[llvm-dev] Standard way to remove llvm intrinsics

Eric Christopher via llvm-dev llvm-dev at lists.llvm.org
Wed Dec 18 13:40:12 PST 2019

Not a lot of us use the interpreter unfortunately - probably best to just
change it to ignore those intrinsics rather than error or try to remove


On Wed, Dec 18, 2019 at 12:00 AM Alberto Barbaro <barbaro.alberto at gmail.com>

> Hi Eric,
> Currently I'm mainly playing with interpreter and trying to understand how
> it exactly works. I have noticed that lli complains when llvm.dbg.value is
> encounter that why I wanted to remove it. Additionally, I would like to
> understand that performances with and without intrinsics and the impact
> they have on the interpreter in general.
> Thanks
> Alberto
> On Wed, Dec 18, 2019, 00:33 Eric Christopher <echristo at gmail.com> wrote:
>> Typically this isn't done, debug information is a bit of a special case.
>> I don't see much of a reason to have tool support for this necessarily, but
>> would be happy to hear about possible use cases etc?
>> Thanks!
>> -eric
>> On Mon, Dec 16, 2019 at 12:04 PM Alberto Barbaro via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>> Hi all,
>>> it is not the first time that I need to remove intrinsics from a bc and
>>> in the past I saw options like -strip-debug for opt. Now I would like to
>>> remove all the occurrences of llvm.lifetime.start and llvm.lifetime.end. I
>>> have done in just obtaining the .ll file, grep -v lifetime, redirecting it
>>> to another .ll and use llvm-as.
>>> I was wondering if there is a standard way to decide which intrinsics to
>>> remove or if at the moment it is not possible.
>>> Thanks
>>> Alberto
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>>> llvm-dev at lists.llvm.org
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