🧻 To open up 💻 To expand code

to unroll

1 7.9

To make a loop run faster by copying the code inside it several times

verb
/ʌnˈroʊl/

Specialized

: desenrollar

To improve performance, many compilers choose to unroll loops during optimization.
unrolled loop
unrolled iteration
unrolled inner loop

So you have you can unroll that that model in time.

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Examples

If we unroll the loop by two, we can achieve a slightly better scheduling of the instructions.

Academic text (1994)
By unrolling all three nested loops, all variables in the loop can be reused.

Academic text (1994)
The loop is on the length of the inner product and is unrolled by four.

Academic text (1994)
The degree of loop unrolling is generally limited by the number of registers available.

Academic text (1994)
For example, unrolling a loop by eight is equivalent to using a vector length of eight.

Academic text (1994)
The question is, "Can we get a higher level of performance by further unrolling the loop(s)?"

Academic text (1994)
Here all loops have been unrolled; this means that for every line in the code, the indices are constant.

Academic text (2000)
First, inner loops are unrolled to expose more independent instructions per iteration.

Academic text (1994)
In its simplest form, unrolling a loop amounts to a mini-vectorization of the loop.

Academic text (1994)
Before the application of any of the instruction scheduling techniques, inner loops are unrolled where heuristics suggest a benefit.

Academic text (1994)

Surface Forms

unroll infinitive

unrolled past

unrolled past participle

unrolling present participle

unrolls third person singular

Morphology

unroll = roll (semi-transparent) = un + roll

The programming sense is a metaphorical extension from the physical action of 'unrolling' (expanding), so the morphological relation is clear but the technical meaning may not be obvious to non-programmers.

Etymology

Unroll in programming uses the same idea: un- ('reverse') and roll ('to turn into a tube'). Think of a rolled map — you unroll it and lay it flat; in code, to unroll a loop is to copy its steps so the program repeats less work and runs faster.