hg: jdk7/hotspot-comp/hotspot: 6800154: Add comments to long_by_long_mulhi() for better understandability

[Christian.Thalinger at Sun.COM]

Changeset: bbef4344adb2
Author:    twisti
Date:      2009-02-13 09:09 -0800
URL:       http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/bbef4344adb2

6800154: Add comments to long_by_long_mulhi() for better understandability
Summary: This patch adds a comment pointing to the Hacker's Delight version of the algorithm plus a verbatim copy of it.  Furthermore it adds inline comments.
Reviewed-by: kvn, jrose

! src/share/vm/opto/divnode.cpp
+ test/compiler/6603011/Test.java
+ test/compiler/6800154/Test6800154.java