test/compiler/intrinsics/multiplytolen/TestMultiplyToLen.java

*** 32,41 ****
--- 32,42 ----
   *      -XX:CompileCommand=option,TestMultiplyToLen::base_multiply,ccstr,DisableIntrinsic,_multiplyToLen
   *      -XX:CompileCommand=option,java.math.BigInteger::multiply,ccstr,DisableIntrinsic,_multiplyToLen
   *      -XX:CompileCommand=inline,java.math.BigInteger::multiply TestMultiplyToLen
   */
  
+ import java.util.Arrays;
  import java.util.Random;
  import java.math.*;
  
  public class TestMultiplyToLen {
  
*** 95,110 ****
--- 96,135 ----
  
          oldsum = oldsum.add(oldres);
          newsum = newsum.add(newres);
  
          if (!bytecompare(oldres,newres)) {
+           System.out.println(b1);
+           System.out.println(b2);
+           System.out.print("mismatch for:b1:" + stringify(b1) + " :b2:" + stringify(b2) + " :oldres:" + stringify(oldres) + " :newres:" + stringify(newres));
+           throw new Exception("Failed");
+         }
+       }
+ 
+       // Test carry propagation.  Multiple carries during bignum
+       // multiplication are rare (especially when using 64-bit
+       // arithmetic) so we have to provoke them deliberately.
+       for (int j = 4; j <= 396; j += 4) {
+         byte[] bytes = new byte[j];
+         Arrays.fill(bytes, (byte)255);
+         b1 = new BigInteger(bytes);
+         b2 = new BigInteger(bytes);
+ 
+         oldres = base_multiply(b1,b2);
+         newres = new_multiply(b1,b2);
+ 
+         oldsum = oldsum.add(oldres);
+         newsum = newsum.add(newres);
+ 
+         if (!bytecompare(oldres,newres)) {
            System.out.print("mismatch for:b1:" + stringify(b1) + " :b2:" + stringify(b2) + " :oldres:" + stringify(oldres) + " :newres:" + stringify(newres));
            System.out.println(b1);
            System.out.println(b2);
            throw new Exception("Failed");
          }
        }
+ 
        if (!bytecompare(oldsum,newsum))  {
          System.out.println("Failure: oldsum:" + stringify(oldsum) + " newsum:" + stringify(newsum));
          throw new Exception("Failed");
        } else {
          System.out.println("Success");