[LLVMdev] Status of LLVM ARM port

[kapil anand]

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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