[LLVMdev] Status of LLVM ARM port

[Evan Cheng]

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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