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The following page has been changed by MartinSebor:
http://wiki.apache.org/stdcxx/FloatingPoint
The comment on the change is:
Formatted bit patterns in a table.
------------------------------------------------------------------------------
||<(>`signaling_NaN()`|| `-INF` || `nan` || `nan0xxx` || `nan` || `NaN`
|| 0 || `1.#QNAN` || `1.#SNAN` ||
+ == Bit Patterns ==
- AIX/Power:
- INF: INF: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0
- QNAN: NaNQ: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x80000
- SNAN: NaNS: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x5555555500055555
+ The table below shows the bit patterns for Infinity, Quiet NaN, and Signaling NaN on each
platform.
- HP-UX/IPF:
- INF: inf: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0
- QNAN: nan: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x40000
- SNAN: nan: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x80000
- HP-UX/PA
- INF: inf: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0
- QNAN: nan: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x40000
- SNAN: nan: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x80000
+ ||||||||||||||||<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`
||
+ || Quiet NaN || `0` || `0x7ff` || `0x80000`
||
+ || Signaling NaN || `0` || `0x7ff` || `0x5555555500055555`
||
+ ||<rowspan="3"> HP-UX || Infinity || `0` || `0x7ff` || `0`
||
+ || Quiet NaN || `0` || `0x7ff` || `0x40000`
||
+ || Signaling NaN || `0` || `0x7ff` || `0x80000`
||
+ ||<rowspan="3"> IRIX/MIPS || Infinity || || ||
||
+ || Quiet NaN || || ||
||
+ || Signaling NaN || || ||
||
+ ||<rowspan="3"> Linux/x86 || Infinity || `0` || `0x7ff` || `0`
||
+ || Quiet NaN || `0` || `0x7ff` || `0x80000`
||
+ || Signaling NaN || `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 || || ||
||
+ || Quiet NaN || || ||
||
+ || Signaling NaN || || ||
||
- Linux/x86_64
- INF: inf: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0
- QNAN: nan: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x80000
- SNAN: nan: signbit = 0
- sign = 0, exponent = 0x7ff, fraction = 0x40000
-
- Tru64 UNIX
- INF: INF: signbit = 0
- sign = 0, exponent = 0, fraction = 0x7ff0000000000000
- QNAN: NaNQ: signbit = 0x1
- sign = 0, exponent = 0, fraction = 0xfff8000000000000
- SNAN: NaNS: signbit = 0
- sign = 0x1, exponent = 0x2aa, fraction = 0x7ff5555500055555
-
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