Defines the maximum allowable absolute error for math library function results.
IDE Equivalent
NoneArchitectures
IA-32, Intel® 64 architectures
Syntax
Linux and Mac OS X: | -fimf-absolute-error=value[:funclist] |
Windows: | /Qimf-absolute-error:value[:funclist] |
Arguments
value |
Is a positive, floating-point number indicating the maximum allowable absolute error the compiler should use. The format for the number is [digits] [.digits] [ { e | E }[sign]digits] |
funclist |
Is an optional list of one or more math library functions to which the attribute should be applied. If you specify more than one function, they must be separated with commas. |
Default
0 (zero) |
The compiler uses default heuristics when calling math library functions. An absolute-error setting of 0 means that the function is bound by the relative error setting. This is the default behavior. |
Description
This option defines the maximum allowable absolute error for math library function results.
This option can improve run-time performance, but it may decrease the accuracy of results.
This option only affects functions that have zero as a possible return value, such as log, sin, asin, etc.
The relative error requirements for a particular function are determined by options that set max-error and precision. The return value from a function must have a relative error less than the max-error value, or an absolute error less than the absolute-error value.
Note
Many routines in libraries libm (Math Library) and svml (Short Vector Math Library) are more highly optimized for Intel® microprocessors than for non-Intel microprocessors.
Alternate Options
None