X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FPhysRegTracker.h;h=1f10c4bdaf9ccc48bff2e527e9e9408db837b49e;hb=ae099d54428f4113f8a71c53314975fb8a8e8bbc;hp=36128c65a8806256f8fa96454721ab3bda52fe7a;hpb=888b1a6ccdd0b12a71a38c6318b9e773006d5564;p=oota-llvm.git

diff --git a/lib/CodeGen/PhysRegTracker.h b/lib/CodeGen/PhysRegTracker.h
index 36128c65a88..1f10c4bdaf9 100644
--- a/lib/CodeGen/PhysRegTracker.h
+++ b/lib/CodeGen/PhysRegTracker.h
@@ -1,74 +1,68 @@
-//===-- llvm/CodeGen/LiveInterval.h - Live Interval Analysis ----*- C++ -*-===//
+//===-- llvm/CodeGen/PhysRegTracker.h - Physical Register Tracker -*- C++ -*-=//
 //
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements a physical register tracker. The tracker
-// tracks physical register usage through addPhysRegUse and
-// delPhysRegUse functions while abstracting away register aliases.
+// tracks physical register usage through addRegUse and
+// delRegUse. isRegAvail checks if a physical register is available or
+// not taking into consideration register aliases.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_CODEGEN_PHYSREGTRACKER_H
 #define LLVM_CODEGEN_PHYSREGTRACKER_H
 
-#include "llvm/CodeGen/MachineFunction.h"
-#include <vector>
+#include "llvm/Target/TargetRegisterInfo.h"
 
 namespace llvm {
 
     class PhysRegTracker {
-    private:
-        const MRegisterInfo* mri_;
+        const TargetRegisterInfo* tri_;
         std::vector<unsigned> regUse_;
 
     public:
-        PhysRegTracker(MachineFunction* mf)
-            : mri_(mf ? mf->getTarget().getRegisterInfo() : NULL) {
-            if (mri_) {
-                regUse_.assign(mri_->getNumRegs(), 0);
-            }
+        explicit PhysRegTracker(const TargetRegisterInfo& tri)
+            : tri_(&tri),
+              regUse_(tri_->getNumRegs(), 0) {
         }
 
         PhysRegTracker(const PhysRegTracker& rhs)
-            : mri_(rhs.mri_),
+            : tri_(rhs.tri_),
               regUse_(rhs.regUse_) {
         }
 
         const PhysRegTracker& operator=(const PhysRegTracker& rhs) {
-            mri_ = rhs.mri_;
+            tri_ = rhs.tri_;
             regUse_ = rhs.regUse_;
             return *this;
         }
 
         void addRegUse(unsigned physReg) {
-            assert(MRegisterInfo::isPhysicalRegister(physReg) &&
+            assert(TargetRegisterInfo::isPhysicalRegister(physReg) &&
                    "should be physical register!");
             ++regUse_[physReg];
-            for (const unsigned* as = mri_->getAliasSet(physReg); *as; ++as) {
-                physReg = *as;
-                ++regUse_[physReg];
-            }
+            for (const unsigned* as = tri_->getAliasSet(physReg); *as; ++as)
+                ++regUse_[*as];
         }
 
         void delRegUse(unsigned physReg) {
-            assert(MRegisterInfo::isPhysicalRegister(physReg) &&
+            assert(TargetRegisterInfo::isPhysicalRegister(physReg) &&
                    "should be physical register!");
             assert(regUse_[physReg] != 0);
             --regUse_[physReg];
-            for (const unsigned* as = mri_->getAliasSet(physReg); *as; ++as) {
-                physReg = *as;
-                assert(regUse_[physReg] != 0);
-                --regUse_[physReg];
+            for (const unsigned* as = tri_->getAliasSet(physReg); *as; ++as) {
+                assert(regUse_[*as] != 0);
+                --regUse_[*as];
             }
         }
 
-        bool isPhysRegAvail(unsigned physReg) const {
-            assert(MRegisterInfo::isPhysicalRegister(physReg) &&
+        bool isRegAvail(unsigned physReg) const {
+            assert(TargetRegisterInfo::isPhysicalRegister(physReg) &&
                    "should be physical register!");
             return regUse_[physReg] == 0;
         }