Another predicate routine
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76057 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.cpp b/lib/Target/SystemZ/SystemZInstrInfo.cpp
index 46db94e..914d333 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.cpp
+++ b/lib/Target/SystemZ/SystemZInstrInfo.cpp
@@ -52,6 +52,12 @@
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 @@
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,
diff --git a/lib/Target/SystemZ/SystemZInstrInfo.h b/lib/Target/SystemZ/SystemZInstrInfo.h
index 2bcdb2e..0ef3ca9 100644
--- a/lib/Target/SystemZ/SystemZInstrInfo.h
+++ b/lib/Target/SystemZ/SystemZInstrInfo.h
@@ -70,6 +70,7 @@
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,