// LiveIn management methods.
- /// addLiveIn - Add the specified register as a live in. Note that it
- /// is an error to add the same register to the same set more than once.
- void addLiveIn(unsigned Reg) { LiveIns.push_back(Reg); }
+ /// Adds the specified register as a live in. Note that it is an error to add
+ /// the same register to the same set more than once unless the intention is
+ /// to call sortUniqueLiveIns after all registers are added.
+ void addLiveIn(unsigned Reg) { LiveIns.push_back(Reg); }
+
+ /// Sorts and uniques the LiveIns vector. It can be significantly faster to do
+ /// this than repeatedly calling isLiveIn before calling addLiveIn for every
+ /// LiveIn insertion.
+ void sortUniqueLiveIns() {
+ std::sort(LiveIns.begin(), LiveIns.end());
+ LiveIns.erase(std::unique(LiveIns.begin(), LiveIns.end()), LiveIns.end());
+ }
/// Add PhysReg as live in to this block, and ensure that there is a copy of
/// PhysReg to a virtual register of class RC. Return the virtual register