llvm dev - Nov 2010 - [LLVMdev] Is it possible to run llvm on mips machine?

On Wed, Nov 17, 2010 at 12:11 AM, Bruno Cardoso Lopes
<bruno.cardoso at gmail.com> wrote:
> Hi,
>
> On Sun, Nov 14, 2010 at 5:39 AM, Michael.Kang <blackfin.kang at
gmail.com> wrote:
>> I like to get the support of llvm runtime so that I can run some VM
>> that depends on llvm. I googled porting keyword
>> and also simply try to cross compile llvm. Just like to know is it
>> possbile ? Does any modification needed?
>
> You can compile and run llvm tools in a mips machine, but mips+JIT is
> not supported.
If I like to do some investigation on the MIPS JIT or some exercise
development on MIPS JIT. Where should I begin? Or what is it's current
status?
I am a completely newbie for llvm development. Just ever used X86 JIT
to simulate something.

Thanks
MK
>
> --
> Bruno Cardoso Lopes
> http://www.brunocardoso.cc
>


-- 
www.skyeye.org

Hi,

There are numerous emails flying around the list at the moment regarding the
state of the JIT. In its current state it is infeasible to add support for
another architecture (very difficult to say the least) - there are plans
currently being formulated to deal with this and convert the JIT to the new MC
architecture, which would allow much easier porting between platforms.

Have a look for the subject "[LLVMdev] MC-JIT Design".

Also, what sort of memory footprint would you require to use the JIT on a MIPS
target? The JIT currently (and the next incarnation is also likely to) pulls in
an awful lot of fat LLVM libraries that cause a JIT-based compiler to be 8MB-up
on x86. MIPS would be substantially larger than this due to its RISC instruction
set.

James Molloy
Graduate Compiler Engineer, ARM Ltd.

> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu]
> On Behalf Of Michael.Kang
> Sent: 17 November 2010 05:23
> To: Bruno Cardoso Lopes
> Cc: llvmdev
> Subject: Re: [LLVMdev] Is it possible to run llvm on mips machine?
>
> On Wed, Nov 17, 2010 at 12:11 AM, Bruno Cardoso Lopes
> <bruno.cardoso at gmail.com> wrote:
> > Hi,
> >
> > On Sun, Nov 14, 2010 at 5:39 AM, Michael.Kang
> <blackfin.kang at gmail.com> wrote:
> >> I like to get the support of llvm runtime so that I can run some
VM
> >> that depends on llvm. I googled porting keyword
> >> and also simply try to cross compile llvm. Just like to know is it
> >> possbile ? Does any modification needed?
> >
> > You can compile and run llvm tools in a mips machine, but mips+JIT is
> > not supported.
> If I like to do some investigation on the MIPS JIT or some exercise
> development on MIPS JIT. Where should I begin? Or what is it's current
> status?
> I am a completely newbie for llvm development. Just ever used X86 JIT
> to simulate something.
>
> Thanks
> MK
>
> >
> > --
> > Bruno Cardoso Lopes
> > http://www.brunocardoso.cc
> >
>
>
>
> --
> www.skyeye.org
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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On Wed, Nov 17, 2010 at 4:30 PM, James Molloy <James.Molloy at arm.com>
wrote:
> Hi,
>
> There are numerous emails flying around the list at the moment regarding
the state of the JIT. In its current state it is infeasible to add support for
another architecture (very difficult to say the least) - there are plans
currently being formulated to deal with this and convert the JIT to the new MC
architecture, which would allow much easier porting between platforms.
>
> Have a look for the subject "[LLVMdev] MC-JIT Design".
Yes, I read it and still need some time to understand it.
>
> Also, what sort of memory footprint would you require to use the JIT on a
MIPS target? The JIT currently (and the next incarnation is also likely to)
pulls in an awful lot of fat LLVM libraries that cause a JIT-based compiler to
be 8MB-up on x86. MIPS would be substantially larger than this due to its RISC
instruction set.
>
I will use it on a MIPS PC Which have typically more than one Gigebyte
memory. Anyway, I think I should spend some time to understand MC-JIT
more.

Thanks
MK
> James Molloy
> Graduate Compiler Engineer, ARM Ltd.
>
>
>> -----Original Message-----
>> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu]
>> On Behalf Of Michael.Kang
>> Sent: 17 November 2010 05:23
>> To: Bruno Cardoso Lopes
>> Cc: llvmdev
>> Subject: Re: [LLVMdev] Is it possible to run llvm on mips machine?
>>
>> On Wed, Nov 17, 2010 at 12:11 AM, Bruno Cardoso Lopes
>> <bruno.cardoso at gmail.com> wrote:
>> > Hi,
>> >
>> > On Sun, Nov 14, 2010 at 5:39 AM, Michael.Kang
>> <blackfin.kang at gmail.com> wrote:
>> >> I like to get the support of llvm runtime so that I can run
some VM
>> >> that depends on llvm. I googled porting keyword
>> >> and also simply try to cross compile llvm. Just like to know
is it
>> >> possbile ? Does any modification needed?
>> >
>> > You can compile and run llvm tools in a mips machine, but mips+JIT
is
>> > not supported.
>> If I like to do some investigation on the MIPS JIT or some exercise
>> development on MIPS JIT. Where should I begin? Or what is it's
current
>> status?
>> I am a completely newbie for llvm development. Just ever used X86 JIT
>> to simulate something.
>>
>> Thanks
>> MK
>>
>> >
>> > --
>> > Bruno Cardoso Lopes
>> > http://www.brunocardoso.cc
>> >
>>
>>
>>
>> --
>> www.skyeye.org
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
> -- IMPORTANT NOTICE: The contents of this email and any attachments are
confidential and may also be privileged. If you are not the intended recipient,
please notify the sender immediately and do not disclose the contents to any
other person, use it for any purpose, or store or copy the information in any
medium.  Thank you.
>


-- 
www.skyeye.org

On Nov 17, 2010, at 12:30 AM, James Molloy wrote:
> Hi,
> 
> There are numerous emails flying around the list at the moment regarding
the state of the JIT. In its current state it is infeasible to add support for
another architecture (very difficult to say the least) - there are plans
currently being formulated to deal with this and convert the JIT to the new MC
architecture, which would allow much easier porting between platforms.
> 
I think infeasible is probably too strong a word. In fact, it would be just as
easy to do support in the existing JIT for mips as it would be to add MC work
for the target. That said, I'd probably add MC support for the target since
that'll be the way forward and will hopefully get a lot of the JIT support
for free-ish.
> Have a look for the subject "[LLVMdev] MC-JIT Design".
> 
> Also, what sort of memory footprint would you require to use the JIT on a
MIPS target? The JIT currently (and the next incarnation is also likely to)
pulls in an awful lot of fat LLVM libraries that cause a JIT-based compiler to
be 8MB-up on x86. MIPS would be substantially larger than this due to its RISC
instruction set.
> 
Most MIPS targets these days can have some pretty hefty ram -, he could be
wanting to JIT on an old SGI machine, my last one had 8GB of ram :)

That said most of the embedded linux boards will generally ship with about a GB
or 4.

-eric