src/jdk.incubator.vector/share/classes/jdk/incubator/vector/Int256Vector.java

*** 1105,1156 ****
          }
          return new Float256Vector(res);
      }
  
      @Override
      public Int256Vector rotateLanesLeft(int j) {
!         int[] vec = getElements();
!         int[] res = new int[length()];
!         for (int i = 0; i < length(); i++){
!             res[(j + i) % length()] = vec[i];
          }
-         return new Int256Vector(res);
      }
  
      @Override
      public Int256Vector rotateLanesRight(int j) {
!         int[] vec = getElements();
!         int[] res = new int[length()];
!         for (int i = 0; i < length(); i++){
!             int z = i - j;
!             if(j < 0) {
!                 res[length() + z] = vec[i];
              } else {
!                 res[z] = vec[i];
!             }
          }
-         return new Int256Vector(res);
      }
  
      @Override
      public Int256Vector shiftLanesLeft(int j) {
!         int[] vec = getElements();
!         int[] res = new int[length()];
!         for (int i = 0; i < length() - j; i++) {
!             res[i] = vec[i + j];
          }
-         return new Int256Vector(res);
      }
  
      @Override
      public Int256Vector shiftLanesRight(int j) {
!         int[] vec = getElements();
!         int[] res = new int[length()];
!         for (int i = 0; i < length() - j; i++){
!             res[i + j] = vec[i];
          }
-         return new Int256Vector(res);
      }
  
      @Override
      @ForceInline
      public Int256Vector rearrange(Vector<Integer> v,
--- 1105,1171 ----
          }
          return new Float256Vector(res);
      }
  
      @Override
+     @ForceInline
      public Int256Vector rotateLanesLeft(int j) {
!       int L = length();
!       if (j < 0) {
!          throw new IllegalArgumentException("Index " + j + " must be zero or positive");
!       } else {
!         j = j & (L-1);
!         VectorShuffle<Integer> PermMask  = VectorShuffle.shuffleIota(SPECIES, L - j);
!         return this.rearrange(PermMask);
        }
      }
  
      @Override
+     @ForceInline
      public Int256Vector rotateLanesRight(int j) {
!       int L = length();
!       if (j < 0) {
!          throw new IllegalArgumentException("Index " + j + " must be zero or positive");
        } else {
!         j = j & (L-1);
!         VectorShuffle<Integer> PermMask = VectorShuffle.shuffleIota(SPECIES, j);
!         return this.rearrange(PermMask);
        }
      }
  
      @Override
+     @ForceInline
+     @SuppressWarnings("unchecked")
      public Int256Vector shiftLanesLeft(int j) {
!        int L = length();
!        if (j < 0) {
!          throw new IllegalArgumentException("Index " + j + " must be zero or positive");
!        } else if ( j >= L ) {
!          return ZERO;
!        } else {
!          Int256Shuffle     Iota    = (Int256Shuffle)(VectorShuffle.shuffleIota(SPECIES, L-j));
!          VectorMask<Integer> BlendMask = Iota.toVector().lessThan(Int256Vector.broadcast(SPECIES, (int)(L-j)));
!          Iota    = (Int256Shuffle)(VectorShuffle.shuffleIota(SPECIES, L -j));
!          return ZERO.blend(this.rearrange(Iota),BlendMask);
         }
      }
  
      @Override
+     @ForceInline
+     @SuppressWarnings("unchecked")
      public Int256Vector shiftLanesRight(int j) {
!        int L = length();
!        if (j < 0) {
!          throw new IllegalArgumentException("Index " + j + " must be zero or positive");
!        } else if ( j >= L ) {
!          return ZERO;
!        } else {
!          Int256Shuffle     Iota    = (Int256Shuffle)(VectorShuffle.shuffleIota(SPECIES, j));
!          VectorMask<Integer> BlendMask = Iota.toVector().greaterThanEq(Int256Vector.broadcast(SPECIES, (int)(j)));
!          Iota    = (Int256Shuffle)(VectorShuffle.shuffleIota(SPECIES, j));
!          return ZERO.blend(this.rearrange(Iota),BlendMask);
         }
      }
  
      @Override
      @ForceInline
      public Int256Vector rearrange(Vector<Integer> v,
*** 1385,1405 ****
          @Override
          public VectorSpecies<Integer> species() {
              return SPECIES;
          }
  
!         @Override
!         public IntVector toVector() {
              int[] va = new int[SPECIES.length()];
              for (int i = 0; i < va.length; i++) {
                va[i] = (int) lane(i);
              }
              return IntVector.fromArray(SPECIES, va, 0);
          }
  
          @Override
          @ForceInline
          @SuppressWarnings("unchecked")
          public <F> VectorShuffle<F> cast(VectorSpecies<F> species) {
              if (length() != species.length())
                  throw new IllegalArgumentException("Shuffle length and species length differ");
              Class<?> stype = species.elementType();
--- 1400,1427 ----
          @Override
          public VectorSpecies<Integer> species() {
              return SPECIES;
          }
  
!         private IntVector toVector_helper() {
              int[] va = new int[SPECIES.length()];
              for (int i = 0; i < va.length; i++) {
                va[i] = (int) lane(i);
              }
              return IntVector.fromArray(SPECIES, va, 0);
          }
  
          @Override
          @ForceInline
+         public IntVector toVector() {
+             return VectorIntrinsics.shuffleToVector(Int256Vector.class, int.class, Int256Shuffle.class, this,
+                                                     SPECIES.length(), 
+                                                     (s) -> (((Int256Shuffle)(s)).toVector_helper()));
+         }
+ 
+         @Override
+         @ForceInline
          @SuppressWarnings("unchecked")
          public <F> VectorShuffle<F> cast(VectorSpecies<F> species) {
              if (length() != species.length())
                  throw new IllegalArgumentException("Shuffle length and species length differ");
              Class<?> stype = species.elementType();
*** 1419,1428 ****
--- 1441,1451 ----
              } else {
                  throw new UnsupportedOperationException("Bad lane type for casting.");
              }
          }
  
+ 
          @Override
          public Int256Shuffle rearrange(VectorShuffle<Integer> o) {
              Int256Shuffle s = (Int256Shuffle) o;
              byte[] r = new byte[reorder.length];
              for (int i = 0; i < reorder.length; i++) {