[R] Efficiency of C Compiler in "R CMD SHLIB"

[yehengxin]

Dear R experts:

I attempted to compile c source code  into DLL using "R CMD SHLIB" but I
found the DLL run in R is almost twice slower than the codes compiled in C++
6.0 when I chose "release" option and is as fast as the situation where I
chose "debug" option in C++ 6.0.  I wonder how to improve the efficiency of
DLL compiled by gcc compiler in R.  Thanks in advance!

Xin 
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