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NNTP-Posting-Date: Sat, 27 Oct 2012 14:38:40 -0500
From: Chris Hinsley <chris.hinsley@gmail.com>
Newsgroups: comp.lang.forth
Date: Sat, 27 Oct 2012 20:38:40 +0100
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Xref: csiph.com comp.lang.forth:16785

On 2012-10-27 19:33:45 +0000, Chris Hinsley said:

>> 
>> : < ( 2 -- 1 )
>> \ ' nseopt compiles; code=$4014DF len=9 type=1
>> \ defined in src\kernel\gkernel32.f at line 574
>> ( $0 )    sub     dword { $0 ebp } eax              \ 294500
>> ( $3 )    cdq                                       \ 99
>> ( $4 )    mov     eax edx                           \ 8BC2
>> ( $6 )    add     ebp $4                            \ 83C504
>> ( $9 )    ret                                       \ C3 ( end ) ok
> 
> Here your wringting back the result of the subtract to [ebp], which is 
> not required, wasting memory bandwidth. Why not change it to a 'cmp 
> [ebp], eax' ?
> 
> I like the trick with cdq ! Neat !
> 
> Chris

Hang on, I may have got my src and dest back to front ! Sorry, it 
actually subtrating [ebp] from eax ! And then setting edx to 0/-1 by 
extending the top bit of eax !

Apologies !

Chris