blob: 9ef9752d0a5b0432075da3ae87f69dbb781663bf (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
//===-- 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"
#include "XCoreInstrInfo.h"
#include "llvm/IR/Function.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;
}
int XCoreFunctionInfo::createLRSpillSlot(MachineFunction &MF) {
if (LRSpillSlotSet) {
return LRSpillSlot;
}
const TargetRegisterClass *RC = &XCore::GRRegsRegClass;
MachineFrameInfo *MFI = MF.getFrameInfo();
if (! MF.getFunction()->isVarArg()) {
// A fixed offset of 0 allows us to save / restore LR using entsp / retsp.
LRSpillSlot = MFI->CreateFixedObject(RC->getSize(), 0, true);
} else {
LRSpillSlot = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true);
}
LRSpillSlotSet = true;
return LRSpillSlot;
}
int XCoreFunctionInfo::createFPSpillSlot(MachineFunction &MF) {
if (FPSpillSlotSet) {
return FPSpillSlot;
}
const TargetRegisterClass *RC = &XCore::GRRegsRegClass;
MachineFrameInfo *MFI = MF.getFrameInfo();
FPSpillSlot = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true);
FPSpillSlotSet = true;
return FPSpillSlot;
}
const int* XCoreFunctionInfo::createEHSpillSlot(MachineFunction &MF) {
if (EHSpillSlotSet) {
return EHSpillSlot;
}
const TargetRegisterClass *RC = &XCore::GRRegsRegClass;
MachineFrameInfo *MFI = MF.getFrameInfo();
EHSpillSlot[0] = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true);
EHSpillSlot[1] = MFI->CreateStackObject(RC->getSize(), RC->getAlignment(), true);
EHSpillSlotSet = true;
return EHSpillSlot;
}
|
