Ian Lance Taylor <iant@xxxxxxxxxx> wrote: > 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. huge thanks. i'm curious of other operand modifiers. can you advice any docs on them? > > Ian mp
