Index: lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -8200,11 +8200,10 @@
 
 SDValue DAGCombiner::visitFCEIL(SDNode *N) {
   SDValue N0 = N->getOperand(0);
-  ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
   EVT VT = N->getValueType(0);
 
   // fold (fceil c1) -> fceil(c1)
-  if (N0CFP)
+  if (isConstantFPBuildVectorOrConstantFP(N0))
     return DAG.getNode(ISD::FCEIL, SDLoc(N), VT, N0);
 
   return SDValue();
@@ -8212,11 +8211,10 @@
 
 SDValue DAGCombiner::visitFTRUNC(SDNode *N) {
   SDValue N0 = N->getOperand(0);
-  ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
   EVT VT = N->getValueType(0);
 
   // fold (ftrunc c1) -> ftrunc(c1)
-  if (N0CFP)
+  if (isConstantFPBuildVectorOrConstantFP(N0))
     return DAG.getNode(ISD::FTRUNC, SDLoc(N), VT, N0);
 
   return SDValue();
@@ -8224,11 +8222,10 @@
 
 SDValue DAGCombiner::visitFFLOOR(SDNode *N) {
   SDValue N0 = N->getOperand(0);
-  ConstantFPSDNode *N0CFP = dyn_cast<ConstantFPSDNode>(N0);
   EVT VT = N->getValueType(0);
 
   // fold (ffloor c1) -> ffloor(c1)
-  if (N0CFP)
+  if (isConstantFPBuildVectorOrConstantFP(N0))
     return DAG.getNode(ISD::FFLOOR, SDLoc(N), VT, N0);
 
   return SDValue();
Index: lib/CodeGen/SelectionDAG/SelectionDAG.cpp
===================================================================
--- lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -2845,12 +2845,38 @@
 
   // Constant fold unary operations with a vector integer or float operand.
   if (BuildVectorSDNode *BV = dyn_cast<BuildVectorSDNode>(Operand.getNode())) {
-    if (BV->isConstant()) {
+    if (BV->isConstant() && VT.isVector()) {
+      EVT SVT = VT.getVectorElementType();
+      SmallVector<SDValue, 8> Ops;
       switch (Opcode) {
       default:
         // FIXME: Entirely reasonable to perform folding of other unary
         // operations here as the need arises.
         break;
+      case ISD::FCEIL:
+      case ISD::FTRUNC:
+      case ISD::FFLOOR: {
+        APFloat::roundingMode mode =
+            (Opcode == ISD::FTRUNC
+                 ? APFloat::rmTowardZero
+                 : (Opcode == ISD::FCEIL ? APFloat::rmTowardPositive
+                                         : APFloat::rmTowardNegative));
+        for (int i = 0, e = VT.getVectorNumElements(); i != e; ++i) {
+          SDValue OpN = BV->getOperand(i);
+          if (OpN.getOpcode() != ISD::UNDEF &&
+              OpN.getOpcode() != ISD::ConstantFP)
+            break;
+          if (OpN.getOpcode() != ISD::UNDEF) {
+            APFloat V = cast<ConstantFPSDNode>(OpN)->getValueAPF();
+            APFloat::opStatus fs = V.roundToIntegral(mode);
+            if (fs != APFloat::opOK && fs != APFloat::opInexact)
+              break;
+            OpN = getConstantFP(V, SVT);
+          }
+          Ops.push_back(OpN);
+        }
+        break;
+      }
       case ISD::FNEG:
       case ISD::FABS:
       case ISD::FP_EXTEND:
@@ -2858,20 +2884,20 @@
       case ISD::UINT_TO_FP:
       case ISD::SINT_TO_FP: {
         // Let the above scalar folding handle the folding of each element.
-        SmallVector<SDValue, 8> Ops;
         for (int i = 0, e = VT.getVectorNumElements(); i != e; ++i) {
           SDValue OpN = BV->getOperand(i);
-          OpN = getNode(Opcode, DL, VT.getVectorElementType(), OpN);
+          OpN = getNode(Opcode, DL, SVT, OpN);
           if (OpN.getOpcode() != ISD::UNDEF &&
               OpN.getOpcode() != ISD::Constant &&
               OpN.getOpcode() != ISD::ConstantFP)
             break;
           Ops.push_back(OpN);
         }
-        if (Ops.size() == VT.getVectorNumElements())
-          return getNode(ISD::BUILD_VECTOR, DL, VT, Ops);
+        break;
       }
       }
+      if (Ops.size() == VT.getVectorNumElements())
+        return getNode(ISD::BUILD_VECTOR, DL, VT, Ops);
     }
   }
 
Index: test/CodeGen/X86/vec_floor.ll
===================================================================
--- test/CodeGen/X86/vec_floor.ll
+++ test/CodeGen/X86/vec_floor.ll
@@ -180,3 +180,49 @@
   ret <8 x float> %t
 }
 declare <8 x float> @llvm.nearbyint.v8f32(<8 x float> %p)
+
+;
+; Constant Folding
+;
+
+define <2 x double> @const_floor_v2f64() {
+  ; CHECK: const_floor_v2f64
+  ; CHECK: movaps {{.*#+}} xmm0 = [-2.000000e+00,2.000000e+00]
+  %t = call <2 x double> @llvm.floor.v2f64(<2 x double> <double -1.5, double 2.5>)
+  ret <2 x double> %t
+}
+
+define <4 x float> @const_floor_v4f32() {
+  ; CHECK: const_floor_v4f32
+  ; CHECK: movaps {{.*#+}} xmm0 = [-4.000000e+00,6.000000e+00,-9.000000e+00,2.000000e+00]
+  %t = call <4 x float> @llvm.floor.v4f32(<4 x float> <float -3.5, float 6.0, float -9.0, float 2.5>)
+  ret <4 x float> %t
+}
+
+define <2 x double> @const_ceil_v2f64() {
+  ; CHECK: const_ceil_v2f64
+  ; CHECK: movaps {{.*#+}} xmm0 = [-1.000000e+00,3.000000e+00]
+  %t = call <2 x double> @llvm.ceil.v2f64(<2 x double> <double -1.5, double 2.5>)
+  ret <2 x double> %t
+}
+
+define <4 x float> @const_ceil_v4f32() {
+  ; CHECK: const_ceil_v4f32
+  ; CHECK: movaps {{.*#+}} xmm0 = [-3.000000e+00,6.000000e+00,-9.000000e+00,3.000000e+00]
+  %t = call <4 x float> @llvm.ceil.v4f32(<4 x float> <float -3.5, float 6.0, float -9.0, float 2.5>)
+  ret <4 x float> %t
+}
+
+define <2 x double> @const_trunc_v2f64() {
+  ; CHECK: const_trunc_v2f64
+  ; CHECK: movaps {{.*#+}} xmm0 = [-1.000000e+00,2.000000e+00]
+  %t = call <2 x double> @llvm.trunc.v2f64(<2 x double> <double -1.5, double 2.5>)
+  ret <2 x double> %t
+}
+
+define <4 x float> @const_trunc_v4f32() {
+  ; CHECK: const_trunc_v4f32
+  ; CHECK: movaps {{.*#+}} xmm0 = [-3.000000e+00,6.000000e+00,-9.000000e+00,2.000000e+00]
+  %t = call <4 x float> @llvm.trunc.v4f32(<4 x float> <float -3.5, float 6.0, float -9.0, float 2.5>)
+  ret <4 x float> %t
+}