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Another predicate routine

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76057 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2009-07-16 14:33:01 +00:00
parent 27bf677e59
commit f1106c4247
2 changed files with 31 additions and 0 deletions
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30
lib/Target/SystemZ/SystemZInstrInfo.cpp
View File

@ -52,6 +52,12 @@ SystemZInstrInfo::SystemZInstrInfo(SystemZTargetMachine &tm)
RegSpillOffsets[SpillOffsTab[i][0]] = SpillOffsTab[i][1];
}
/// isGVStub - Return true if the GV requires an extra load to get the
/// real address.
static inline bool isGVStub(GlobalValue *GV, SystemZTargetMachine &TM) {
return TM.getSubtarget<SystemZSubtarget>().GVRequiresExtraLoad(GV, TM, false);
}
void SystemZInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIdx,
@ -246,6 +252,30 @@ unsigned SystemZInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
return 0;
}
bool SystemZInstrInfo::isInvariantLoad(const MachineInstr *MI) const {
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineOperand &MO = MI->getOperand(i);
// Loads from constant pools are trivially invariant.
if (MO.isCPI())
return true;
if (MO.isGlobal())
return isGVStub(MO.getGlobal(), TM);
// If this is a load from an invariant stack slot, the load is a constant.
if (MO.isFI()) {
const MachineFrameInfo &MFI =
*MI->getParent()->getParent()->getFrameInfo();
int Idx = MO.getIndex();
return MFI.isFixedObjectIndex(Idx) && MFI.isImmutableObjectIndex(Idx);
}
}
// All other instances of these instructions are presumed to have other
// issues.
return false;
}
bool
SystemZInstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,

1
lib/Target/SystemZ/SystemZInstrInfo.h
View File

@ -70,6 +70,7 @@ public:
unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
unsigned isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const;
unsigned isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const;
bool isInvariantLoad(const MachineInstr *MI) const;
virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,