My CPU

Homebrew CPU construction / házi készítésű processzor

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Overcoming Some Limitations

2014.08.19. 21:00 Budapesti álmodozó

The FunCPU (in its current version) supports only numerical computation, more precisely, operations with integers. Functional languages, such as Lisp, Clean, etc. come with a richer set of data types and also have some kind of type construct capability. For example, Lisp as its name suggests mainly…

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Címkék: records lists functional programming FunCPU functional cpu overcoming limitations

Evaluating 1+1

2014.08.16. 22:00 Budapesti álmodozó

It is high time we turned our attention to a complex mathematical problem. Namely, how FunCPU computes:1+1=? Please recall that the definition of "add" is stored at 00 (referenced by 81) is as follows:add(x,y):=   FD 7F 7E FC 81 7E FE 7F FF The following is an extract from the FunCPU…

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Címkék: evaluation functional programming FunCPU functional cpu function evaluation

On (in)Efficiency of FunCPU

2014.08.11. 21:45 Budapesti álmodozó

On Data and Program Representation The computation (expression reduction) process is based on string manipulations (copy, insert, replace, etc.). The input string is scanned symbol by symbol until the string is reduced to an integer. This may happen in some cases, but may not in others. In the…

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Címkék: efficiency functional programming FunCPU reduction process expression evaluation

Some Functions and Predicates

2014.08.07. 21:48 Budapesti álmodozó

Let us have a look at some elementary functions and predicates to have a better look and feel how FunCPU works. The definitions of these objects will be suppmented with their assembly code counterparts written directly in FunCPU machine code. In the subsequent section, the following encoding is…

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Címkék: functions functional programming Turing-complete FunCPU predicates functional cpu