[LLVMdev] Status of LLVM ARM port

[kapil anand]

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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