RISC-VVector ISA Spec，Keystone of RisC-V Based High Performance Computing - Mark zhan.pdf
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RISC-V Vector ISA Spec —
Keystone of RISC-V Based High Performance Computing
Stream Computing Inc.
Mark Zhan
OSDT2019
Stream Computing Inc.
1
Ø Parallelism Technology of Modern HPC Processor:
l Instruction Stream: Instruction Level Parallelism (ILP) —— VLIW, Superscalar
l Data Stream: Data Level Parallelism —— SIMD
Stream Computing Inc.
2
SIMD Instructions
Ø SIMD-based Data Parallelism: when you
have a large mass of data of a uniform
data-type that needs the same instruction
performed on it.
l Matrix Computing: Image Processing, Machine
Learning, scientific computation etc.
Ø SIMD Instruction Programming Model:
l Pure SIMD machine (e.g: SIMD-only CPU)? NO!
l As a part of a SISD host machine. Programs are
written for a SISD machine, and include in their
code SIMD instructions.
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