1//===-- XCoreMachineFunctionInfo.cpp - XCore machine function info --------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#include "XCoreMachineFunctionInfo.h" 10#include "XCoreInstrInfo.h" 11#include "llvm/CodeGen/TargetSubtargetInfo.h" 12#include "llvm/IR/Function.h" 13 14using namespace llvm; 15 16void XCoreFunctionInfo::anchor() { } 17 18bool XCoreFunctionInfo::isLargeFrame(const MachineFunction &MF) const { 19 if (CachedEStackSize == -1) { 20 CachedEStackSize = MF.getFrameInfo().estimateStackSize(MF); 21 } 22 // isLargeFrame() is used when deciding if spill slots should be added to 23 // allow eliminateFrameIndex() to scavenge registers. 24 // This is only required when there is no FP and offsets are greater than 25 // ~256KB (~64Kwords). Thus only for code run on the emulator! 26 // 27 // The arbitrary value of 0xf000 allows frames of up to ~240KB before spill 28 // slots are added for the use of eliminateFrameIndex() register scavenging. 29 // For frames less than 240KB, it is assumed that there will be less than 30 // 16KB of function arguments. 31 return CachedEStackSize > 0xf000; 32} 33 34int XCoreFunctionInfo::createLRSpillSlot(MachineFunction &MF) { 35 if (LRSpillSlotSet) { 36 return LRSpillSlot; 37 } 38 const TargetRegisterClass &RC = XCore::GRRegsRegClass; 39 const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo(); 40 MachineFrameInfo &MFI = MF.getFrameInfo(); 41 if (! MF.getFunction().isVarArg()) { 42 // A fixed offset of 0 allows us to save / restore LR using entsp / retsp. 43 LRSpillSlot = MFI.CreateFixedObject(TRI.getSpillSize(RC), 0, true); 44 } else { 45 LRSpillSlot = MFI.CreateStackObject(TRI.getSpillSize(RC), 46 TRI.getSpillAlign(RC), true); 47 } 48 LRSpillSlotSet = true; 49 return LRSpillSlot; 50} 51 52int XCoreFunctionInfo::createFPSpillSlot(MachineFunction &MF) { 53 if (FPSpillSlotSet) { 54 return FPSpillSlot; 55 } 56 const TargetRegisterClass &RC = XCore::GRRegsRegClass; 57 const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo(); 58 MachineFrameInfo &MFI = MF.getFrameInfo(); 59 FPSpillSlot = 60 MFI.CreateStackObject(TRI.getSpillSize(RC), TRI.getSpillAlign(RC), true); 61 FPSpillSlotSet = true; 62 return FPSpillSlot; 63} 64 65const int* XCoreFunctionInfo::createEHSpillSlot(MachineFunction &MF) { 66 if (EHSpillSlotSet) { 67 return EHSpillSlot; 68 } 69 const TargetRegisterClass &RC = XCore::GRRegsRegClass; 70 const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo(); 71 MachineFrameInfo &MFI = MF.getFrameInfo(); 72 unsigned Size = TRI.getSpillSize(RC); 73 Align Alignment = TRI.getSpillAlign(RC); 74 EHSpillSlot[0] = MFI.CreateStackObject(Size, Alignment, true); 75 EHSpillSlot[1] = MFI.CreateStackObject(Size, Alignment, true); 76 EHSpillSlotSet = true; 77 return EHSpillSlot; 78} 79 80