[LLVMdev] LLVM interpreter does not support fmod

[陳韋任]

Hi,

> It seems llvm interpreter only supports a limited number of external
> functions. fmod, in particular is not supported. any reason why it is not
> supported ?
> 
> "lli -force-interpreter test.bc
> LLVM ERROR: Tried to execute an unknown external function: double (double,
> double)* fmod
> "

  You can check out the comments in lib/ExecutionEngine/Interpreter/ExternalFunctions.cpp
to see how LLVM interpreter handle external functions.

  "... If such a wrapper does not exist, and libffi is available, then the Interpreter will
   attempt to invoke the function using libffi, after finding its address." 

I guess you have to configure LLVM with "--enable-libffi" option.

  HTH.

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