5D. assembly mnemonics
In E, inline assembly is a true part of the language, they need not
be enclosed in special "ASM" blocks or the like, as is usual in
other languages, nor are separate assemblers necessary to assemble
the code. This also means that it obeys the E syntax rules, etc.
(see  15A  to read all about the inline assembler). Example:

DEF a,b
MOVEQ  #1,D0             /* just use some assembly statements */
MOVE.L D0,a              /* a:=1+b  */
ADD.L  b,a
WriteF('a=\d\n',a)       /* a will be 3 */