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XCore target: Refactor LR handling

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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
This commit is contained in:
Robert Lytton
2014-01-06 14:20:41 +00:00
parent e2d3dc8b81
commit 7d2dd96694
3 changed files with 72 additions and 48 deletions
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30
lib/Target/XCore/XCoreMachineFunctionInfo.cpp
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@ -8,6 +8,8 @@
//===----------------------------------------------------------------------===//
#include "XCoreMachineFunctionInfo.h"
#include "XCoreInstrInfo.h"
#include "llvm/IR/Function.h"
using namespace llvm;
@ -28,3 +30,31 @@ bool XCoreFunctionInfo::isLargeFrame(const MachineFunction &MF) const {
// 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;
}