llvm dev - Apr 2013 - [LLVMdev] Does DragonEgg support parameters like -fno-builtin in clang?

Hi chenwj,

Thanks! I have tried it, but the generated byte code still uses
`llvm.memset`. I guess the flag `-fno-builtin` is not used by DragonEgg, or
I missed some other
configuration parameters.


On Tue, Apr 9, 2013 at 7:45 PM, 陳韋任 (Wei-Ren Chen) <chenwj at
iis.sinica.edu.tw
> wrote:
> On Tue, Apr 09, 2013 at 04:39:14PM -0700, Jeff Jia wrote:
> > Hi,
> >
> > I have been using clang for quite a while, and I can use `clang
> -fno-builtin
> > hello.c` to prevent the generation of llvm built-in functions, such as
> > llvm.memset. Recently, I switched to gcc with DragonEgg, since the
> program to
> > be built is originally designed to be compiled with gcc. I searched on
> the web,
> > but did not find any information about how to set DragonEgg
parameters.
> Could
> > anyone please give me some help? Thanks in advance!
>
>   Dragonegg is a GCC plugin, I think you can just pass
"-fno-builtin"
> [1] to gcc. Doesn't it work?
>
> [1]
>
>
http://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Option-Summary.html#Option-Summary
>
> Regards,
> chenwj
>
> --
> Wei-Ren Chen (陳韋任)
> Computer Systems Lab, Institute of Information Science,
> Academia Sinica, Taiwan (R.O.C.)
> Tel:886-2-2788-3799 #1667
> Homepage: http://people.cs.nctu.edu.tw/~chenwj
>


-- 
Jeff Jia
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Hi,

I have figured out a way to achieve similar effects.

    gcc -S -c -O0 -fplugin=$(DRAGONEGG_SO) -fplugin-arg-dragonegg-emit-ir
hello.c -o hello.bc
    opt -O3 -disable-simplify-libcalls hello.bc -o hello.bc




On Wed, Apr 10, 2013 at 12:54 PM, Jeff Jia <fjia at cs.ucsd.edu> wrote:
> Hi chenwj,
>
> Thanks! I have tried it, but the generated byte code still uses
> `llvm.memset`. I guess the flag `-fno-builtin` is not used by DragonEgg, or
> I missed some other
> configuration parameters.
>
>
> On Tue, Apr 9, 2013 at 7:45 PM, 陳韋任 (Wei-Ren Chen) <
> chenwj at iis.sinica.edu.tw> wrote:
>
>> On Tue, Apr 09, 2013 at 04:39:14PM -0700, Jeff Jia wrote:
>> > Hi,
>> >
>> > I have been using clang for quite a while, and I can use `clang
>> -fno-builtin
>> > hello.c` to prevent the generation of llvm built-in functions,
such as
>> > llvm.memset. Recently, I switched to gcc with DragonEgg, since the
>> program to
>> > be built is originally designed to be compiled with gcc. I
searched on
>> the web,
>> > but did not find any information about how to set DragonEgg
parameters.
>> Could
>> > anyone please give me some help? Thanks in advance!
>>
>>   Dragonegg is a GCC plugin, I think you can just pass
"-fno-builtin"
>> [1] to gcc. Doesn't it work?
>>
>> [1]
>>
>>
http://gcc.gnu.org/onlinedocs/gcc-4.8.0/gcc/Option-Summary.html#Option-Summary
>>
>> Regards,
>> chenwj
>>
>> --
>> Wei-Ren Chen (陳韋任)
>> Computer Systems Lab, Institute of Information Science,
>> Academia Sinica, Taiwan (R.O.C.)
>> Tel:886-2-2788-3799 #1667
>> Homepage: http://people.cs.nctu.edu.tw/~chenwj
>>
>
>
>
> --
> Jeff Jia
>
>

-- 
Jeff Jia
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On Wed, Apr 10, 2013 at 03:06:38PM -0700, Jeff Jia
wrote:
> Hi,
> 
> I have figured out a way to achieve similar effects.
> 
>     gcc -S -c -O0 -fplugin=$(DRAGONEGG_SO) -fplugin-arg-dragonegg-emit-ir
> hello.c -o hello.bc
>     opt -O3 -disable-simplify-libcalls hello.bc -o hello.bc
  I guess "-fno-built-in" does not prevent dragonegg emitting
"llvm"
builtin. Nice try. :)

Cheers,
chenwj

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj