Enables control of floating-point significand precision.
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IA-32, Intel® EM64T
| Linux and Mac OS: | -pcn |
| Windows: | /Qpcn |
| n | Is the floating-point significand precision. Possible values are: | |
| 32 | Rounds the significand to 24 bits (single precision). | |
| 64 | Rounds the significand to 53 bits (double precision). | |
| 80 | Rounds the significand to 64 bits (extended precision). | |
|
-pc80 or |
On Linux* and Mac OS* systems, the floating-point significand is rounded to 64 bits. On Windows* systems, the floating-point significand is rounded to 53 bits. |
This option enables control of floating-point significand precision.
Some floating-point algorithms are sensitive to the accuracy of the significand, or fractional part of the floating-point value. For example, iterative operations like division and finding the square root can run faster if you lower the precision with the this option.
Note that a change of the default precision control or rounding mode, for example, by using the -pc32 (Linux and Mac OS) or /Qpc32 (Windows) option or by user intervention, may affect the results returned by some of the mathematical functions.
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