__optlevelx

Optimization level exported as a predefined macro.

Syntax

  __optlevel0

  __optlevel1

  __optlevel2

  __optlevel3

  __optlevel4

Remarks

Using these macros, user can conditionally compile code for a particular optimization level. The following table lists the level of optimization provided by the __optlevelx macro.

Table 1. Optimization Levels
Macro	Optimization Level
__optlevel0	O0
__optlevel1	O1
__optlevel2	O2
__optlevel3	O3
__optlevel4	O4

Example

The listing below shows an example of __optlevelx macro usage.

Listing: Example usage of __optlevel macro

int main()

{

#if __optlevel0

... // This code compiles only if this code compiled with Optimization

level 0

#elif __optlevel1

... // This code compiles only if this code compiled with Optimization

level 1

#elif __optlevel2

... // This code compiles only if this code compiled with Optimization

level 2

#elif __optlevel3

... // This code compiles only if this code compiled with Optimization

level 3

#elif __optlevel4

... // This code compiles only if this code compiled with Optimization

level 4

#endif

}