RFR: AARCH64: 8138575: Improve generated code for profile counters

[Vladimir Kozlov]

Good.

Thanks,
Vladimir

On 9/30/15 1:17 AM, Andrew Haley wrote:
> AArch64 generates suboptimal code for profile counters.
>
> This
>
>      add xscratch2, x0, #0x218
>      ldr xscratch1, [xscratch2]
>      add xscratch1, xscratch1, #0x1
>      str xscratch1, [xscratch2]
>
> can be this:
>
>      ldr xscratch1, [x0, #0x218]
>      add xscratch1, xscratch1, #0x1
>      str xscratch1, [x0, #0x218]
>
> Although this looks like a very minor improvement, the same pattern
> is repeated many times in C1-generated code.
>
> http://cr.openjdk.java.net/~aph/8138575/
>
> Thanks,
> Andrew.
>