Software optimization resources. C++ and assembly. Windows, Linux, BSD, Mac OS X
See also my blog Contents Optimization manuals Vector class library Object file converter and disassembler Subroutine library ForwardCom: An open standard instruction set for high performance microprocessors Test programs for measuring clock cycles in C++ and assembly code Floating point exception tracking through NAN propagation CPUID manipulation program Links Optimization manuals This series of
Understanding Atomics and Memory Ordering
Atomics and Memory Ordering always feel like an unapproachable topic. In the sea of poor explanations, I wish to add another by describing how I reason about all of this mess. This is only my understanding so if you need a better/formal explanation, I recommend reading through the memory model for your given programming language. In this case, it would be the C11 Memory Model described at cpprefer
富士通C++コンパイラの最適化機能の改善について
watanabe-chiba-report.md 2.4 富士通C++コンパイラの最適化機能の改善について 東京大学物性研究所 物質設計評価施設 渡辺宙志 富士通株式会社 次世代テクニカルコンピューティング開発本部 千葉修一 ※ 本稿はメニーコア時代のアプリ性能検討WG 成果報告書にて公開された内容を整形したものです。 2.4.1 はじめに HPC分野においては、FortranないしC/C++言語が広く使われている。Fortran、C言語、C++言語のいずれも活発に仕様が改定され、現在も発展し続けている言語ではあるが、数値計算向けの「普段使いの言語」としては、おそらくPythonやJuliaなどの方が広く使われていると思われる。特にPythonは、昨今の機械学習ブームの牽引役として広く使われているようである。今後、PythonやJuliaといった言語によるスパコン利用も増えていくと思われる
A bug story: data alignment on x86
I once had to calculate a sum of a vector of integers. This sounds unusual. Who ever wants to do this in real life? Normally, we only see code like this as primary school assignments or compiler benchmarks. However, this time it happened in real life. Well, the actual task was to verify the IP header checksum, which is a ones’ complement sum of two-byte words. Simply speaking, it means adding toge
Deoptimizing a program for the pipeline in Intel Sandybridge-family CPUs
I've been racking my brain for a week trying to complete this assignment and I'm hoping someone here can lead me toward the right path. Let me start with the instructor's instructions: Your assignment is the opposite of our first lab assignment, which was to optimize a prime number program. Your purpose in this assignment is to pessimize the program, i.e. make it run slower. Both of these are CPU-
セキュリティ アドバイザリ 2862973 ～ ルート証明書プログラムにおける MD5ハッシュの利用制限 - 日本のセキュリティチーム - Site Home - TechNet Blogs
If you have arrived in the middle of this blog series, you might want instead to begin at the beginning. This post examines the optimization called Dead-Code-Elimination, which I’ll abbreviate to DCE. It does what it says: discards any calculations whose results are not actually used by the program. Now, you will probably assert that your code calculates only results that are used, and never any
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