Maintains floating-point precision while disabling some optimizations. This is a deprecated option.
IDE Equivalent
Windows: None
Linux: Floating Point > Improve Floating-point Consistency
Mac OS X: Floating Point > Improve Floating-point Consistency
Architectures
IA-32, Intel® 64 architectures
Syntax
Linux and Mac OS X: | -mp |
Windows: | None |
Arguments
None
Default
OFF |
The compiler provides good accuracy and run-time performance at the expense of less consistent floating-point results. |
Description
This option maintains floating-point precision while disabling some optimizations, such as -fma (Linux) and /Qfma (Windows). It restricts optimization to maintain declared precision and to ensure that floating-point arithmetic conforms more closely to the ANSI* language and IEEE* arithmetic standards.
For most programs, specifying this option adversely affects performance. If you are not sure whether your application needs this option, try compiling and running your program both with and without it to evaluate the effects on both performance and precision.
The recommended method to control the semantics of floating-point calculations is to use option -fp-model.
Note
This option may enable extra optimization that only applies to Intel® microprocessors.
Alternate Options
None