"Jacob Schwartz" <[EMAIL PROTECTED]> writes: > A test on IEEE computers (x86 and x86-64), shows that for > a range of 64-bit "double" values, the answers in C do differ (in the > last bit) if you use "log2(x)" and "log10(x)" versus "log (x) / > log(2)" and "log(x) / log(10)".
I think this may also depend on C compiler and optimization level. Perhaps now everybody uses SSE to do math, but earlier Intel FPU architectures did floating point with 80-bit registers, so the accuracy of the result could depend on whether an intermediate result was flushed to memory (by a context switch). Equality on floating point is tricky, if I were you, I'd round the results before comparing. -k -- If I haven't seen further, it is by standing in the footprints of giants _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
