[9] RFR(S): 8161085: PreserveFPRegistersTest fails with 'AssertionError: Final value has changed'

[Tobias Hartmann]

Hi,

please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8161085
http://cr.openjdk.java.net/~thartmann/8161085/webrev.00/

This problem is very similar to JDK-8148175, the test fails because G1 barriers emitted by C1 do not preserve floating point registers on SPARC. The problem is that the barrier code calls into the runtime without saving/restoring the FP registers. I fixed this by using save_live_registers() instead of manually saving individual registers.

Tested with failing regression test on SPARC and RBT (running).

Thanks,
Tobias