--- old/src/jdk.incubator.vector/share/classes/jdk/incubator/vector/Long512Vector.java	2018-04-04 14:46:12.211197743 -0700
+++ new/src/jdk.incubator.vector/share/classes/jdk/incubator/vector/Long512Vector.java	2018-04-04 14:46:11.955197838 -0700
@@ -707,9 +707,9 @@
         // 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(
             Long512Vector.class, long.class, LENGTH,
-            species.elementType(), this,
+            species.elementType(), species.length(), this,
             (v, t) -> species.reshape(v)
         );
     }
@@ -798,9 +798,9 @@
         public <Z> Mask<Z, Shapes.S512Bit> rebracket(Species<Z, Shapes.S512Bit> species) {
             Objects.requireNonNull(species);
             // TODO: check proper element type
-            return VectorIntrinsics.rebracket(
+            return VectorIntrinsics.reinterpret(
                 Long512Mask.class, long.class, LENGTH,
-                species.elementType(), this,
+                species.elementType(), species.length(), this,
                 (m, t) -> m.reshape(species)
             );
         }
@@ -897,26 +897,31 @@
         }
 
         @Override
+        @ForceInline
         public int bitSize() {
             return BIT_SIZE;
         }
 
         @Override
+        @ForceInline
         public int length() {
             return LENGTH;
         }
 
         @Override
+        @ForceInline
         public Class<Long> elementType() {
             return Long.class;
         }
 
         @Override
+        @ForceInline
         public int elementSize() {
             return Long.SIZE;
         }
 
         @Override
+        @ForceInline
         public Shapes.S512Bit shape() {
             return Shapes.S_512_BIT;
         }
@@ -1012,5 +1017,43 @@
         public Long512Vector fromArray(long[] a, int ax, Mask<Long, Shapes.S512Bit> 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> Long512Vector resize(Vector<Long, T> o) {
+            Objects.requireNonNull(o);
+            if (o.bitSize() == 64) {
+                Long64Vector so = (Long64Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Long64Vector.class, long.class, so.length(),
+                    Long.class, LENGTH, so,
+                    (v, t) -> (Long512Vector)reshape(v)
+                );
+            } else if (o.bitSize() == 128) {
+                Long128Vector so = (Long128Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Long128Vector.class, long.class, so.length(),
+                    Long.class, LENGTH, so,
+                    (v, t) -> (Long512Vector)reshape(v)
+                );
+            } else if (o.bitSize() == 256) {
+                Long256Vector so = (Long256Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Long256Vector.class, long.class, so.length(),
+                    Long.class, LENGTH, so,
+                    (v, t) -> (Long512Vector)reshape(v)
+                );
+            } else if (o.bitSize() == 512) {
+                Long512Vector so = (Long512Vector)o;
+                return VectorIntrinsics.reinterpret(
+                    Long512Vector.class, long.class, so.length(),
+                    Long.class, LENGTH, so,
+                    (v, t) -> (Long512Vector)reshape(v)
+                );
+            } else {
+                throw new InternalError("Unimplemented size");
+            }
+        }
     }
 }