[convolvatron]

i'm assuming you mean 'lazy' in the context of the paper and not more a general system of lazy evaluation. what was in particular that you found difficult about binding pure functions under the notion of a xapping? thanks so much for posting your work

[heisig]

Implementing lazy arrays or xappings naively is easy - the Petalisp reference backend has just 94 lines of code [1]. The challenge is to implement them efficiently. With eager evaluation, the programmer describes more or less precisely what the computer should do. With lazy evaluation, you only get a description of what should be done, with almost no no restriction on how to do it. To make lazy evaluation of arrays as fast as eager evaluation, you have to automate many of the high-level reasoning steps of an expert programmer. Doing so is extremely tedious, but once you have it you can write really clean and simple programs and still get the performance of hand-crafted wizard codes.

[1] https://github.com/marcoheisig/Petalisp/blob/master/code/cor...

[jojohohanon]

Are you referencing strictness analysis?