+ /// Register usage / availability tracking helpers.
+ ///
+
+ void initRegUses() {
+ regUse_.resize(tri_->getNumRegs(), 0);
+ regUseBackUp_.resize(tri_->getNumRegs(), 0);
+ }
+
+ void finalizeRegUses() {
+#ifndef NDEBUG
+ // Verify all the registers are "freed".
+ bool Error = false;
+ for (unsigned i = 0, e = tri_->getNumRegs(); i != e; ++i) {
+ if (regUse_[i] != 0) {
+ dbgs() << tri_->getName(i) << " is still in use!\n";
+ Error = true;
+ }
+ }
+ if (Error)
+ llvm_unreachable(0);
+#endif
+ regUse_.clear();
+ regUseBackUp_.clear();
+ }
+
+ void addRegUse(unsigned physReg) {
+ assert(TargetRegisterInfo::isPhysicalRegister(physReg) &&
+ "should be physical register!");
+ ++regUse_[physReg];
+ for (const unsigned* as = tri_->getAliasSet(physReg); *as; ++as)
+ ++regUse_[*as];
+ }
+
+ void delRegUse(unsigned physReg) {
+ assert(TargetRegisterInfo::isPhysicalRegister(physReg) &&
+ "should be physical register!");
+ assert(regUse_[physReg] != 0);
+ --regUse_[physReg];
+ for (const unsigned* as = tri_->getAliasSet(physReg); *as; ++as) {
+ assert(regUse_[*as] != 0);
+ --regUse_[*as];
+ }
+ }
+
+ bool isRegAvail(unsigned physReg) const {
+ assert(TargetRegisterInfo::isPhysicalRegister(physReg) &&
+ "should be physical register!");
+ return regUse_[physReg] == 0;
+ }
+
+ void backUpRegUses() {
+ regUseBackUp_ = regUse_;
+ }
+
+ void restoreRegUses() {
+ regUse_ = regUseBackUp_;
+ }
+
+ ///
+ /// Register handling helpers.