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The Weird Concept of Branchless Programming

(sanixdk.xyz)
170 points judicious | 1 comments | 28 Sep 25 16:40 UTC | HN request time: 0s | source
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mwkaufma ◴[28 Sep 25 22:10 UTC] No.45408552[source]▶
Is cmov branchless, or just branching by another name?
replies(3): >>45409160 #>>45409795 #>>45410660 #
1. teo_zero ◴[29 Sep 25 05:47 UTC] No.45410660[source]▶
CMOV is branchless. During all steps of its execution, the CPU doesn't have to invalidate any stage of its pipeline (well, excluding errors like accessing forbidden memory addresses, etc.).