RFR: 8185723: Zero: segfaults on Power PC 32-bit

[John Paul Adrian Glaubitz]

On 08/03/2017 11:25 AM, Severin Gehwolf wrote:
> FWIW, with this patch OpenJDK 9 Zero bootcyle-images builds for me on
> PPC32 in the release variant.

Awesome :).

> That used to segv prior this patch. Slowdebug builds were OK pre-patch. 
> Issue was only observable with fastdebug/release builds.

Yep, that was my initial observation as well.

> If it matters, we also know that passing -fno-tree-dce to the hotspot
> build "fixed" the issue pre-patch.

Interesting.

> +1 from me.

Thanks.

Btw, I'm currently trying to wrap my head around how to implement atomic_copy64()
on m68k with inline assembly using cas2 which allows compare-and-swap with two
32-bit values and hence the implementation of an atomic_copy64().

I think either __arch_compare_and_exchange_val_64_acq() or atomic_exchange_acq()
from [1] should help.

Adrian

> [1] https://github.com/kaffe/kaffe/blob/master/config/m68k/atomic.h#L69

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 .''`.  John Paul Adrian Glaubitz
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