• Leopold Walkling <leopold_walkling web.de> Jan 04 2007
• "Jarrett Billingsley" <kb3ctd2 yahoo.com> Jan 04 2007
• Leopold Walkling <leopold_walkling web.de> Jan 04 2007
• BCS <nothing pathlink.com> Jan 04 2007
• Frits van Bommel <fvbommel REMwOVExCAPSs.nl> Jan 04 2007
• Thomas Kuehne <thomas-dloop kuehne.cn> Jan 04 2007

Leopold Walkling <leopold_walkling web.de> writes:

What are those "pseudo-ops" in inline asm like db, dw, dd, dl, df... for?

"Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:

"Leopold Walkling" <leopold_walkling web.de> wrote in message 
news:enjsji$kjj$1 digitaldaemon.com...
 What are those "pseudo-ops" in inline asm like db, dw, dd, dl, df... for?


Doesn't your topic answer your question?

I guess they're for inserting static data without using D syntax.. 

Leopold Walkling <leopold_walkling web.de> writes:

Jarrett Billingsley schrieb:
 "Leopold Walkling" <leopold_walkling web.de> wrote in message 
 news:enjsji$kjj$1 digitaldaemon.com...
 What are those "pseudo-ops" in inline asm like db, dw, dd, dl, df... for?


 Doesn't your topic answer your question?
 
 I guess they're for inserting static data without using D syntax.. 
 
 


float into the machine code?

BCS <nothing pathlink.com> writes:

Leopold Walkling wrote:
 Jarrett Billingsley schrieb:
 "Leopold Walkling" <leopold_walkling web.de> wrote in message 
 news:enjsji$kjj$1 digitaldaemon.com...
 What are those "pseudo-ops" in inline asm like db, dw, dd, dl, df... 
 for?


 Doesn't your topic answer your question?

 I guess they're for inserting static data without using D syntax..


 float into the machine code?


for doing something like this in ASM;

float a, b;

a = b * 7.35235532;

or maybe

float[] arr;

arr[] = [cast(flost)####, ####, ####, ####];

Frits van Bommel <fvbommel REMwOVExCAPSs.nl> writes:

BCS wrote:
 Leopold Walkling wrote:
 Jarrett Billingsley schrieb:
 "Leopold Walkling" <leopold_walkling web.de> wrote in message 
 news:enjsji$kjj$1 digitaldaemon.com...
 What are those "pseudo-ops" in inline asm like db, dw, dd, dl, df... 
 for?


 Doesn't your topic answer your question?

 I guess they're for inserting static data without using D syntax..


 float into the machine code?


 for doing something like this in ASM;
 
 float a, b;
 
 a = b * 7.35235532;
 
 or maybe
 
 float[] arr;
 
 arr[] = [cast(flost)####, ####, ####, ####];


I think you'll find you'd put the floats into instructions that move 
them to the coprocessor (or whatever, never used floats from asm). But 
I'm pretty sure you wouldn't want to just paste the raw binary 
representation of a float into a spot where the cpu will expect a new 
instruction to start. That sounds like a recipe for disaster...

I guess those pseudo-ops are not very useful in an inline assembler. 
Though I suppose you could jump over them and use them as values in 
memory from other instructions[1].
Or you could use them to generate opcodes for (new) instructions that 
the compiler doesn't (yet) know about :)...


[1]: which is probably as good as useless, since you typically can't 
modify the code section, which is where they'd be stored...

Thomas Kuehne <thomas-dloop kuehne.cn> writes:

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Leopold Walkling schrieb am 2007-01-04:
 What are those "pseudo-ops" in inline asm like db, dw, dd, dl, df... for?


#
# These pseudo ops are for inserting raw data directly into the code. db
# is for bytes, ds is for 16 bit ...
#

sample: asm{inc EAX;} and asm{db 0x40;} result in the same output, because
the x86 encoding of "inc EAX" is 0x40.

Thomas

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