llvm dev - Jul 2019 - Fwd: bugpoint can't automatically select a safe interpreter!

> -----Original Message-----
> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of
Justin
> Bogner via llvm-dev
> Sent: Monday, July 22, 2019 11:44
> To: Jay Foad via llvm-dev <llvm-dev at lists.llvm.org>
> Subject: Re: [llvm-dev] Fwd: bugpoint can't automatically select a safe
> interpreter!
> 
> Bugpoint's user interface is notoriously complex. I'm not sure why
it's going
> the safe interpreter route instead of reducing the crash, but I'd
recommend
> trying the custom scripts approach in this article for reducing something
like
> this:
IIRC, bugpoint tries to initialize the execution environment (i.e., using the
JIT) before checking if the codegen phases crashes. So if you have a target that
doesn't support JIT execution, you're stuck using custom scripts
instead.

On Mon, 22 Jul 2019 at 17:03, Cranmer, Joshua via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
>
> > -----Original Message-----
> > From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf
Of Justin
> > Bogner via llvm-dev
> > Sent: Monday, July 22, 2019 11:44
> > To: Jay Foad via llvm-dev <llvm-dev at lists.llvm.org>
> > Subject: Re: [llvm-dev] Fwd: bugpoint can't automatically select a
safe
> > interpreter!
> >
> > Bugpoint's user interface is notoriously complex. I'm not sure
why it's going
> > the safe interpreter route instead of reducing the crash, but I'd
recommend
> > trying the custom scripts approach in this article for reducing
something like
> > this:
>
> IIRC, bugpoint tries to initialize the execution environment (i.e., using
the JIT) before checking if the codegen phases crashes. So if you have a target
that doesn't support JIT execution, you're stuck using custom scripts
instead.
Yeah but... it crashes in generic IR passes, so why would it get as
far as codegen?

Jay.

On 7/22/19 11:03 AM, Cranmer, Joshua via llvm-dev wrote:
>> -----Original Message-----
>> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of
Justin
>> Bogner via llvm-dev
>> Sent: Monday, July 22, 2019 11:44
>> To: Jay Foad via llvm-dev <llvm-dev at lists.llvm.org>
>> Subject: Re: [llvm-dev] Fwd: bugpoint can't automatically select a
safe
>> interpreter!
>>
>> Bugpoint's user interface is notoriously complex. I'm not sure
why it's going
>> the safe interpreter route instead of reducing the crash, but I'd
recommend
>> trying the custom scripts approach in this article for reducing
something like
>> this:
> IIRC, bugpoint tries to initialize the execution environment (i.e., using
the JIT) before checking if the codegen phases crashes. So if you have a target
that doesn't support JIT execution, you're stuck using custom scripts
instead.

bugpoint's defaults aren't good, unfortunately. You should just need to 
use the -llc-safe flag, and that will avoid the "can't automatically 
select a safe interpreter" error.

  -Hal

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-- 
Hal Finkel
Lead, Compiler Technology and Programming Languages
Leadership Computing Facility
Argonne National Laboratory

> You should just need to
> use the -llc-safe flag, and that will avoid the "can't
automatically
> select a safe interpreter" error.
Yes, that works too, thanks. It wasn't at all obvious from reading the
-help.

Jay.