Fei Peng fiigii

What is the Strict Aliasing Rule and Why do we care?

(OR Type Punning, Undefined Behavior and Alignment, Oh My!)

What is strict aliasing? First we will describe what is aliasing and then we can learn what being strict about it means.

In C and C++ aliasing has to do with what expression types we are allowed to access stored values through. In both C and C++ the standard specifies which expression types are allowed to alias which types. The compiler and optimizer are allowed to assume we follow the aliasing rules strictly, hence the term strict aliasing rule. If we attempt to access a value using a type not allowed it is classified as undefined behavior(UB). Once we have undefined behavior all bets are off, the results of our program are no longer reliable.

Unfortunately with strict aliasing violations, we will often obtain the results we expect, leaving the possibility the a future version of a compiler with a new optimization will break code we th

Installing V8 on a Mac

Prerequisites

Install Xcode (Avaliable on the Mac App Store)
Install Xcode Command Line Tools (Preferences > Downloads)
Install depot_tools
- git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
- sudo nano ~/.bash_profile
Add export PATH=/path/to/depot_tools:"$PATH" (it's important that depot_tools comes first here)

##分布式系统(Distributed System)资料

#####希望转载的朋友，你可以不用联系我．但是一定要保留原文链接，因为这个项目还在继续也在不定期更新．希望看到文章的朋友能够学到更多．

《Reconfigurable Distributed Storage for Dynamic Networks》

介绍:这是一篇介绍在动态网络里面实现分布式系统重构的paper.论文的作者(导师)是MIT读博的时候是做分布式系统的研究的,现在在NUS带学生,不仅仅是分布式系统,还有无线网络.如果感兴趣可以去他的主页了解.

All github Emoji (Smiles)

ali.md/emoji

| 😄 | 😆 | 😊 | 😃 | ☺️ | 😏 | 😍 | 😘 | :kissing_face: | 😳 | 😌 | 😆 | 😁 | 😉 | :wink2: | 👅 | 😒 | 😅 | 😓

😩 | 😔 | 😞 | 😖 | 😨 | 😰 | 😣 | 😢 | 😭 | 😂 | 😲 | 😱 | | 😫 | 😠 | 😡 | 😤 | 😪 | 😋 | 😷

😎 | 😵 | 👿 | 😈 | 😐 | 😶 | 😇 | 👽 | 💛 | 💙 | 💜 | ❤️ | 💚 | 💔 | 💓 | 💗 | 💕 | 💞 | 💘 | ✨

optimized	baseline
push rbp	push rbp
push r15	push r15
push r14	push r14
pu

	****** START compiling System.ParseNumbers:LongToString(long,int,int,char,int):ref (MethodHash=11d4d71b)
	Generating code for Windows x64
	OPTIONS: compCodeOpt = BLENDED_CODE
	OPTIONS: compDbgCode = true
	OPTIONS: compDbgInfo = true
	OPTIONS: compDbgEnC = false
	OPTIONS: compProcedureSplitting = false
	OPTIONS: compProcedureSplittingEH = true
	OPTIONS: Jit invoked for ngen
	OPTIONS: Stack probing is DISABLED

	G_M25687_IG01:
	push rbp
	push rdi
	push rsi
	sub rsp, 544
	lea rbp, [rsp+230H]
	mov rsi, rcx
	lea rdi, [rbp-200H]
	mov ecx, 114
	xor rax, rax

	G_M10468_IG01:
	push rbp
	push rdi
	push rsi
	sub rsp, 688
	lea rbp, [rsp+20H]
	mov rsi, rcx
	lea rdi, [rbp+18H]
	mov ecx, 156
	xor rax, rax

	using System;
	using System.Runtime.Intrinsics.X86;
	using System.Linq;
	using System.Diagnostics;

	namespace testcrc
	{
	class Program
	{
	private static long iteration = 100000000;