[LLVMdev] llc -march=ia64 support

[Chris Lattner]

On Wed, 25 May 2005, Eric van Riet Paap wrote:
> Something related to this: to test the effect of 64 bits integers I 
> replace all reference of int by long in my .ll file. The work just fine 
> except for some instruction (like malloc) that demand an uint and not an 
> ulong. With the shift from the 32 to the 64 bit world, is this something 
> that will be enhanced in the future, or would that have to much impact 
> on the existing llvm codebase?

LLVM already supports 64-bit systems pretty well, including IA-64, Alpha 
and SparcV9.  There are minor vestigial issues that prevent allocation of 
some objects > 4GB in size (such as the above), but these will be fixed in 
time (sooner if we get help) :)

-Chris

> Duraid Madina wrote:
>
>> Hi there,
>>
>>     The IA64 architecture, which had its 'official' name changed to
>> the "Itanium Processor Architecture", *is* supported by llc. I am
>> pretty sure you are talking about the x86-64 architecture, which has
>> also had its share of unfortunate name changes and is also known as
>> "AMD64", "EM64T" and all sorts of things in between. x86-64 is *not*
>> currently supported by llc.
>>
>>     I am not aware of anyone working to add x86-64 support to llc, but
>> such support will probably come one day. The author of LLVM's x86
>> backend is enjoying some well-earned time off right now, so I think 4
>> weeks is probably a bit too optimistic, sorry about that. :(
>>
>>     Having said that, is there no way you can use the assembly that
>> results from passing "-march=x86" to llc? I think you should be able
>> to create a 32-bit "playground" on your x86-64 system, and build and
>> run LLVM and PyPy inside that. The idea here is to try and fool LLVM
>> into thinking it's running on a plain old x86 system. I'm pretty sure
>> this is possible, but it has been a long time since I last used an
>> x86-64 system, so I can't tell you exactly what you need to do.
>> Someone else on this list might be able to help you out, though.
>> (Markus, are you reading this? ;)
>>
>>
>>     Duraid
>>
>> Eric van Riet Paap wrote:
>>
>>> Hi,
>>>
>>> For the PyPy project ( http://codespeak.net/pypy ) I am working on the
>>> x64-64 support.
>>>
>>> I would like to use llc -march=ia64 to generate the assembly but that is
>>> not supported at the moment.
>>> As a workaround I let llc generate C code that gets compiled, but this
>>> unfortunately is not a good way
>>> to show the power of llvm. A understood this ia64 support will be worked
>>> on soon.
>>>
>>> First week of july there will be a pypy-sprint in Goteborg (Sweden)
>>> where the focus will be on translating Python code to other languages
>>> like LLVM,C,Lisp,Java,etc..
>>>
>>> Is there a change llc will support ia64 in about 4 weeks time or am I to
>>> optimistic?
>>>
>>> best regards
>>> Eric van Riet Paap
>>>
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>>
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-Chris

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