dofg <dofg@xxxxx> writes: > you gave the description of the constraints > : "=&r" ((USItype)(r1)), > "=&r" ((USItype)(r0)) > : "%rJ" ((USItype)(x3)), > "rI" ((USItype)(y3)), > i am pointing to > "subx %r2,%3,%%g1\n\t" > more definitely, to %r2. operand of subx. 'r' here is also a > constraint, telling compiler to use register? Oh, sorry. That's not a constraint. That's an operand modifier. For SPARC %r2 means that if the argument is the integer zero, it should print %g0. Otherwise it should print the operand as usual. Ian
