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The following page has been changed by MartinSebor: http://wiki.apache.org/stdcxx/FloatingPoint The comment on the change is: Added a note about x86 processors. ------------------------------------------------------------------------------ ||||||||||||||||<tablestyle="background-color:cornsilk">'''IEEE 754 double precision bit patterns'''|| ||<rowstyle="background-color:lightgray;text-align:center">|| Number || Sign || Exponent || Fraction || - ||<rowspan="3"> AIX/Power || Infinity || `0` || `0x7ff` || `0` || + ||<rowspan="3"> AIX/Power || Infinity || `0` || `0x7ff` || `0` || - || Quiet NaN || `0` || `0x7ff` || `0x80000` || + || Quiet NaN || `0` || `0x7ff` || `0x80000` || - || Signaling NaN || `0` || `0x7ff` || `0x5555555500055555` || + || Signaling NaN || `0` || `0x7ff` || `0x5555555500055555` || - ||<rowspan="3"> HP-UX || Infinity || `0` || `0x7ff` || `0` || + ||<rowspan="3"> HP-UX || Infinity || `0` || `0x7ff` || `0` || - || Quiet NaN || `0` || `0x7ff` || `0x40000` || + || Quiet NaN || `0` || `0x7ff` || `0x40000` || - || Signaling NaN || `0` || `0x7ff` || `0x80000` || + || Signaling NaN || `0` || `0x7ff` || `0x80000` || - ||<rowspan="3"> IRIX/MIPS || Infinity || || || || + ||<rowspan="3"> IRIX/MIPS || Infinity || || || || - || Quiet NaN || || || || + || Quiet NaN || || || || - || Signaling NaN || || || || + || Signaling NaN || || || || - ||<rowspan="3"> Linux/x86 || Infinity || `0` || `0x7ff` || `0` || + ||<rowspan="3"> Linux/x86 || Infinity || `0` || `0x7ff` || `0` || - || Quiet NaN || `0` || `0x7ff` || `0x80000` || + || Quiet NaN^1^ || `0` || `0x7ff` || `0x80000` || - || Signaling NaN || `0` || `0x7ff` || `0x40000` || + || Signaling NaN^1^|| `0` || `0x7ff` || `0x40000` || - ||<rowspan="3"> Tru64 UNIX/Alpha || Infinity || `0` || `0` || `0x7ff0000000000000` || - || Quiet NaN || `0` || `0` || `0xfff8000000000000` || - || Signaling NaN || `1` || `0x2aa` || `0x7ff5555500055555` || - ||<rowspan="3"> Windows/x86 || Infinity || || || || + ||<rowspan="3"> Solaris/SPARC || Infinity || || || || - || Quiet NaN || || || || + || Quiet NaN || || || || - || Signaling NaN || || || || + || Signaling NaN || || || || + ||<rowspan="3"> Solaris/x86 || Infinity || || || || + || Quiet NaN^1^ || || || || + || Signaling NaN^1^|| || || || + ||<rowspan="3"> Tru64 UNIX/Alpha || Infinity || `0` || `0` || `0x7ff0000000000000` || + || Quiet NaN || `0` || `0` || `0xfff8000000000000` || + || Signaling NaN || `1` || `0x2aa` || `0x7ff5555500055555` || + ||<rowspan="3"> Windows/x86 || Infinity || || || || + || Quiet NaN || || || || + || Signaling NaN || || || || + ^1^ Intel and AMD processors set the first fraction bit to 1 for Quiet NaNs and clear it for Signaling NaNs. +
