RegisterString BB::compute_usedTwice() {
fint len = duInfo.info->length();
RegisterString used = 0;
RegisterString usedTwice = 0;
fint i;
for (i = 0; i < len; i++) {
PReg* r = duInfo.info->nth(i)->reg;
if (r->loc != UnAllocated && isAllocated(used, r->loc)) {
// two PRegs have same preallocated reg - algorithm below can't handle
// this
usedTwice = allocateRegister(usedTwice, r->loc);
}
used = allocateRegister(used, r->loc);
}
return usedTwice;
}
/**
* Allocate a free integer register.
*
* @return the register that has been allocated
*/
int allocateIntegerRegister() {
return allocateRegister(allocatedIntegerRegisters,NUM_INTEGER_REGISTERS);
}
