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81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
//===-- XCoreMachineFunctionInfo.cpp - XCore machine function info --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "XCoreMachineFunctionInfo.h"
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#include "XCoreInstrInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/Function.h"
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using namespace llvm;
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void XCoreFunctionInfo::anchor() { }
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bool XCoreFunctionInfo::isLargeFrame(const MachineFunction &MF) const {
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if (CachedEStackSize == -1) {
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CachedEStackSize = MF.getFrameInfo().estimateStackSize(MF);
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}
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// isLargeFrame() is used when deciding if spill slots should be added to
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// allow eliminateFrameIndex() to scavenge registers.
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// This is only required when there is no FP and offsets are greater than
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// ~256KB (~64Kwords). Thus only for code run on the emulator!
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//
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// The arbitrary value of 0xf000 allows frames of up to ~240KB before spill
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// slots are added for the use of eliminateFrameIndex() register scavenging.
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// For frames less than 240KB, it is assumed that there will be less than
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// 16KB of function arguments.
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return CachedEStackSize > 0xf000;
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}
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int XCoreFunctionInfo::createLRSpillSlot(MachineFunction &MF) {
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if (LRSpillSlotSet) {
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return LRSpillSlot;
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}
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const TargetRegisterClass &RC = XCore::GRRegsRegClass;
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const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
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MachineFrameInfo &MFI = MF.getFrameInfo();
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if (! MF.getFunction().isVarArg()) {
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// A fixed offset of 0 allows us to save / restore LR using entsp / retsp.
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LRSpillSlot = MFI.CreateFixedObject(TRI.getSpillSize(RC), 0, true);
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} else {
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LRSpillSlot = MFI.CreateStackObject(TRI.getSpillSize(RC),
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TRI.getSpillAlignment(RC), true);
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}
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LRSpillSlotSet = true;
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return LRSpillSlot;
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}
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int XCoreFunctionInfo::createFPSpillSlot(MachineFunction &MF) {
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if (FPSpillSlotSet) {
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return FPSpillSlot;
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}
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const TargetRegisterClass &RC = XCore::GRRegsRegClass;
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const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
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MachineFrameInfo &MFI = MF.getFrameInfo();
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FPSpillSlot = MFI.CreateStackObject(TRI.getSpillSize(RC),
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TRI.getSpillAlignment(RC), true);
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FPSpillSlotSet = true;
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return FPSpillSlot;
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}
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const int* XCoreFunctionInfo::createEHSpillSlot(MachineFunction &MF) {
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if (EHSpillSlotSet) {
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return EHSpillSlot;
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}
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const TargetRegisterClass &RC = XCore::GRRegsRegClass;
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const TargetRegisterInfo &TRI = *MF.getSubtarget().getRegisterInfo();
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MachineFrameInfo &MFI = MF.getFrameInfo();
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unsigned Size = TRI.getSpillSize(RC);
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unsigned Align = TRI.getSpillAlignment(RC);
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EHSpillSlot[0] = MFI.CreateStackObject(Size, Align, true);
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EHSpillSlot[1] = MFI.CreateStackObject(Size, Align, true);
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EHSpillSlotSet = true;
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return EHSpillSlot;
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}
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