--- old/src/jdk.incubator.vector/share/classes/jdk/incubator/vector/Double128Vector.java	2018-04-04 14:45:55.731203766 -0700
+++ new/src/jdk.incubator.vector/share/classes/jdk/incubator/vector/Double128Vector.java	2018-04-04 14:45:55.475203861 -0700
@@ -719,9 +719,9 @@
         // TODO: check proper element type
         // TODO: update to pass the two species as an arguments and ideally
         // push down intrinsic call into species implementation
-        return VectorIntrinsics.rebracket(
+        return VectorIntrinsics.reinterpret(
             Double128Vector.class, double.class, LENGTH,
-            species.elementType(), this,
+            species.elementType(), species.length(), this,
             (v, t) -> species.reshape(v)
         );
     }
@@ -810,9 +810,9 @@
         public <Z> Mask<Z, Shapes.S128Bit> rebracket(Species<Z, Shapes.S128Bit> species) {
             Objects.requireNonNull(species);
             // TODO: check proper element type
-            return VectorIntrinsics.rebracket(
+            return VectorIntrinsics.reinterpret(
                 Double128Mask.class, double.class, LENGTH,
-                species.elementType(), this,
+                species.elementType(), species.length(), this,
                 (m, t) -> m.reshape(species)
             );
         }
@@ -909,26 +909,31 @@
         }
 
         @Override
+        @ForceInline
         public int bitSize() {
             return BIT_SIZE;
         }
 
         @Override
+        @ForceInline
         public int length() {
             return LENGTH;
         }
 
         @Override
+        @ForceInline
         public Class<Double> elementType() {
             return Double.class;
         }
 
         @Override
+        @ForceInline
         public int elementSize() {
             return Double.SIZE;
         }
 
         @Override
+        @ForceInline
         public Shapes.S128Bit shape() {
             return Shapes.S_128_BIT;
         }
@@ -1024,5 +1029,43 @@
         public Double128Vector fromArray(double[] a, int ax, Mask<Double, Shapes.S128Bit> m) {
             return zero().blend(fromArray(a, ax), m); // TODO: use better default impl: op(m, i -> a[ax + i]);
         }
+
+        @Override
+        @ForceInline
+        @SuppressWarnings("unchecked")
+        public <T extends Shape> Double128Vector resize(Vector<Double, T> o) {
+            Objects.requireNonNull(o);
+            if (o.bitSize() == 64) {
+                Double64Vector so = (Double64Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Double64Vector.class, double.class, so.length(),
+                    Double.class, LENGTH, so,
+                    (v, t) -> (Double128Vector)reshape(v)
+                );
+            } else if (o.bitSize() == 128) {
+                Double128Vector so = (Double128Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Double128Vector.class, double.class, so.length(),
+                    Double.class, LENGTH, so,
+                    (v, t) -> (Double128Vector)reshape(v)
+                );
+            } else if (o.bitSize() == 256) {
+                Double256Vector so = (Double256Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Double256Vector.class, double.class, so.length(),
+                    Double.class, LENGTH, so,
+                    (v, t) -> (Double128Vector)reshape(v)
+                );
+            } else if (o.bitSize() == 512) {
+                Double512Vector so = (Double512Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Double512Vector.class, double.class, so.length(),
+                    Double.class, LENGTH, so,
+                    (v, t) -> (Double128Vector)reshape(v)
+                );
+            } else {
+                throw new InternalError("Unimplemented size");
+            }
+        }
     }
 }