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 14 using namespace llvm; 15 16 void XCoreFunctionInfo::anchor() { } 17 18 bool 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 34 int 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.getSpillAlignment(RC), true); 47 } 48 LRSpillSlotSet = true; 49 return LRSpillSlot; 50 } 51 52 int 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 = MFI.CreateStackObject(TRI.getSpillSize(RC), 60 TRI.getSpillAlignment(RC), true); 61 FPSpillSlotSet = true; 62 return FPSpillSlot; 63 } 64 65 const 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 unsigned Align = TRI.getSpillAlignment(RC); 74 EHSpillSlot[0] = MFI.CreateStackObject(Size, Align, true); 75 EHSpillSlot[1] = MFI.CreateStackObject(Size, Align, true); 76 EHSpillSlotSet = true; 77 return EHSpillSlot; 78 } 79 80