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The
optimize
pragma must appear outside a function. It takes effect at the first function defined after the pragma is seen. The
on
and
off
arguments turn options specified in the
optimization-list
on or off.
The
optimization-list
can be zero or more of the parameters shown in the following table.
Parameters of the optimize Pragma
Parameter(s)
Type of optimization
Enable global optimizations. Deprecated. For more information, see
/Og
(Global optimizations)
.
s
or
t
Specify short or fast sequences of machine code.
Generate frame pointers on the program stack.
These parameters are the same letters used with the
/O
compiler options. For example, the following pragma is equivalent to the
/Os
compiler option:
#pragma optimize( "s", on )
Using the optimize pragma with the empty string ("") is a special form of the directive:
When you use the off parameter, it turns all the optimizations, g, s, t, and y, off.
When you use the on parameter, it resets the optimizations to the ones that you specified using the /O compiler option.
#pragma optimize( "", off )
/* unoptimized code section */
#pragma optimize( "", on )
See also
Pragma directives and the __pragma and _Pragma keywords
