pc, Qpc
Enables control of floating-point
significand precision.
Syntax
Linux:
-pc
n
Windows:
/Qpc
n
Arguments
- 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).
Default
- -pc80or/Qpc64
- On Linux* systems, the floating-point significand is rounded to 64 bits.On Windows* systems, the floating-point significand is rounded to 53 bits.
Description
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 this option.
Note that a change of the default precision control or
rounding mode, for example, by using the
[Q]pc32
option or by user
intervention, may affect the results returned by some of the mathematical
functions.
IDE Equivalent
None
Alternate Options
None