On 13 June 2011 11:24, Jan Chludzinski wrote: > Just finished compiling some numerical code (developed using the > Borland C++ compiler) using G++ 4.3.4 (that came with Cygwin 1.7). The > answers are different from what I get using the Borland compiler > (circa 2002). I have known correct answers from some NASA code and > compare against those. > > I've transitioned of late to Code::Blocks using the latest MinGW. > MinGW comes with G++ 4.5.2. I compiled using this compiler and it > once again works (I get the same answers as the NASA code). > > Are there known problems with G++ 4.3.4? > > BTW, the original code was infinite looping until I replaced the old style: > > for (i=0; i<WHATEVER; i++) .. > > with i declared within the routine (i.e., function) with: > > for (int i=0; i<WHATEVER; i++) ... Are you using x86? Are you telling the compiler to use SSE registers for floating point instead of the 387 registers? Does using "-march=pentium3 -mfpmath=sse" with GCC 4.3.4 give the expected results?
