A faster way to compute signed 64-bit floor division by constants
Comments on “A faster way to compute signed 64-bit floor division by constants”
3 judges. Scored by all three judges. Only the day’s top stories get the claim check. How far stories are checked
A technical write-up presents a faster method for signed 64-bit floor division (rounding toward negative infinity) when the divisor is a compile-time constant. Existing compilers and many libraries lack native floor division or use slow algorithms, and Hacker's Delight says little about it.
Why it ranked
No. 48 of 124 with a score of 0.62. The panel rated it highest on technical depth (0.97) and new information (0.94), lowest on audience breadth (0.45).
Every answer behind this is in the table under Score.
Score
0.62total under rubric v2.2
- Significance0.51
- Reader interest0.74
- Audience breadth0.45
- Practical relevance0.73
- Substantiated0.81
- Technical depth0.97
- New information0.94
- Counts against: Promotional0.05
- Counts against: Overclaim0.34
Each judge’s answer per question (0–1), their mean and spread, and what the question adds to the score (weight × mean).
| Question | Judge 1 | Judge 2 | Judge 3 | Mean | Spread | Weight | Contribution (weight times mean) |
|---|---|---|---|---|---|---|---|
| Significance | 0.51 | 0.40 | 0.62 | 0.51 | 0.22 | +0.24 | +0.122 |
| Reader interest | 0.60 | 0.72 | 0.90 | 0.74 | 0.30 | +0.26 | +0.192 |
| Audience breadth | 0.54 | 0.42 | 0.38 | 0.45 | 0.16 | +0.13 | +0.058 |
| Practical relevance | 0.78 | 0.70 | 0.72 | 0.73 | 0.08 | +0.22 | +0.161 |
| Substantiated | 0.89 | 0.72 | 0.82 | 0.81 | 0.17 | +0.05 | +0.040 |
| Technical depth | 1.00 | 0.92 | 0.98 | 0.97 | 0.08 | +0.05 | +0.048 |
| New information | 0.94 | 0.90 | 0.98 | 0.94 | 0.08 | +0.05 | +0.047 |
| Promotional | 0.07 | 0.05 | 0.03 | 0.05 | 0.04 | −0.19 | −0.010 |
| Overclaim | 0.55 | 0.30 | 0.18 | 0.34 | 0.37 | −0.11 | −0.038 |
| Sum of contributions | +0.622 | ||||||
| Claim-check penalty | 0.000 | ||||||
| Total, as published | 0.622 | ||||||
Spread is the highest minus the lowest judge answer. marks a spread above 0.40: the judges disagree, and the story is marked contested.
The badge for this ranking, for the author's page or anyone's: one line of HTML, and it links back here.
<a href="https://rubric.hrih.si/editions/2026-10-27/48/"><img src="https://rubric.hrih.si/badge/2026-10-27/48.svg" alt="Ranked #48 on Rubric, 27 Oct 2026" width="245" height="28"></a>Also covered by
No other coverage was clustered with this story.
Elsewhere
Elsewhere: HN 5 pts, not on front page
Recorded for context only, checked 27 Oct 2026, 05:46 UTC. It played no part in the ranking.