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#pragma GCC target ("string"...)
This pragma allows you to set target specific options for functions
defined later in the source file. One or more strings can be
specified. Each function that is defined after this point is as
if attribute((target("STRING")))
was specified for that
function. The parenthesis around the options is optional.
See Function Attributes, for more information about the
target
attribute and the attribute syntax.
The #pragma GCC target
attribute is not implemented in GCC versions earlier
than 4.4 for the i386/x86_64 and 4.6 for the PowerPC back ends. At
present, it is not implemented for other back ends.
#pragma GCC optimize ("string"...)
This pragma allows you to set global optimization options for functions
defined later in the source file. One or more strings can be
specified. Each function that is defined after this point is as
if attribute((optimize("STRING")))
was specified for that
function. The parenthesis around the options is optional.
See Function Attributes, for more information about the
optimize
attribute and the attribute syntax.
The ‘#pragma GCC optimize’ pragma is not implemented in GCC versions earlier than 4.4.
#pragma GCC push_options
#pragma GCC pop_options
These pragmas maintain a stack of the current target and optimization options. It is intended for include files where you temporarily want to switch to using a different ‘#pragma GCC target’ or ‘#pragma GCC optimize’ and then to pop back to the previous options.
The ‘#pragma GCC push_options’ and ‘#pragma GCC pop_options’ pragmas are not implemented in GCC versions earlier than 4.4.
#pragma GCC reset_options
This pragma clears the current #pragma GCC target
and
#pragma GCC optimize
to use the default switches as specified
on the command line.
The ‘#pragma GCC reset_options’ pragma is not implemented in GCC versions earlier than 4.4.
Previous: Push/Pop Macro Pragmas, Up: Pragmas [Contents][Index]