【arm】arm优化基本知识（寄存器、指令集、调用规则以及汇编格式）

Date: 2018.7.1

---

1、参考

https://developer.arm.com/products/architecture/a-profile/docs/den0018/a
arm neon介绍:
https://developer.arm.com/technologies/neon
https://blog.youkuaiyun.com/EmSoftEn/article/details/51834171

ARM程序调用规则(ATPCS)分析:
https://blog.youkuaiyun.com/rockrockwu/article/details/8043618

ARM（RISC）和x86（CISC）的技术差异:
https://w