets given number of waves per
-  /// execution unit requirement for given subtarget.
-  unsigned getMinNumSGPRs(const SISubtarget &ST, unsigned WavesPerEU) const;
-
-  /// \returns Maximum number of SGPRs that meets given number of waves per
-  /// execution unit requirement for given subtarget.
-  unsigned getMaxNumSGPRs(const SISubtarget &ST, unsigned WavesPerEU,
-                          bool Addressable) const;
-
-  /// \returns Maximum number of SGPRs that meets number of waves per execution
-  /// unit requirement for function \p MF, or number of SGPRs explicitly
-  /// requested using "amdgpu-num-sgpr" attribute attached to function \p MF.
-  ///
-  /// \returns Value that meets number of waves per execution unit requirement
-  /// if explicitly requested value cannot be converted to integer, violates
-  /// subtarget's specifications, or does not meet number of waves per execution
-  /// unit requirement.
-  unsigned getMaxNumSGPRs(const MachineFunction &MF) const;
-
-  /// \returns VGPR allocation granularity supported by the subtarget.
-  unsigned getVGPRAllocGranule() const {
-    return 4;
-  }
-
-  /// \returns Total number of VGPRs supported by the subtarget.
-  unsigned getTotalNumVGPRs() const {
-    return 256;
-  }
-
-  /// \returns Number of reserved VGPRs for debugger use supported by the
-  /// subtarget.
-  unsigned getNumDebuggerReservedVGPRs(const SISubtarget &ST) const;
-
-  /// \returns Minimum number of SGPRs that meets given number of waves per
-  /// execution unit requirement.
-  unsigned getMinNumVGPRs(unsigned WavesPerEU) const;
-
-  /// \returns Maximum number of VGPRs that meets given number of waves per
-  /// execution unit requirement.
-  unsigned getMaxNumVGPRs(unsigned WavesPerEU) const;
-
-  /// \returns Maximum number of VGPRs that meets number of waves per execution
-  /// unit requirement for function \p MF, or number of VGPRs explicitly
-  /// requested using "amdgpu-num-vgpr" attribute attached to function \p MF.
-  ///
-  /// \returns Value that meets number of waves per execution unit requirement
-  /// if explicitly requested value cannot be converted to integer, violates
-  /// subtarget's specifications, or does not meet number of waves per execution
-  /// unit requirement.
-  unsigned getMaxNumVGPRs(const MachineFunction &MF) const;
-
   ArrayRef<int16_t> getRegSplitParts(const TargetRegisterClass *RC,
                                      unsigned EltSize) const;
 
   bool shouldCoalesce(MachineInstr *MI,
                       const TargetRegisterClass *SrcRC,
                       unsigned SubReg,
                       const TargetRegisterClass *DstRC,
                       unsigned DstSubReg,

lib/Target/AMDGPU/SIRegisterInfo.cpp

void SIRegisterInfo::reserveRegisterTuples(BitVector &Reserved, unsigned Reg) const {
   MCRegAliasIterator R(Reg, this, true);
 
   for (; R.isValid(); ++R)
     Reserved.set(*R);
 }
 
 unsigned SIRegisterInfo::reservedPrivateSegmentBufferReg(
   const MachineFunction &MF) const {
-  unsigned BaseIdx = alignDown(getMaxNumSGPRs(MF), 4) - 4;
+
+  const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
+  unsigned BaseIdx = alignDown(ST.getMaxNumSGPRs(MF), 4) - 4;
   unsigned BaseReg(AMDGPU::SGPR_32RegClass.getRegister(BaseIdx));
   return getMatchingSuperReg(BaseReg, AMDGPU::sub0, &AMDGPU::SReg_128RegClass);
 }
 
 unsigned SIRegisterInfo::reservedPrivateSegmentWaveByteOffsetReg(
   const MachineFunction &MF) const {
-  unsigned RegCount = getMaxNumSGPRs(MF);
+
+  const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
+  unsigned RegCount = ST.getMaxNumSGPRs(MF);
   unsigned Reg;
 
   // Try to place it in a hole after PrivateSegmentbufferReg.
   if (RegCount & 3) {
     // We cannot put the segment buffer in (Idx - 4) ... (Idx - 1) due to
     // alignment constraints, so we have a hole where can put the wave offset.
     Reg = RegCount - 1;
   } else {
BitVector SIRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
   reserveRegisterTuples(Reserved, AMDGPU::TMA);
   reserveRegisterTuples(Reserved, AMDGPU::TTMP0_TTMP1);
   reserveRegisterTuples(Reserved, AMDGPU::TTMP2_TTMP3);
   reserveRegisterTuples(Reserved, AMDGPU::TTMP4_TTMP5);
   reserveRegisterTuples(Reserved, AMDGPU::TTMP6_TTMP7);
   reserveRegisterTuples(Reserved, AMDGPU::TTMP8_TTMP9);
   reserveRegisterTuples(Reserved, AMDGPU::TTMP10_TTMP11);
 
