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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
80 lines
3.0 KiB
C++
80 lines
3.0 KiB
C++
//===-- XCoreMachineFunctionInfo.cpp - XCore machine function info --------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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