[LLVMdev] Status of LLVM ARM port

[Evan Cheng]

Right. Those are not currently supported. Patches welcome. :-)

Evan

On Oct 10, 2008, at 2:07 PM, kapil anand wrote:

> Media instructions like - parallel add and subtract, Sign/Zero  
> Extend and Add instructions seem to be missing from ARM target  
> support. These instructions are not listed in GenInstrNames.inc
>
>
> Kapil
>
>
>
> On Fri, Oct 10, 2008 at 11:54 AM, Evan Cheng <evan.cheng at apple.com>  
> wrote:
>>
>> Can you give some examples of missing instructions?
>>
>> Evan
>>
>> On Oct 9, 2008, at 4:58 PM, kapil anand wrote:
>>
>>> I have a question regarding ARM support. It was mentioned in mails  
>>> below that LLVM supports ARM v6 but a lot of ARM v6 instructions  
>>> are actually missing from ARM ISA description files( e.g. Media  
>>> Instructions). Is there any documentation mentioning the  
>>> unsupported parts of v6 version
>>>
>>> Thanks
>>>
>>> --Kapil
>>>
>>>
>>> On Thu, Sep 18, 2008 at 2:14 PM, Evan Cheng <evan.cheng at apple.com>  
>>> wrote:
>>>>
>>>>
>>>> On Sep 17, 2008, at 3:00 PM, Tyler Wilson wrote:
>>>>
>>>>> Good day,
>>>>>
>>>>> I have looked around for this information, but I have not been  
>>>>> able to gain a clear understanding: what is the status of the  
>>>>> LLVM ARM backend? That is, do the following work:
>>>>>
>>>>
>>>>
>>>>
>>>>> 1.       Generating Thumb code: I saw a video online where they  
>>>>> describe an issue with using the ARM Thumb back-end
>>>>
>>>>
>>>> Thumb works. But it generate poor code.
>>>>
>>>>> 2.       Generating code for ARM9 (ARMv5?) or ARM7 (ARMv4):  
>>>>> again, the same presentation mentioned that it only generated  
>>>>> ARMv6 or 7. Does the back end work on older ARM processors today?
>>>>
>>>>
>>>> ARM v6 is known to work well. I am not sure about v4 and v5. They  
>>>> should mostly work, but I don't test them. There is no support  
>>>> for v7.
>>>>
>>>>>
>>>>> I have seen the notes on the Apple provided bits to the project,  
>>>>> but those were form early-mid 2007, and I have not seen a clear  
>>>>> declaration on what is marked as working or not.
>>>>
>>>>
>>>> There hasn't been a lot of activities in ARM target. Patches  
>>>> welcome!
>>>>
>>>> Evan
>>>>
>>>>>
>>>>> Thank you,
>>>>> Tyler
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>>>>
>>>>
>>>>
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>>
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