[aarch64-port-dev ] RFR: 8075930: AARCH64: Use FP Register in C2

[Edward Nevill]

On 23 April 2015 at 20:01, Dean Long <dean.long at oracle.com> wrote:

>
> What happens at a safepoint polling point in a loop?  Will C2 try to keep
> an oop value
> in R29 live across the safepoint?  If so, I assume the oopmap takes care
> of that case as
> well.


Yes. Here is an example of an OopMap at a safepoint in a loop

   0x000003ff710efa1c: adrp      x10, 0x000003ff79830000
                                                ; OopMap{r14=Oop off=160}
                                                ;*goto
                                                ; - MethodAtom::execute at 46
(line 35)
                                                ;   {poll}
  0x000003ff710efa20: ldr       wzr, [x10]      ;*goto
                                                ; - MethodAtom::execute at 46
(line 35)
                                                ;   {poll}
  0x000003ff710efa24: ldr       w10, [x14,#16]
  0x000003ff710efa28: cmp       w16, w10
  0x000003ff710efa2c: b.ge      0x000003ff710efb74  ;*aload_0
                                                ; - MethodAtom::execute at 12
(line 37)

All the best,
Ed.