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Author: Riven (posted 2014-06-04 15:10:10, viewed 54 times)

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private static void testPerfReal(int[] data) {
         for(int k = 0; k < 256 * 1024; k++) {
            for(int m = 1; m < 16; m++) {
               data[m] = data[(m * 13) & 0xf];
            }
         }
      }

      private static void testPerfFake(ArrayEmbed ae) {
         int[] data = ae.iarr;

         for(int k = 0; k < 256 * 1024; k++) {
            for(int m = 1; m < 16; m++) {
               data[m] = data[(m * 13) & 0xf];
            }
         }
      }

      private static void testPerfUnsf32(int data) {
         for(int k = 0; k < 256 * 1024; k++) {
            for(int m = 1; m < 16; m++) {
               long src = c(data) + (((m * 13) & 0xf) << 2);
               long dst = c(data) + (m << 2);
               StructUnsafe.UNSAFE.putInt(dst, StructUnsafe.UNSAFE.getInt(src));
            }
         }
      }

      private static void testPerfUnsf64(long data) {
         for(int k = 0; k < 256 * 1024; k++) {
            for(int m = 1; m < 16; m++) {
               long src = data + (((m * 13) & 0xf) << 2);
               long dst = data + (m << 2);
               StructUnsafe.UNSAFE.putInt(dst, StructUnsafe.UNSAFE.getInt(src));
            }
         }
      }

      private static long c(int handle) {
         return (handle & 0xFFFF_FFFFL) << 2;
      }


real: 4125us
fake: 5973us
unsf32: 711us
unsf64: 837us

real: 4147us
fake: 5967us
unsf32: 711us
unsf64: 848us

real: 4125us
fake: 5968us
unsf32: 705us
unsf64: 838us

real: 4153us
fake: 5961us
unsf32: 705us
unsf64: 832us





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