RFR: 8196136: AArch64: Correct register use in patch for JDK-8195685

[Andrew Dinn]

On 25/01/18 11:48, Andrew Haley wrote:
> On 25/01/18 11:24, Andrew Dinn wrote:
>> The following webrev against jdk10 corrects the patch to use a safe
>> register (r19)
> 
> OK, but please use r16 instead.  It's not used for anything else
> and callee-saved register are precious.  At some point we should
> move from using r13 to pass the save SP to r19, so we shouldn't
> use r19 in call stubs becuse it'll be live.
Revised webrev using r16

jira:   https://bugs.openjdk.java.net/browse/JDK-8196136
webrev: http://cr.openjdk.java.net/~adinn/8196136/webrev.02/

I modified itable (and vtable) stubs to use r16 instead of r19. Same
testing was successful.

regards,


Andrew Dinn
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Senior Principal Software Engineer
Red Hat UK Ltd
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