[cfe-dev] exc_bad_instruction on arm

[Anton Smirnov]

Hi, Tim.

I've used Clang 3.4 final release and now i'm going to test it with 3.5
release (since i've read about arm64 improvements).
I will report my results.

BTW, is it possible to get smth like "hello world" output even with apple
restrictions?

Regards, Anton.

2014-09-17 18:42 GMT+06:00 Tim Northover <t.p.northover at gmail.com>:

> Hi Anton,
>
> I've added the llvmdev list, since the issues you're seeing are coming
> from the backend, which is more their side.
>
> On 17 September 2014 08:43, Anton Smirnov <dev at antonsmirnov.name> wrote:
> > i've changed lli arguments to the next (instead of default):
> >
> > return llvm_interpret(
> >     InputFile,
> >     std::vector<std::string>(),
> >     false, // ForceInterpreter
> >     false, // UseMCJIT
> > [...]
> > Now i'm having:
> >
> > Unhandled instruction encoding format!
> > UNREACHABLE executed at
> >
> /Users/asmirnov/Documents/dev/src/llvm_34_ios/lib/Target/ARM/ARMCodeEmitter.cpp:547!
>
> This one at least is understandable. Your options imply (I couldn't
> find any "llvm_interpret" function, so there's some guesswork) that
> you're using the old JIT. That's been discouraged for a while, and
> it's  been removed completely now in trunk.
>
> It's entirely possible it could randomly fall over (not all
> instructions are supported), and probably not even worth worrying
> about why. I'd just flip that "UseMCJIT" option.
>
> The interpreter failure you were seeing earlier is harder to explain
> (there are various options), but if we're lucky it won't happen in
> MCJIT mode. Then we don't have to worry about that one either.
>
> Cheers.
>
> Tim.
>
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