拓展：什么是accumulator Instruction Set Architecture : Design Models
- Stack Architecture
- Accumulator Architecture
- General Purpose Register Architecture
In accumulator architecture, one operand is implicitly in the accumulator. The other operand is explicitly given as memory location. For this reason, these CPUs are said to be "1-Address Machines" and the instruction set is said to be 1_address Instruction i.e. along with instruction only one operand can be passed on. This architecture strictly follows Von Neumann architecture’s Stored Program Concept.
The same example C=A+B is executed as
LOAD A ADD B STORE C
1. Introduction
2022.12.15: 什么是strand
ILDP (instruction level distributed processing)
- 竞争对手是out-of-order superscalar processor
- 目标：避免指令集历史包袱(encumbrances of instruction sets)
- strand: dependent instructions, the dependences are passed through the accumulator.
- 内涵：the multiple sequential processing elements implement multi-issue out-of-order execution
二进制翻译很简单
so translation will involve a straightforward mapping of instructions.
2. Instruction Set and Microarchitecture
仅GPR没有同为源和目的的，潜台词Accumulator可以。
a GPR is either the source or destination, but not both; this is intended to simplify the renaming process
Ai <- mem(Ai) Ai <- mem(Rj) mem(Ai) <- Rj mem(Rj) <- Ai
不全面啊，没有Ai, Rj应该有4种组合，除掉Ri-Rj应该还有3种啊，这就两种。