hand cruft = H = hand-roll

hand-hacking n.

1. [rare] The practice of translating hot spots from an HLL into hand-tuned assembler, as opposed to trying to coerce the compiler into generating better code. Both the term and the practice are becoming uncommon. See tune, bum, by hand; syn. with v. cruft. 2. [common] More generally, manual construction or patching of data sets that would normally be generated by a translation utility and interpreted by another program, and aren't really designed to be read or modified by humans.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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