[llvm-dev] Help on finding Base GEP

[Siddharth Bhat via llvm-dev]

You can run SCEV which will see through bitcasts and GEPs, so it should
give an expression of the form (base + offset) on the pointer of the load.

Cheers
siddharth

On Wed 30 May, 2018, 16:30 Venkataramanan Kumar via llvm-dev, <
llvm-dev at lists.llvm.org> wrote:

> Hi,
>
> Below is the snippet of  LLVM IR code generated by Flang
>
> ---snip--
>   %3 = getelementptr i64, i64* %"a$sd", i64 11, !dbg !16
>   %4 = bitcast i64* %3 to i32*, !dbg !16
>   %5 = load i32, i32* %4, align 4, !dbg !16, !tbaa !22
> ---snip--
>
> My requirement is for any such LoadInst (example: %5),  I want to check if
> its base GEP (i.e. %3) loads at particular offset (11) from its
> corresponding arrays descriptor structure (a$sd).
>
> is there any API in LLVM to check this? or I need to write my own?
>
> regards,
> Venkat.
>
>
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-- 
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