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Peter Cordes's user avatar
Peter Cordes's user avatar
Peter Cordes's user avatar
Peter Cordes
  • Member for 16 years, 3 months
  • Last seen this week
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About

GNU/Linux programmer/performance engineer and command line junkie. He/him.

Primary maintainer of the Stack Overflow tag wiki.

I like efficient code, and knowing how things really work.

I mostly use C/C++ (and perl/bash) on Linux, but I mostly look at assembly-language stuff on SO because it's more interesting to me, and there are fewer people posting good asm answers.

(profile pic is from https://xkcd.com/386/, and describes me perfectly. Incomplete answers/explanations make me crazy.)

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Top posts

View all questions, answers, and articles
answer
2156
Why does C++ code for testing the Collatz conjecture run faster than hand-written assembly?
Nov 1, 2016
answer
434
Deoptimizing a program for the pipeline in Intel Sandybridge-family CPUs
May 21, 2016
answer
404
How much of ‘What Every Programmer Should Know About Memory’ is still valid?
Dec 8, 2017
answer
338
What is the best way to set a register to zero in x86 assembly: xor, mov or and?
Nov 12, 2015
answer
329
Does the C++ standard allow for an uninitialized bool to crash a program?
Jan 10, 2019
answer
277
Is incrementing an int effectively atomic in specific cases?
Sep 8, 2016
answer
185
Why does glibc's strlen need to be so complicated to run quickly?
Aug 27, 2019
answer
176
Bubble sort slower with -O3 than -O2 with GCC
Oct 9, 2021
answer
164
Fastest way to do horizontal SSE vector sum (or other reduction)
Feb 8, 2016
answer
159
How to remove "noise" from GCC/clang assembly output?
Jul 24, 2016

Top Meta posts

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How are we supposed to post godbolt links now that URL shortening is blocked?
65
The dawn of Documentation: a solstice update
63
Discussion: New AI-generated content policy
62
Are questions that boil down to errors in off-site resources on-topic?
59
Git question with very nonlinear history: Answers cannibalizing each other into redundancy

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134
Why does preset "veryfast" in FFmpeg generate the most compressed file compared to all other presets?
100
Why does my browser think that https://1.1.1.1 is secure?
69
Did any compiler fully use Intel x87 80-bit floating point?
64
Why are leap seconds needed so often?
58
The start of x86: Intel 8080 vs Intel 8086?