Path: utzoo!attcan!uunet!mcvax!enea!dkuug!daimi!erja
From: erja@daimi.dk (Erik Jacobsen)
Newsgroups: comp.lang.pascal
Subject: Re: Optimized pascal?
Message-ID: <1726@daimi.dk>
Date: 3 Nov 88 11:30:13 GMT
References: <111.2364151B@medsoft.uucp>
Reply-To: erja@daimi.dk (Erik Jacobsen)
Organization: DAIMI: Computer Science Department, Aarhus University, Denmark
Lines: 41


In article <111.2364151B@medsoft.uucp> Joaquim Homrighausen writes:
>This must be it - the new optimizing Turbo Pascal compiler.. 
>I've just spend about an hour running a short routine through 
>the debugger and saw something quite interesting:
>
>mov  [bp-3], al
>mov  al, [bp-3]
>
>..pretty darn optimized.. I know I'm not the best programmer at 
>times, but this is ridiculous for a compiler to generate.. sure, 
>if they would support something like C's VOLATILE keyword, but 
>this..

Not always! If there is a jump to the second mov, e.g.

         mov [bp-3],al
  label: mov al,[bp-3]
         ...
         jmp label

there isn't much the compiler can do to avoid the mov.

>  regards,
>    joaquim
>
>
>--  
>Joaquim Homrighausen - via FidoNet node 1:135/3
>Medical Software Exchange BBS (305) 325-8709
>UUCP: ...uunet!gould!umbio!medsoft!20!Joaquim.Homrighausen

   Regards,
      Erik

---------------------------------------------------------------------
Erik Jacobsen                      erja@daimi.dk (or erja@daimi.uucp)
Computer Science Department        Phone:     +45 6 12 71 88
Aarhus University
DK-8000 Aarhus, Denmark
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