atomics/powerpc: Fix WMB instruction #3669
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* `lwsync` is a write memory barrier.
- `eieio` is really not meant for this type of operation.
* `lwsync` can also be used for the read memory barrier according to
my reading of the of the Power 8 ISA docs (v2.07)
- https://www-01.ibm.com/marketing/iwm/iwm/web/reg/download.do?source=swg-opower&S_PKG=dl&lang=en_US&cp=UTF-8
* References openpmix/openpmix#391
Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>
(cherry picked from commit 4796193)
Signed-off-by: Joshua Hursey <jhursey@us.ibm.com>
hjelmn
approved these changes
Jun 7, 2017
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@jsquyres i think this is ready to go. |
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lwsyncis a write memory barrier.eieiois really not meant for this type of operation.