AN3350 datasheet(125/185 Pages) STMICROELECTRONICS

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AN3350

Using pragmas

Doc ID 018512 Rev 2

125/185

cannot be saved in one source code file then restored in another unless both source code

files are included in the same compilation unit.

Pragmas push and pop save and restore, respectively, most pragma settings in a

compilation unit. Pragmas push and pop may be nested to unlimited depth.Example 75

shows an example.

Example 75 Using push and pop to save and restore pragma settings

/* Settings for this file. */

#pragma opt_unroll_loops on

#pragma optimize_for_size off

void fast_func_A(void)

{

/* ... */

}

/* Settings for slow_func(). */

#pragma push /* Save file settings. */

#pragma optimization_size 0

void slow_func(void)

{

/* ... */

}

#pragma pop /* Restore file settings. */

void fast_func_B(void)

{

/* ... */

}

Pragmas that accept the reset argument perform the same actions as pragmas push and

pop

, but apply to a single pragma. A pragma’s on and off arguments save the pragma’s

current setting before changing it to the new setting. A pragma’s reset argument restores

the pragma’s setting. The on, off, and reset arguments may be nested to an unlimited

depth.Example 76 shows an example.

Example 76 Using the reset option to save and restore a pragma setting

/* Setting for this file. */

#pragma opt_unroll_loops on

void fast_func_A(void)

{

/* ... */

}

/* Setting for smallslowfunc(). */

#pragma opt_unroll_loops off

void small_func(void)

{

/* ... */

}

/* Restore previous setting. */

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