[LLVMdev] need help understanding getelementptr assembler instruction

[Chris Lattner]

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!

-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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>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
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>>
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-Chris

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