> On Jun 6, 2018, at 4:38 PM, Savolainen, Petri (Nokia - FI/Espoo) > <petri.savolai...@nokia.com> wrote: > > > >> -----Original Message----- >> From: lng-odp [mailto:lng-odp-boun...@lists.linaro.org] On Behalf Of Maxim >> Uvarov >> Sent: Wednesday, June 6, 2018 4:26 PM >> To: Maxim Kuvyrkov <maxim.kuvyr...@linaro.org> >> Cc: LNG ODP Mailman List <lng-odp@lists.linaro.org> >> Subject: [lng-odp] armv8 gcc lock free instructions >> >> Hello Maxim, >> >> we have discussion here that gcc for armv8 does not generated lock free >> instructions for 64 bit types. But all other arched do. >> >> https://github.com/Linaro/odp/pull/611 >> >> Do you know reasons for that? >> >> Thank you, >> Maxim. > > The question is: why 128 bit GCC built-in atomics are not lock-free on ARMv8 > (__atomic_is_lock_free(16) returns false)? ARMv8.0 ISA has dual 64bit atomic > instructions available.
Hi Petri, I don't know the answer off-hand. Let me check on this with my team. -- Maxim Kuvyrkov www.linaro.org
