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//===-- XCoreMachineFuctionInfo.cpp - XCore machine function info ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "XCoreMachineFunctionInfo.h"
using namespace llvm;
void XCoreFunctionInfo::anchor() { }
bool XCoreFunctionInfo::isLargeFrame(const MachineFunction &MF) const {
if (CachedEStackSize == -1) {
CachedEStackSize = MF.getFrameInfo()->estimateStackSize(MF);
}
// isLargeFrame() is used when deciding if spill slots should be added to
// allow eliminateFrameIndex() to scavenge registers.
// This is only required when there is no FP and offsets are greater than
// ~256KB (~64Kwords). Thus only for code run on the emulator!
//
// The arbitrary value of 0xf000 allows frames of up to ~240KB before spill
// slots are added for the use of eliminateFrameIndex() register scavenging.
// For frames less than 240KB, it is assumed that there will be less than
// 16KB of function arguments.
return CachedEStackSize > 0xf000;
}
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