------- Comment #13 from dannysmith at users dot sourceforge dot net 2006-09-11 19:47 ------- In my sources for David Gay's gdtoa implemntation it say this: /* On a machine with IEEE extended-precision registers, it is * necessary to specify double-precision (53-bit) rounding precision * before invoking strtod or dtoa. If the machine uses (the equivalent * of) Intel 80x87 arithmetic, the call * _control87(PC_53, MCW_PC); * does this with many compilers. Whether this or another call is * appropriate depends on the compiler; for this to work, it may be * necessary to #include "float.h" or another system-dependent header * file. */
There is a variant of strtod in the gdtoa file strtodnrp.c: /* This is a variant of strtod that works on Intel ia32 systems */ /* with the default extended-precision arithmetic -- it does not */ /* require setting the precision control to 53 bits. */ -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28096
