/// specified register (it may be live-in).
bool def_empty(unsigned RegNo) const { return def_begin(RegNo) == def_end(); }
+ /// hasOneDef - Return true if there is exactly one instruction defining the
+ /// specified register.
+ bool hasOneDef(unsigned RegNo) const {
+ def_iterator DI = def_begin(RegNo);
+ if (DI == def_end())
+ return false;
+ return ++DI == def_end();
+ }
+
/// use_iterator/use_begin/use_end - Walk all uses of the specified register.
typedef defusechain_iterator<true,false,false> use_iterator;
use_iterator use_begin(unsigned RegNo) const {