Implement null and undef values for FastISel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55500 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 9fa37b1..33da2b0 100644 (file)
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -31,6 +31,8 @@ unsigned FastISel::getRegForValue(Value *V, DenseMap<const Value*, unsigned> &Va
     if (CI->getValue().getActiveBits() > 64)
       return 0;
     Reg = FastEmit_i(VT, VT, ISD::Constant, CI->getZExtValue());
+  } else if (isa<ConstantPointerNull>(V)) {
+    Reg = FastEmit_i(VT, VT, ISD::Constant, 0);
   } else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
     Reg = FastEmit_f(VT, VT, ISD::ConstantFP, CF);
 
@@ -53,6 +55,9 @@ unsigned FastISel::getRegForValue(Value *V, DenseMap<const Value*, unsigned> &Va
       if (Reg == 0)
         return 0;
     }
+  } else if (isa<UndefValue>(V)) {
+    Reg = createResultReg(TLI.getRegClassFor(VT));
+    BuildMI(MBB, TII.get(TargetInstrInfo::IMPLICIT_DEF), Reg);
   }
 
   return Reg;