On Wed, 2006-08-30 at 14:58 -0400, David Roundy wrote:
It's sad, but we're stuck with it, as I'm not aware of any compiler that is capable of generating IEEE arithmetic.
Gcc man page: -ffast-math Sets -fno-math-errno, -funsafe-math-optimizations, -fno-trap‐ ping-math, -ffinite-math-only, -fno-rounding-math, -fno-signal‐ ing-nans and fcx-limited-range. This option causes the preprocessor macro "__FAST_MATH__" to be defined. This option should never be turned on by any -O option since it can result in incorrect output for programs which depend on an exact implementation of IEEE or ISO rules/specifications for math func‐ tions. Exact portable calculations are the default: you have to enable non-IEEE/ISO C conformance to get good performance explicitly with a switch. -- John Skaller <skaller at users dot sf dot net> Felix, successor to C++: http://felix.sf.net