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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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34
lib/Target/XCore/XCoreMachineFunctionInfo.h
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@@ -27,8 +27,9 @@ class Function;
/// XCore target-specific information for each MachineFunction.
class XCoreFunctionInfo : public MachineFunctionInfo {
virtual void anchor();
bool UsesLR;
bool LRSpillSlotSet;
int LRSpillSlot;
bool FPSpillSlotSet;
int FPSpillSlot;
int VarArgsFrameIndex;
mutable int CachedEStackSize;
@@ -36,15 +37,17 @@ class XCoreFunctionInfo : public MachineFunctionInfo {
public:
XCoreFunctionInfo() :
UsesLR(false),
LRSpillSlotSet(false),
LRSpillSlot(0),
FPSpillSlotSet(false),
FPSpillSlot(0),
VarArgsFrameIndex(0),
CachedEStackSize(-1) {}
explicit XCoreFunctionInfo(MachineFunction &MF) :
UsesLR(false),
LRSpillSlotSet(false),
LRSpillSlot(0),
FPSpillSlotSet(false),
FPSpillSlot(0),
VarArgsFrameIndex(0),
CachedEStackSize(-1) {}
@@ -53,16 +56,21 @@ public:
void setVarArgsFrameIndex(int off) { VarArgsFrameIndex = off; }
int getVarArgsFrameIndex() const { return VarArgsFrameIndex; }
void setUsesLR(bool val) { UsesLR = val; }
bool getUsesLR() const { return UsesLR; }
void setLRSpillSlot(int off) { LRSpillSlot = off; }
int getLRSpillSlot() const { return LRSpillSlot; }
void setFPSpillSlot(int off) { FPSpillSlot = off; }
int getFPSpillSlot() const { return FPSpillSlot; }
int createLRSpillSlot(MachineFunction &MF);
bool hasLRSpillSlot() { return LRSpillSlotSet; }
int getLRSpillSlot() const {
assert(LRSpillSlotSet && "LR Spill slot no set");
return LRSpillSlot;
}
int createFPSpillSlot(MachineFunction &MF);
bool hasFPSpillSlot() { return FPSpillSlotSet; }
int getFPSpillSlot() const {
assert(FPSpillSlotSet && "FP Spill slot no set");
return FPSpillSlot;
}
bool isLargeFrame(const MachineFunction &MF) const;
std::vector<std::pair<MCSymbol*, CalleeSavedInfo> > &getSpillLabels() {