More 2D bugfixes

I worked on a patch to fix a bug in the Pisces renderer:

http://hg.openjdk.java.net/jdk7/2d/jdk/rev/fb03586d68b6

http://bugs.openjdk.java.net/show_bug.cgi?id=100030

The bug was that a circle was rendered like a 'C' shape, that is, the right most edge of the circle wasn't rendered properly. It turned out that there was a off-by-one error.

And there are a few more bugfixes in progress:

https://bugs.openjdk.java.net/show_bug.cgi?id=100035

https://bugs.openjdk.java.net/show_bug.cgi?id=100031

https://bugs.openjdk.java.net/show_bug.cgi?id=100088

https://bugs.openjdk.java.net/show_bug.cgi?id=100089

Thanks to Jennifer Godinez.

[Note: at least the 100031 patch has been checked into OpenJDK.]

A server compiler crash fix

Here's my latest contribution to OpenJDK:

http://hg.openjdk.java.net/jdk7/hotspot-comp/hotspot/rev/fd50a67f97d1

The patch fixes a server compiler crash that happens in a very rare condition, described here. A key attribute of the server compiler IR is that an instruction must dominate all its inputs. However, in the function remix_address_expressions(), this property was violated and caused a crash in a later split if transformation.

Thanks to Chuck Rasbold and Tom Rodriguez.