[cfe-dev] exc_bad_instruction on arm

[Anton Smirnov]

Both Clang/LLVM 3.4 -> Clang/LLVM 3.5
And i will also try using MCJIT.

2014-09-17 18:56 GMT+06:00 Anton Smirnov <dev at antonsmirnov.name>:

> 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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