llvm dev - Apr 2010 - [LLVMdev] Creating a GEP instruction.

Hi,

   I'm trying to create a GEP (inbounds) instruction . I was looking at the
createinboundsGEP method . I didnt get the inputiterator part. My question
how do i create a GEP instruction and what do i pass for the input iterator
arguments.

Thanks,
Rohith.
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On Sun, Apr 25, 2010 at 5:15 PM, Rohith Goparaju <rgoparaj at
umail.iu.edu> wrote:
>  Hi,
>
>    I'm trying to create a GEP (inbounds) instruction . I was looking at
the
> createinboundsGEP method . I didnt get the inputiterator part. My question
> how do i create a GEP instruction and what do i pass for the input iterator
> arguments.
Generic answer to "how do I create an X instruction": use llc
-march=cpp on an IR file containing the instruction, and read the
result.

For this particular question, the simplest way to get appropriate
iterators is to put the indices into an std::vector and pass in the
.begin() and .end() of it.

-Eli

Thanks. The problem i'm facing is i want to get the address of the first
element of an array and i have also tried using the createInBoundsGEP which
takes the base pointer and the index value and a name. When i try passing
'0' as the index im running into problems.

Thanks,
Rohith.

On Sun, Apr 25, 2010 at 10:27 PM, Eli Friedman <eli.friedman at
gmail.com>wrote:
> On Sun, Apr 25, 2010 at 5:15 PM, Rohith Goparaju <rgoparaj at
umail.iu.edu>
> wrote:
> >  Hi,
> >
> >    I'm trying to create a GEP (inbounds) instruction . I was
looking at
> the
> > createinboundsGEP method . I didnt get the inputiterator part. My
> question
> > how do i create a GEP instruction and what do i pass for the input
> iterator
> > arguments.
>
> Generic answer to "how do I create an X instruction": use llc
> -march=cpp on an IR file containing the instruction, and read the
> result.
>
> For this particular question, the simplest way to get appropriate
> iterators is to put the indices into an std::vector and pass in the
> .begin() and .end() of it.
>
> -Eli
>
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