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Arm Compiler armasm User Guide : ROUT


The ROUT directive marks the boundaries of the scope of numeric local labels.


{name} ROUT



is the name to be assigned to the scope.


Use the ROUT directive to limit the scope of numeric local labels. This makes it easier for you to avoid referring to a wrong label by accident. The scope of numeric local labels is the whole area if there are no ROUT directives in it.

Use the name option to ensure that each reference is to the correct numeric local label. If the name of a label or a reference to a label does not match the preceding ROUT directive, the assembler generates an error message and the assembly fails.


            ; code
routineA    ROUT            ; ROUT is not necessarily a routine
            ; code
3routineA   ; code          ; this label is checked
            ; code
            BEQ     %4routineA   ; this reference is checked
            ; code
            BGE     %3      ; refers to 3 above, but not checked
            ; code
4routineA   ; code          ; this label is checked
            ; code
otherstuff  ROUT            ; start of next scope