-  unsigned MaxNumSGPRs = getMaxNumSGPRs(MF);
+  const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
+
+  unsigned MaxNumSGPRs = ST.getMaxNumSGPRs(MF);
   unsigned TotalNumSGPRs = AMDGPU::SGPR_32RegClass.getNumRegs();
   for (unsigned i = MaxNumSGPRs; i < TotalNumSGPRs; ++i) {
     unsigned Reg = AMDGPU::SGPR_32RegClass.getRegister(i);
     reserveRegisterTuples(Reserved, Reg);
   }
 
-  unsigned MaxNumVGPRs = getMaxNumVGPRs(MF);
+  unsigned MaxNumVGPRs = ST.getMaxNumVGPRs(MF);
   unsigned TotalNumVGPRs = AMDGPU::VGPR_32RegClass.getNumRegs();
   for (unsigned i = MaxNumVGPRs; i < TotalNumVGPRs; ++i) {
     unsigned Reg = AMDGPU::VGPR_32RegClass.getRegister(i);
     reserveRegisterTuples(Reserved, Reg);
   }
 
   const SIMachineFunctionInfo *MFI = MF.getInfo<SIMachineFunctionInfo>();
 
SIRegisterInfo::findUnusedRegister(const MachineRegisterInfo &MRI,
                                    const MachineFunction &MF) const {
 
   for (unsigned Reg : *RC)
     if (MRI.isAllocatable(Reg) && !MRI.isPhysRegUsed(Reg))
       return Reg;
   return AMDGPU::NoRegister;
 }
 
