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7d2dd96694
We also narrow the liveness of FP & LR during the prologue to reflect the actual usage of the registers. I have been unable to construct a test to prove the previous live range was too large. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198611 91177308-0d34-0410-b5e6-96231b3b80d8
61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
//===-- XCoreMachineFuctionInfo.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/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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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(RC->getSize(), 0, true);
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} else {
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LRSpillSlot = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), 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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MachineFrameInfo *MFI = MF.getFrameInfo();
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FPSpillSlot = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true);
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FPSpillSlotSet = true;
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return FPSpillSlot;
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}
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