[LLVMdev] need help understanding getelementptr assembler instruction

[Reid Spencer]

On Mon, 2006-11-13 at 09:51 +0100, Eric van Riet Paap wrote:
> On Nov 13, 2006, at 9:01 AM, Reid Spencer wrote:
> 
> > On Mon, 2006-11-13 at 01:10 -0800, Chris Lattner wrote:
> >> On Mon, 13 Nov 2006, Eric van Riet Paap wrote:
> >>> I must say I also was in need of this document but never knew it
> >>> existed. It seems to be linked from the faq page only. I only read
> >>> that the first day I came to LLVM. Maybe linking it from the
> >>> GetElementPtr instruction in LangRef.html would make sense.
> >>
> >> That makes a tremendous amount of sense to me!
> >
> > It's already there. Go to the bottom of the GEP instruction definition
> > in LangRef.html and you will find it.  I'm going to add it to the  
> > index
> > page too.
> 
> You are right, sorry, I must have missed it a million times then. :-)  
> or maybe it was added in the last year or so?

A few months ago, yes.

> 
> Eric
> 
> >
> > Reid.
> >
> >>
> >> -Chris
> >>
> >>> On Nov 12, 2006, at 8:47 PM, Reid Spencer wrote:
> >>>
> >>>> Ram,
> >>>>
> >>>> Please read and understand the GetElementPtr FAQ available here:
> >>>>
> >>>> http://llvm.org/docs/GetElementPtr.html
> >>>>
> >>>> That will help you understand how it works. We wrote that document
> >>>> specifically because this question comes up all the time.
> >>>>
> >>>> Reid.
> >>>>
> >>>> On Sun, 2006-11-12 at 11:13 -0800, Ram Bhamidipaty wrote:
> >>>>> I am trying to understand the hello word assember example. This is
> >>>>> my version:
> >>>>>
> >>>>> %str1 = internal constant [13 x sbyte] c"Hello World\0a\00"
> >>>>>
> >>>>> declare int %printf(sbyte*, ...)
> >>>>>
> >>>>> implementation   ; Functions:
> >>>>>
> >>>>> int %main() {
> >>>>>   %str2 = getelementptr [13 x sbyte]* %str1, long 0, long 0
> >>>>>   call int(sbyte*, ...) *%printf(sbyte* %str2)
> >>>>>   ret int 0
> >>>>> }
> >>>>>
> >>>>> Why is getelementptr being given two "long 0" indices?
> >>>>>
> >>>>> Thanks for any help.
> >>>>> -Ram
> >>>>> _______________________________________________
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> >>>>
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> >>>
> >>
> >> -Chris
> >>
> >
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