hg: jdk8/tl/jdk: 7131192: BigInteger.doubleValue() is depressingly slow

[alan.bateman at oracle.com]

Changeset: 814759462705
Author:    bpb
Date:      2013-06-21 11:50 -0700
URL:       http://hg.openjdk.java.net/jdk8/tl/jdk/rev/814759462705

7131192: BigInteger.doubleValue() is depressingly slow
Summary: In doubleValue() and floatValue() replace converting to String and parsing to Double or Float with direct conversion into IEEE 754 bits.
Reviewed-by: bpb, drchase, martin
Contributed-by: Louis Wasserman <lowasser at google.com>

! src/share/classes/java/math/BigInteger.java
+ test/java/math/BigInteger/PrimitiveConversionTests.java