mp <dofg@xxxxx> writes: > Ian Lance Taylor <iant@.com> wrote: > > Mihail Platonov <dofg@.ru> writes: > > > > > what is the semantics of "r" specifier in subx operand (%r2)? > > > and what is the meaning of connection between this specifier and "J" > > > constraint? > > > __asm__ __volatile__ ( > > > ... > > > "subx %r2,%3,%%g1\n\t" > > > : "=&r" ((USItype)(r1)), > > > "=&r" ((USItype)(r0)) > > > : "%rJ" ((USItype)(x3)), > > > "rI" ((USItype)(y3)), > > > ... > > > > The 'r' constraint means that that operand must be a general register. > > The 'J' constraint means that it must be the integer zero. Using both > > rJ and together means that the operand must be either a general > > register or the integer zero. > thanx for answer anyway, but it is the description of constraints. > i'm trying to find out info about ... > subx op1, op2, op3 > ... about op1. why 'r' is there and so on. That is the question I tried to answer. So I don't know what you are asking. What type of answer are you looking for? Ian
