llvm dev - Nov 2015 - constant string as an assembly operand

Hello all,

how can one can describe a constant string as an operand in the assembly
instruction?

for example imagine this instruction:

xyz 14 ABC

where "xyz" is the operator, 14 is an immediate value, and because of
assembly dialect, there should be a constant string with the value of ABC
follow the immediate value. How is this possible?

What should be the dat describing the instruction?

string asm = "xyz $val ABC"
dag iops = (ins i8imm:val, ... )


Cheers,
ES
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On Thu, Nov 05, 2015 at 03:20:45PM +0100, Sky Flyer via llvm-dev
wrote:
> Hello all,
> 
> how can one can describe a constant string as an operand in the assembly
> instruction?
> 
> for example imagine this instruction:
> 
> xyz 14 ABC
> 
> where "xyz" is the operator, 14 is an immediate value, and
because of
> assembly dialect, there should be a constant string with the value of ABC
> follow the immediate value. How is this possible?
> 
> What should be the dat describing the instruction?
> 
> string asm = "xyz $val ABC"
Can this be an arbitrary string or will it always be ABC?  If it's the
later,
then what you've posted above should work for the asm string.

-Tom
> dag iops = (ins i8imm:val, ... )
> 
> 
> Cheers,
> ES
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

Hi Tom,

Thanks.
It should be always ABC.
What should be the iops? just (ins i8imm:$val)? what would be the
placeholder for a constant string in "ins"?



On Thu, Nov 5, 2015 at 4:33 PM, Tom Stellard <tom at stellard.net> wrote:
> On Thu, Nov 05, 2015 at 03:20:45PM +0100, Sky Flyer via llvm-dev wrote:
> > Hello all,
> >
> > how can one can describe a constant string as an operand in the
assembly
> > instruction?
> >
> > for example imagine this instruction:
> >
> > xyz 14 ABC
> >
> > where "xyz" is the operator, 14 is an immediate value, and
because of
> > assembly dialect, there should be a constant string with the value of
ABC
> > follow the immediate value. How is this possible?
> >
> > What should be the dat describing the instruction?
> >
> > string asm = "xyz $val ABC"
>
> Can this be an arbitrary string or will it always be ABC?  If it's the
> later,
> then what you've posted above should work for the asm string.
>
> -Tom
>
> > dag iops = (ins i8imm:val, ... )
> >
> >
> > Cheers,
> > ES
>
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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