.bss symbol, length, align.lcomm only in that it permits you to specify
an alignment. See .lcomm.
.extended flonums.extended expects zero or more flonums, separated by commas; for
each flonum, .extended emits an IEEE extended-format (80-bit)
floating-point number.
.leafproc call-lab, bal-lab.leafproc directive in conjunction with the
optimized callj instruction to enable faster calls of leaf
procedures. If a procedure is known to call no other procedures, you
may define an entry point that skips procedure prolog code (and that does
not depend on system-supplied saved context), and declare it as the
bal-lab using .leafproc. If the procedure also has an
entry point that goes through the normal prolog, you can specify that
entry point as call-lab.
A .leafproc declaration is meant for use in conjunction with the
optimized call instruction callj; the directive records the data
needed later to choose between converting the callj into a
bal or a call.
call-lab is optional; if only one argument is present, or if the
two arguments are identical, the single argument is assumed to be the
bal entry point.
.sysproc name, index.sysproc directive defines a name for a system procedure.
After you define it using .sysproc, you can use name to
refer to the system procedure identified by index when calling
procedures with the optimized call instruction callj.
Both arguments are required; index must be between 0 and 31 (inclusive).