[LLVMdev] About user of bitcast/GEP instruction

[Jeremy Lakeman]

If a stack pointer is passed to another function it can't be promoted to a
register, as that function will need to load or store through the pointer.
But while these intrinsics look like functions, they aren't really.

On Fri, Jan 30, 2015 at 8:59 PM, guoqing zhang <gqzhang81 at gmail.com> wrote:

> Hi,
>
> In PromoteMemoryToRegister.cpp, it seems to rely on the fact that the only
> users of bitcast/GEP instruction are lifetime intrinsics
> (llvm.lifetime.start/end). I did some searching in llvm/test folder, it
> seems to be true.
>
> However, by reading LLVM IR manual, I don't see any restriction stated on
> the possible user of bitcast/GEP instruction. So my question is who impose
> the restriction ? Is it Clang ?
>
> Regards
> -guoqing
>
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