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A change to the memory consistency model (AArch64 only); to support the (non-default) weaker RCpc (Release Consistent processor consistent) model of C++11/C11 (the default C++11/C11 consistency model was already supported in previous ARMv8). ID mechanism support for larger system-visible caches (AArch64 and AArch32).
Transactional memory model [7] is the combination of cache coherency and memory consistency models as a communication model for shared memory systems supported by software or hardware; a transactional memory model provides both memory consistency and cache coherency. A transaction is a sequence of operations executed by a process that ...
The alternative definition of a coherent system is via the definition of sequential consistency memory model: "the cache coherent system must appear to execute all threads’ loads and stores to a single memory location in a total order that respects the program order of each thread". [4]
ARM (stylised in lowercase as arm, formerly an acronym for Advanced RISC Machines and originally Acorn RISC Machine) is a family of RISC instruction set architectures (ISAs) for computer processors. Arm Holdings develops the ISAs and licenses them to other companies, who build the physical devices that use the instruction set.
In multiprocessor systems with separate caches that share a common memory, a same datum can be stored in more than one cache. A data consistency problem may occur when data is modified in one cache only. The protocols to maintain the coherency for multiple processors are called cache-coherency protocols.
In its second version, AMBA 2 in 1999, Arm added AMBA High-performance Bus (AHB) that is a single clock-edge protocol. In 2003, Arm introduced the third generation, AMBA 3, including Advanced eXtensible Interface (AXI) to reach even higher performance interconnect and the Advanced Trace Bus (ATB) as part of the CoreSight on-chip debug and trace ...
There are several memory-consistency models for SMP systems: Sequential consistency (all reads and all writes are in-order) Relaxed consistency (some types of reordering are allowed) Loads can be reordered after loads (for better working of cache coherency, better scaling) Loads can be reordered after stores; Stores can be reordered after stores
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