[llvm-commits] [llvm] r76057 - in /llvm/trunk/lib/Target/SystemZ: SystemZInstrInfo.cpp SystemZInstrInfo.h

[Anton Korobeynikov]

Author: asl
Date: Thu Jul 16 09:33:01 2009
New Revision: 76057

URL: http://llvm.org/viewvc/llvm-project?rev=76057&view=rev
Log:
Another predicate routine

Modified:
    llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.cpp
    llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.h

Modified: llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.cpp?rev=76057&r1=76056&r2=76057&view=diff

==============================================================================
--- llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.cpp Thu Jul 16 09:33:01 2009
@@ -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,

Modified: llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.h?rev=76057&r1=76056&r2=76057&view=diff

==============================================================================
--- llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.h (original)
+++ llvm/trunk/lib/Target/SystemZ/SystemZInstrInfo.h Thu Jul 16 09:33:01 2009
@@ -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,