[DUG] Assembler

[Todd]

Hi Paul

so this works

movl TSparseList.FList, %eax

but I don't think it is the equivalent of the original statement

Function TSparseList.ForAll( ApplyFunction: Pointer {TSPAApply} ): 
Integer; assembler;
Asm
   MOV     EAX,[EAX].TSparseList.FList
   JMP     TSparsePointerArray.ForAll
End;

After some reading, it seems the EAX register initially contains the 
memory address of the data block occupied by the TSparseList instance. 
So I'm wondering if this would work.

addl TSparseList.FList, %eax

Any suggestions?

Todd.
> movl 12(%eax), %eax
>    
>> So I could do something like this?
>>
>> i := integer(@TSparseList(nil).FList);
>> movl i(%eax), %eax
>>      
> Unfortunately, no. You'd get the offset you want, but you can only use
> constants in inline assembler, and I don't think delphi or freepascal
> will consider your previous line to be a valid constant.
>
> So you'd need to write some code to determine all your offsets and then
> set up constants for them all.
>
>    
>> The x86_64 version of FPC doesn't seem to like the BASM
>> syntax, otherwise I wouldn't touch it. Or at least I can't
>> figure out how to force FPC to compile it. The directive
>> {$asmmode intel}  doesn't seem to work.
>>      
> Bugger - especially as their x86 BASM syntax already supports the
> structure member offset extension. And from the (somewhat terse)
> freepascal documentation, I don't think there is an equivalent in AT&T
> syntax.
>
> What kind of error messages are you getting? In 64-bit assembler, all
> the registers commonly have different names (e.g. rax as opposed to to
> eax). Maybe their assembler is fussy about that sort of thing?
>
> Is the x86_64 not support intel syntax a known limitation of freepascal?
> It's not mentioned on the site anywhere I can see.
>
> Cheers,
>    Paul.
>
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