while looking thru some 360 assembler code one day, I came across this ... XC loc1,loc2 XC loc2,loc1 XC loc1,loc2 It took a day of head scratching, and vari

while looking thru some 360 assembler code one day, I came across this ... XC loc1,loc2 XC loc2,loc1 XC loc1,loc2 It took a day of head scratching, and various notes, before I understood that it was a clever way of exchanging the contents of two storage locations, without a third intermediate location. Three consecutive exclusive-Ors.