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.sizeThis directive is used to set the size associated with a symbol.
For COFF targets, the .size directive is only permitted inside
.def/.endef pairs. It is used like this:
.size expression
For ELF targets, the .size directive is used like this:
.size name , expression
This directive sets the size associated with a symbol name. The size in bytes is computed from expression which can make use of label arithmetic. This directive is typically used to set the size of function symbols.