1 //===-- XCoreMachineFunctionInfo.cpp - XCore machine function info --------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "XCoreMachineFunctionInfo.h" 11 #include "XCoreInstrInfo.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 MachineFrameInfo *MFI = MF.getFrameInfo(); 40 if (! MF.getFunction()->isVarArg()) { 41 // A fixed offset of 0 allows us to save / restore LR using entsp / retsp. 42 LRSpillSlot = MFI->CreateFixedObject(RC->getSize(), 0, true); 43 } else { 44 LRSpillSlot = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true); 45 } 46 LRSpillSlotSet = true; 47 return LRSpillSlot; 48 } 49 50 int XCoreFunctionInfo::createFPSpillSlot(MachineFunction &MF) { 51 if (FPSpillSlotSet) { 52 return FPSpillSlot; 53 } 54 const TargetRegisterClass *RC = &XCore::GRRegsRegClass; 55 MachineFrameInfo *MFI = MF.getFrameInfo(); 56 FPSpillSlot = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true); 57 FPSpillSlotSet = true; 58 return FPSpillSlot; 59 } 60 61 const int* XCoreFunctionInfo::createEHSpillSlot(MachineFunction &MF) { 62 if (EHSpillSlotSet) { 63 return EHSpillSlot; 64 } 65 const TargetRegisterClass *RC = &XCore::GRRegsRegClass; 66 MachineFrameInfo *MFI = MF.getFrameInfo(); 67 EHSpillSlot[0] = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true); 68 EHSpillSlot[1] = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true); 69 EHSpillSlotSet = true; 70 return EHSpillSlot; 71 } 72 73
