[LLVMdev] Emulating an infinite register file in the backend

[nkavv at physics.auth.gr]

Hi Justin and all,

you've mentioned that you used an easy "trick" for defining an  
infinite register file in the backend.

Does this involve defining a single dummy register, and then adding  
this dummy reg to each register class? Is anything more needed? I  
refer to the RegisterInfo.td file, as e.g:  
llvm-3.0.src/lib/Target/PTX/PTXRegisterInfo.td

I'm (just starting) implementing an LLVM target that bares some  
similarities to PTX. One of these is the notion of infinite registers,  
since my target too is a kind of virtual/universal machine.

My target will not emit object files, so there i would prefer not to  
define a very larget register file and mess with formats. A bit-level  
format will at some point be defined but i don't want to fix it from  
now.

So your approach seems highly relevant.

Best regards
Nikolaos Kavvadias


Quoting Justin Holewinski <justin.holewinski at gmail.com>:

> configure:12131: $? = 0
> configure:12145: result: yes
> configure:12157: checking tool compatibility
> configure:12180: error: g++|clang++|icc required but not found
>
> configure can't find a c++ compiler.  On Ubuntu, please install g++ (sudo
> apt-get install g++).
>
> This error should have been written to your console when you ran configure.
>
>
>
> On Sun, Feb 10, 2013 at 8:35 AM, Manoj C <manoj.chinthala at gmail.com> wrote:
>
>> hello sir,
>>           i am using llvm compiler for my project.i an doing llvm
>> installation.i followed all the steps in the llvm website but after running
>> this command
>>
>> ../llvm/configure --enable-targets=host-only  it executed but it didnt
>> create any make file in build directory ,only config.log file is appeared
>> after running this command.
>>
>> after running the later command it is showing like this
>> manoj at ubuntu:~/Desktop/LLVM/
>> build$ make -j 4
>> make: *** No targets specified and no makefile found.  Stop
>>
>> please help me to finish installation. i am running installation in
>> ubuntu os.
>>
>> here is the config.log file ...
>>
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>>
>>
>
>
> --
>
> Thanks,
>
> Justin Holewinski
>