MachineRegisterInfo: Introduce isPhysRegUsed()

[oota-llvm.git] / lib / CodeGen / BranchFolding.cpp

diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp
index 608f021b0350973bb21552fe186fb36930f01935..260ab537053943759b8b17f997f82f0b68133f9d 100644 (file)
--- a/lib/CodeGen/BranchFolding.cpp
+++ b/lib/CodeGen/BranchFolding.cpp
@@ -151,9 +151,13 @@ bool BranchFolder::OptimizeImpDefsBlock(MachineBasicBlock *MBB) {
     if (!I->isImplicitDef())
       break;
     unsigned Reg = I->getOperand(0).getReg();
-    for (MCSubRegIterator SubRegs(Reg, TRI, /*IncludeSelf=*/true);
-         SubRegs.isValid(); ++SubRegs)
-      ImpDefRegs.insert(*SubRegs);
+    if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
+      for (MCSubRegIterator SubRegs(Reg, TRI, /*IncludeSelf=*/true);
+           SubRegs.isValid(); ++SubRegs)
+        ImpDefRegs.insert(*SubRegs);
+    } else {
+      ImpDefRegs.insert(Reg);
+    }
     ++I;
   }
   if (ImpDefRegs.empty())
@@ -601,8 +605,7 @@ static bool ProfitableToMerge(MachineBasicBlock *MBB1,
   // branch instruction, which is likely to be smaller than the 2
   // instructions that would be deleted in the merge.
   MachineFunction *MF = MBB1->getParent();
-  if (EffectiveTailLen >= 2 &&
-      MF->getFunction()->hasFnAttribute(Attribute::OptimizeForSize) &&
+  if (EffectiveTailLen >= 2 && MF->getFunction()->optForSize() &&
       (I1 == MBB1->begin() || I2 == MBB2->begin()))
     return true;