cmd/compile/internal/ppc64, runtime internal/atomic, sync/atomic: implement faster atomics for ppc64x This change implements faster atomics for ppc64x based on the ISA 2.07B, Appendix B.2 recommendations, replacing SYNC/ISYNC by LWSYNC in some cases. Updates #21348 name old time/op new time/op delta Cond1-16 955ns 856ns -10.33% Cond2-16 2.38µs 2.03µs -14.59% Cond4-16 5.90µs 5.44µs -7.88% Cond8-16 12.1µs 11.1µs -8.42% Cond16-16 27.0µs 25.1µs -7.04% Cond32-16 59.1µs 55.5µs -6.14% LoadMostlyHits/*sync_test.DeepCopyMap-16 22.1ns 24.1ns +9.02% LoadMostlyHits/*sync_test.RWMutexMap-16 252ns 249ns -1.20% LoadMostlyHits/*sync.Map-16 16.2ns 16.3ns ~ LoadMostlyMisses/*sync_test.DeepCopyMap-16 22.3ns 22.6ns ~ LoadMostlyMisses/*sync_test.RWMutexMap-16 249ns 247ns -0.51% LoadMostlyMisses/*sync.Map-16 12.7ns 12.7ns ~ LoadOrStoreBalanced/*sync_test.RWMutexMap-16 1.27µs 1.17µs -7.54% LoadOrStoreBalanced/*sync.Map-16 1.12µs 1.10µs -2.35% LoadOrStoreUnique/*sync_test.RWMutexMap-16 1.75µs 1.68µs -3.84% LoadOrStoreUnique/*sync.Map-16 2.07µs 1.97µs -5.13% LoadOrStoreCollision/*sync_test.DeepCopyMap-16 15.8ns 15.9ns ~ LoadOrStoreCollision/*sync_test.RWMutexMap-16 496ns 424ns -14.48% LoadOrStoreCollision/*sync.Map-16 6.07ns 6.07ns ~ Range/*sync_test.DeepCopyMap-16 1.65µs 1.64µs ~ Range/*sync_test.RWMutexMap-16 278µs 288µs +3.75% Range/*sync.Map-16 2.00µs 2.01µs ~ AdversarialAlloc/*sync_test.DeepCopyMap-16 3.45µs 3.44µs ~ AdversarialAlloc/*sync_test.RWMutexMap-16 226ns 227ns ~ AdversarialAlloc/*sync.Map-16 1.09µs 1.07µs -2.36% AdversarialDelete/*sync_test.DeepCopyMap-16 553ns 550ns -0.57% AdversarialDelete/*sync_test.RWMutexMap-16 273ns 274ns ~ AdversarialDelete/*sync.Map-16 247ns 249ns ~ UncontendedSemaphore-16 79.0ns 65.5ns -17.11% ContendedSemaphore-16 112ns 97ns -13.77% MutexUncontended-16 3.34ns 2.51ns -24.69% Mutex-16 266ns 191ns -28.26% MutexSlack-16 226ns 159ns -29.55% MutexWork-16 377ns 338ns -10.14% MutexWorkSlack-16 335ns 308ns -8.20% MutexNoSpin-16 196ns 184ns -5.91% MutexSpin-16 710ns 666ns -6.21% Once-16 1.29ns 1.29ns ~ Pool-16 8.64ns 8.71ns ~ PoolOverflow-16 1.60µs 1.44µs -10.25% SemaUncontended-16 5.39ns 4.42ns -17.96% SemaSyntNonblock-16 539ns 483ns -10.42% SemaSyntBlock-16 413ns 354ns -14.20% SemaWorkNonblock-16 305ns 258ns -15.36% SemaWorkBlock-16 266ns 229ns -14.06% RWMutexUncontended-16 12.9ns 9.7ns -24.80% RWMutexWrite100-16 203ns 147ns -27.47% RWMutexWrite10-16 177ns 119ns -32.74% RWMutexWorkWrite100-16 435ns 403ns -7.39% RWMutexWorkWrite10-16 642ns 611ns -4.79% WaitGroupUncontended-16 4.67ns 3.70ns -20.92% WaitGroupAddDone-16 402ns 355ns -11.54% WaitGroupAddDoneWork-16 208ns 250ns +20.09% WaitGroupWait-16 1.21ns 1.21ns ~ WaitGroupWaitWork-16 5.91ns 5.87ns -0.81% WaitGroupActuallyWait-16 92.2ns 85.8ns -6.91% Updates #21348 Change-Id: Ibb9b271d11b308264103829e176c6d9fe8f867d3 Reviewed-on: https://go-review.googlesource.com/95175 Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
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