• Zarathustra (7/7) Feb 13 2009 I need to make some calculations with asm in D.
• Daniel Keep (10/17) Feb 13 2009 I find the 'need' hard to believe. The only way you would need to use
• Zarathustra (2/26) Feb 13 2009
• Frits van Bommel (21/28) Feb 13 2009 First of all: unless you really need to detect overflow or something (or...

Zarathustra <adam.chrapkowski gmail.com> writes:

I need to make some calculations with asm in D.
Could somebody write how to do this, micro tutorial ;p
x86
Especially inc, dec, add, sub, mul, imul, div, idiv instructions.
Also ja, jb, jg, jl, jo; jc ...
and, or, not, xor,
sal, shl, sar, shr

Daniel Keep <daniel.keep.lists gmail.com> writes:

Zarathustra wrote:
 I need to make some calculations with asm in D.
 Could somebody write how to do this, micro tutorial ;p

I find the 'need' hard to believe.  The only way you would need to use
assembler is if you're doing something really low level and complicated,
in which case a 'micro tutorial' is going to be about as much help as a
zeppelin.

 x86
 Especially inc, dec, add, sub, mul, imul, div, idiv instructions.
 Also ja, jb, jg, jl, jo; jc ...
 and, or, not, xor,
 sal, shl, sar, shr

http://digitalmars.com/d/1.0/iasm.html

http://en.wikibooks.org/wiki/X86_Assembly

If that isn't enough information, then you shouldn't be programming in
assembly.

  -- Daniel

Zarathustra <adam.chrapkowski gmail.com> writes:

Thanks a lot :)

Daniel Keep Wrote:

 
 Zarathustra wrote:
 I need to make some calculations with asm in D.
 Could somebody write how to do this, micro tutorial ;p

 
 I find the 'need' hard to believe.  The only way you would need to use
 assembler is if you're doing something really low level and complicated,
 in which case a 'micro tutorial' is going to be about as much help as a
 zeppelin.
 
 x86
 Especially inc, dec, add, sub, mul, imul, div, idiv instructions.
 Also ja, jb, jg, jl, jo; jc ...
 and, or, not, xor,
 sal, shl, sar, shr

 
 http://digitalmars.com/d/1.0/iasm.html
 
 http://en.wikibooks.org/wiki/X86_Assembly
 
 If that isn't enough information, then you shouldn't be programming in
 assembly.
 
   -- Daniel

Frits van Bommel <fvbommel REMwOVExCAPSs.nl> writes:

Zarathustra wrote:
 I need to make some calculations with asm in D.
 Could somebody write how to do this, micro tutorial ;p
 x86
 Especially inc, dec, add, sub, mul, imul, div, idiv instructions.
 Also ja, jb, jg, jl, jo; jc ...
 and, or, not, xor,
 sal, shl, sar, shr

First of all: unless you really need to detect overflow or something (or 
just want to learn about asm), I'd recommend doing calculations in D and 
letting the compiler worry about what asm to generate. It'll likely be 
able to do a better job.


Otherwise:

If you look up those instructions (plus MOV) you should be well on your 
way, if all you want to do is calculations.

The NASM manual used to have a pretty good overview of instructions and 
what they did (including implicit register usage etc.) in appendix B. 
Recent versions seem to have cut this from the manual for some reason, 
but there are still some places where the old version can be found, such 
as <http://home.comcast.net/~fbkotler/nasmdoc0.html> (thank you, Google).
Besides looking up the instructions themselves in B.4.*, you may also 
want to look at the first sections (B.1 to B.2.4) for notations used, 
condition codes, and status flags.

Alternatively, the Intel and AMD processor manuals contain much the same 
information and pdf files can be downloaded (for free) from their 
respective websites.

Note that IIRC all these documents document condition code jumps 
(ja/jb/jg/jl/jo/jc etc.) as Jcc.