RFR: 8075930: AARCH64: Use FP Register in C2

[Edward Nevill]

Hi,

If everyone is happy with this patch could someone push it please,

Thanks,
Ed.

On Fri, 2015-04-10 at 07:44 -0700, Vladimir Kozlov wrote:
> Looks good.
> 
> Thanks,
> Vladimir
> 
> On 4/10/15 1:54 AM, Edward Nevill wrote:
> > Hi Vladimir,
> >
> > On Thu, 2015-04-09 at 10:32 -0700, Vladimir Kozlov wrote:
> >> Hi Edward,
> >>
> >> In frame() I think check !defined(COMPILER2) is useless because COMPILER2 is always defined in 64-bit Server Hotspot VM.
> >> Unless you have configuration without C2. I think it should be dynamic check after you find who generated this _cb.
> >> Can you explain what this code does (there is not comment):
> >
> > We do build without C2 as part of our testing. However, as Andrew Haley said, this is old debug code, so I propose simply removing it. Its usefulness is rather limited once fp can be allocated as a general purpose register.
> >
> >>
> >>     80 #ifndef PRODUCT
> >>     81   if (fp)
> >>     82     if (sp > fp || (fp - sp > 0x100000))
> >>     83       for(;;)
> >>     84         asm("nop");
> >>     85 #endif
> >
> > New webrev removing this code @
> >
> > http://cr.openjdk.java.net/~enevill/8075930/webrev.03/
> >
> > All the best,
> > Ed.
> >
> >