Inline Assembly: Difference between revisions

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| tells the value '0x21' can be used as a constant in the out or in operation if ranging from 0 to 255
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There are of course more machine-dependent constraints you can put on the operand selection, which are listed in theGCC's infomanual page(see of[http://gcc.gnu.org/onlinedocs/gcc-4.4.4/gcc/Simple-Constraints.html#Simple-Constraints], GCC[http://gcc.gnu.org/onlinedocs/gcc-4.4.4/gcc/Modifiers.html#Modifiers], [http://gcc.gnu.org/onlinedocs/gcc-4.4.4/gcc/Multi_002dAlternative.html#Multi_002dAlternative], and [http://gcc.gnu.org/onlinedocs/gcc-4.4.4/gcc/Machine-Constraints.html#Machine-Constraints]).
 
==Using C99==
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