-unsigned SIRegisterInfo::getTotalNumSGPRs(const SISubtarget &ST) const {
-  if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
-    return 800;
-  return 512;
-}
-
-unsigned SIRegisterInfo::getNumAddressableSGPRs(const SISubtarget &ST) const {
-  if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
-    return 102;
-  return 104;
-}
-
-unsigned SIRegisterInfo::getNumReservedSGPRs(const SISubtarget &ST,
-                                             const SIMachineFunctionInfo &MFI) const {
-  if (MFI.hasFlatScratchInit()) {
-    if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
-      return 6; // FLAT_SCRATCH, XNACK, VCC (in that order)
-
-    if (ST.getGeneration() == AMDGPUSubtarget::SEA_ISLANDS)
-      return 4; // FLAT_SCRATCH, VCC (in that order)
-  }
-
-  if (ST.isXNACKEnabled())
-    return 4; // XNACK, VCC (in that order)
-
-  return 2; // VCC.
-}
-
-unsigned SIRegisterInfo::getMinNumSGPRs(const SISubtarget &ST,
-                                        unsigned WavesPerEU) const {
-  if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) {
-    switch (WavesPerEU) {
-      case 0:  return 0;
-      case 10: return 0;
-      case 9:  return 0;
-      case 8:  return 81;
-      default: return 97;
-    }
-  } else {
-    switch (WavesPerEU) {
-      case 0:  return 0;
-      case 10: return 0;
-      case 9:  return 49;
-      case 8:  return 57;
-      case 7:  return 65;
-      case 6:  return 73;
-      case 5:  return 81;
-      default: return 97;
-    }
-  }
-}
-
-unsigned SIRegisterInfo::getMaxNumSGPRs(const SISubtarget &ST,
-                                        unsigned WavesPerEU,
-                                        bool Addressable) const {
-  if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS) {
-    switch (WavesPerEU) {
-      case 0:  return 80;
-      case 10: return 80;
-      case 9:  return 80;
-      case 8:  return 96;
-      default: return Addressable ? getNumAddressableSGPRs(ST) : 112;
-    }
-  } else {
-    switch (WavesPerEU) {
-      case 0:  return 48;
-      case 10: return 48;
-      case 9:  return 56;
-      case 8:  return 64;
-      case 7:  return 72;
-      case 6:  return 80;
-      case 5:  return 96;
-      default: return getNumAddressableSGPRs(ST);
-    }
-  }
-}
-
-unsigned SIRegisterInfo::getMaxNumSGPRs(const MachineFunction &MF) const {
-  const Function &F = *MF.getFunction();
-
-  const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
-  const SIMachineFunctionInfo &MFI = *MF.getInfo<SIMachineFunctionInfo>();
-
-  // Compute maximum number of SGPRs function can use using default/requested
-  // minimum number of waves per execution unit.
-  std::pair<unsigned, unsigned> WavesPerEU = MFI.getWavesPerEU();
-  unsigned MaxNumSGPRs = getMaxNumSGPRs(ST, WavesPerEU.first, false);
-  unsigned MaxNumAddressableSGPRs = getMaxNumSGPRs(ST, WavesPerEU.first, true);
-
-  // Check if maximum number of SGPRs was explicitly requested using
-  // "amdgpu-num-sgpr" attribute.
-  if (F.hasFnAttribute("amdgpu-num-sgpr")) {
-    unsigned Requested = AMDGPU::getIntegerAttribute(
-      F, "amdgpu-num-sgpr", MaxNumSGPRs);
-
-    // Make sure requested value does not violate subtarget's specifications.
-    if (Requested && (Requested <= getNumReservedSGPRs(ST, MFI)))
-      Requested = 0;
-
-    // If more SGPRs are required to support the input user/system SGPRs,
-    // increase to accommodate them.
-    //
-    // FIXME: This really ends up using the requested number of SGPRs + number
-    // of reserved special registers in total. Theoretically you could re-use
-    // the last input registers for these special registers, but this would
-    // require a lot of complexity to deal with the weird aliasing.
-    unsigned NumInputSGPRs = MFI.getNumPreloadedSGPRs();
-    if (Requested && Requested < NumInputSGPRs)
-      Requested = NumInputSGPRs;
-
-    // Make sure requested value is compatible with values implied by
-    // default/requested minimum/maximum number of waves per execution unit.
-    if (Requested && Requested > getMaxNumSGPRs(ST, WavesPerEU.first, false))
-      Requested = 0;
-    if (WavesPerEU.second &&
-        Requested && Requested < getMinNumSGPRs(ST, WavesPerEU.second))
-      Requested = 0;
-
-    if (Requested)
-      MaxNumSGPRs = Requested;
-  }
-
-  if (ST.hasSGPRInitBug())
-    MaxNumSGPRs = SISubtarget::FIXED_SGPR_COUNT_FOR_INIT_BUG;
-
-  return std::min(MaxNumSGPRs - getNumReservedSGPRs(ST, MFI),
-                  MaxNumAddressableSGPRs);
-}
-
-unsigned SIRegisterInfo::getNumDebuggerReservedVGPRs(
-  const SISubtarget &ST) const {
-  if (ST.debuggerReserveRegs())
-    return 4;
-  return 0;
-}
-
-unsigned SIRegisterInfo::getMinNumVGPRs(unsigned WavesPerEU) const {
-  switch (WavesPerEU) {
-    case 0:  return 0;
-    case 10: return 0;
-    case 9:  return 25;
-    case 8:  return 29;
-    case 7:  return 33;
-    case 6:  return 37;
-    case 5:  return 41;
-    case 4:  return 49;
-    case 3:  return 65;
-    case 2:  return 85;
-    default: return 129;
-  }
-}
-
-unsigned SIRegisterInfo::getMaxNumVGPRs(unsigned WavesPerEU) const {
-  switch (WavesPerEU) {
-    case 0:  return 24;
-    case 10: return 24;
-    case 9:  return 28;
-    case 8:  return 32;
-    case 7:  return 36;
-    case 6:  return 40;
-    case 5:  return 48;
-    case 4:  return 64;
-    case 3:  return 84;
-    case 2:  return 128;
-    default: return getTotalNumVGPRs();
-  }
-}
-
-unsigned SIRegisterInfo::getMaxNumVGPRs(const MachineFunction &MF) const {
-  const Function &F = *MF.getFunction();
-
-  const SISubtarget &ST = MF.getSubtarget<SISubtarget>();
-  const SIMachineFunctionInfo &MFI = *MF.getInfo<SIMachineFunctionInfo>();
-
-  // Compute maximum number of VGPRs function can use using default/requested
-  // minimum number of waves per execution unit.
-  std::pair<unsigned, unsigned> WavesPerEU = MFI.getWavesPerEU();
-  unsigned MaxNumVGPRs = getMaxNumVGPRs(WavesPerEU.first);
-
-  // Check if maximum number of VGPRs was explicitly requested using
-  // "amdgpu-num-vgpr" attribute.
-  if (F.hasFnAttribute("amdgpu-num-vgpr")) {
-    unsigned Requested = AMDGPU::getIntegerAttribute(
-      F, "amdgpu-num-vgpr", MaxNumVGPRs);
-
-    // Make sure requested value does not violate subtarget's specifications.
-    if (Requested && Requested <= getNumDebuggerReservedVGPRs(ST))
-      Requested = 0;
-
-    // Make sure requested value is compatible with values implied by
-    // default/requested minimum/maximum number of waves per execution unit.
-    if (Requested && Requested > getMaxNumVGPRs(WavesPerEU.first))
-      Requested = 0;
-    if (WavesPerEU.second &&
-        Requested && Requested < getMinNumVGPRs(WavesPerEU.second))
-      Requested = 0;
-
-    if (Requested)
-      MaxNumVGPRs = Requested;
-  }
-
-  return MaxNumVGPRs - getNumDebuggerReservedVGPRs(ST);
-}
-
 ArrayRef<int16_t> SIRegisterInfo::getRegSplitParts(const TargetRegisterClass *RC,
                                                    unsigned EltSize) const {
   if (EltSize == 4) {
     static const int16_t Sub0_15[] = {
       AMDGPU::sub0, AMDGPU::sub1, AMDGPU::sub2, AMDGPU::sub3,
       AMDGPU::sub4, AMDGPU::sub5, AMDGPU::sub6, AMDGPU::sub7,
       AMDGPU::sub8, AMDGPU::sub9, AMDGPU::sub10, AMDGPU::sub11,
       AMDGPU::sub12, AMDGPU::sub13, AMDGPU::sub14, AMDGPU::sub15,