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Message
From: Joachim Strömbergson<Joachim.Strombergson@I...>
Date: Tue Aug 17 11:01:48 CEST 2004
Subject: [oc] Parallel Array Processor Project
Aloha!markus@r... wrote:
>>You mean you have a pcode generator? ;-)
>
> Well, I didn't quite follow this... Most parsers/compilers (including most
> of my compiler constructions and the current PM HLL compiler) convert
> the mixed prefix/infix notation (function calls, infix operators) to a
> postfix, stack-based code. Then, for conventional processors, a register
> allocation is done and the compiled code is emitted.
Which is called p-code after the UCSD p-code machine. Used heavily in the
early compiler research and was related to Pascal. See:
http://en.wikipedia.org/wiki/P-Code_machine
http://en.wikipedia.org/wiki/Pascal_programming_language
http://www.fact-index.com/p/p_/p_code_machine.html
Normally though you use the p-code to build trace trees and then optimize on
them, perform register allocation, instruction selection, new optimization
pass etc etc before generating code for the non-stack-processor. Unless the
target is a stack machine like Python or Java byte code etc.
> I know - what a mess :-( But, the assembler programming is much
> harder for larger applications than programming tweaked C code... :-/
That's why people buy a faster DSP instead and take the overhead [1], esp for
first, second product releases. Converting code to assembler and other
optimizations are saved for nmanufacturing cost reduction after the product
have successfully been released onto the market.
[1] And if you look at TI 6000, AD TigerSHARC etc, most programmers have a
hard time beating the performance reached by the compilers by hand writing
asssembler. Few people are able to easily grok multiple executin, instruction
pairing. This is especially true if the architecture is non-orthogonal which
introduces lots of rules for instruction scheduling, register allocation,
instruction pairing, pipeline allocation etc etc.
--
Med vänlig hälsning, Yours
Joachim Strömbergson - Alltid i harmonisk svängning.
VP, Research & Development
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