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Why is the x86 undefined instruction called ud2? Why 2?

Hacker News Best / 13 September 2026 / 9h ago
Why is the x86 undefined instruction called ud2? Why 2?
Culture Index
61
Score Breakdown
Relevance
3/25
Freshness
25/25
Authority
18/20
Brand Signal
13/15
Depth
2/15
5-Axis Cultural Radar
Relevance Freshness Authority Brand Depth
Article URL: https://devblogs.microsoft.com/oldnewthing/20260910-00/?p=112689 Comments URL: https://news.ycombinator.com/item?id=49683262 Points: 161 # Comments: 39
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