昇腾CANN PTO内存排序一致性

10. Memory Ordering and Consistency【免费下载链接】pto-isaParallel Tile Operation (PTO) is a virtual instruction set architecture designed by Ascend CANN, focusing on tile-level operations. This repository offers high-performance, cross-platform tile operations across Ascend platforms.项目地址: https://gitcode.com/cann/pto-isa10.1 ScopeThis chapter defines architecture-visible memory ordering and visibility guarantees for PTO Virtual ISA operations.10.2 Memory objects and domainsArchitecture-visible memory domains include:tile-local valuesglobal memory views accessed by memory operationssynchronization state affecting visibility boundariesBackend-private caches/buffers are implementation-defined, but MUST respect architecture-visible ordering outcomes.10.3 Consistency baselineThe baseline model is dependency-ordered consistency:data dependencies and explicit synchronization define required visibility orderindependent operations MAY be reordered internallyrequired synchronization points MUST establish visibility as specified10.4 Ordering guaranteesA conforming implementation MUST ensure:producer writes become visible to dependent consumers after required synchronization/ordering pointsmemory operations participating in explicit dependency chains preserve those chainssemantics defined byTSYNCand event dependencies are reflected in memory visibility10.5 Unspecified and implementation-defined behaviorThe following are architecture-restricted:accesses or interpretations outside defined domains may be unspecifiedtiming and cache policy details are implementation-definedbackend-specific memory optimizations are allowed only when they preserve required visible behavior10.6 Programming requirementsPrograms SHOULD:use explicit synchronization at producer/consumer boundariesavoid assuming implicit global ordering without a defined dependencyavoid relying on unspecified out-of-domain valuesManual mode programmers MUST ensure required ordering when tool-managed synchronization is not used.10.7 Diagnostics and conformance testsBackends SHOULD provide diagnostics for:missing ordering assumptions in illegal contextsunsupported memory-ordering formsprofile-specific restrictionsConformance tests SHOULD include ordered visibility scenarios across representative dependency patterns.【免费下载链接】pto-isaParallel Tile Operation (PTO) is a virtual instruction set architecture designed by Ascend CANN, focusing on tile-level operations. This repository offers high-performance, cross-platform tile operations across Ascend platforms.项目地址: https://gitcode.com/cann/pto-isa创作声明：本文部分内容由AI辅助生成（AIGC），仅供参考