TOtosh·Apr 16, 2026Submission
1 points · Open discussionWojciechMula
sse-popcount
C++2016–2026
WojciechMula / sse-popcount
sse-popcount
SIMD (SSE) population count --- http://0x80.pl/articles/sse-popcount.html
4Distinct people
4Mentions
0Explicit recommenders
358GitHub stars
What to know before exploring
What it is
SIMD (SSE) population count --- http://0x80.pl/articles/sse-popcount.html
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 5:04:57 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by year4 dated mentions
Observed mentions: 2016-03-13 18:02:27 UTC to 2026-04-16 19:22:10 UTC.
* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 2 | 0 | 2 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2026 (partial) | 2026-01-01 00:00:00 UTC | 2027-01-01 00:00:00 UTC | 1 | 1 | 0 |
What Hacker News says
4 sourcescool stuff! I was trying to do something similar on Arm Neon (m1 pro) with the CNT instruction
https://developer.arm.com/documentation/ddi0596/2020-12/SIMD...
I believe it does 128 bits per instruction, but I'm still struggling with rust w/ asm.
Along my journeys, however, I found this repo https://github.com/WojciechMula/sse-popcount/ which has tons of competing simd implementations for both intel and arm.
In Fast bitset decoding using Intel AVX-512The builtin POPCNT that came with Intel's SSE4 (SSE4a for AMD) is much faster. However, at a certain point, using AVX2 (and AVX-512 if present) is actually faster yet [1] - at least for 512 byte inputs or larger.
[1]: https://github.com/WojciechMula/sse-popcount
In Counting set bits in an interesting wayHi, author here. You're perfectly right, microbenchmarks have flaws. Procedures should be run for different data sizes (as I did years ago) and code should be compiled with different compilers. And of course the method described in the text is designed to deal with large data. Using it for counting bits in 64-bit value would be... not wise. :)
AVX2's speedup over POPCNT is not not big, but seems it's such due to my indolence/stupidity. I've just merged pull request by Simon Lindholm (https://github.com/WojciechMula/sse-popcount/pull/2) with manually unrolled loops and it made the AVX2 code faster 40% than POPCNT.
In AVX2 faster than native popcnt instruction on Haswell/Skylake