Track new virtual registers by register number.

Track new virtual registers by register number, rather than by the live
interval created for them. This is the first step in separating the
creation of new virtual registers and new live intervals.  Eventually
live intervals will be created and populated on demand after the virtual
registers have been created and used in instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188434 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 15 insertions, 11 deletions

diff --git a/lib/CodeGen/LiveDebugVariables.cpp b/lib/CodeGen/LiveDebugVariables.cpp
index 85bed46569..1216445082 100644
--- a/lib/CodeGen/LiveDebugVariables.cpp
+++ b/lib/CodeGen/LiveDebugVariables.cpp
@@ -131,7 +131,8 @@ class UserValue {
 
   /// splitLocation - Replace OldLocNo ranges with NewRegs ranges where NewRegs
   /// is live. Returns true if any changes were made.
-  bool splitLocation(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs);
+  bool splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
+                     LiveIntervals &LIS);
 
 public:
   /// UserValue - Create a new UserValue.
@@ -251,7 +252,8 @@ public:
 
   /// splitRegister - Replace OldReg ranges with NewRegs ranges where NewRegs is
   /// live. Returns true if any changes were made.
-  bool splitRegister(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs);
+  bool splitRegister(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
+                     LiveIntervals &LIS);
 
   /// rewriteLocations - Rewrite virtual register locations according to the
   /// provided virtual register map.
@@ -345,7 +347,7 @@ public:
   void mapVirtReg(unsigned VirtReg, UserValue *EC);
 
   /// splitRegister -  Replace all references to OldReg with NewRegs.
-  void splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs);
+  void splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs);
 
   /// emitDebugValues - Recreate DBG_VALUE instruction from data structures.
   void emitDebugValues(VirtRegMap *VRM);
@@ -729,7 +731,8 @@ LiveDebugVariables::~LiveDebugVariables() {
 //===----------------------------------------------------------------------===//
 
 bool
-UserValue::splitLocation(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs) {
+UserValue::splitLocation(unsigned OldLocNo, ArrayRef<unsigned> NewRegs,
+                         LiveIntervals& LIS) {
   DEBUG({
     dbgs() << "Splitting Loc" << OldLocNo << '\t';
     print(dbgs(), 0);
@@ -738,7 +741,7 @@ UserValue::splitLocation(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs) {
   LocMap::iterator LocMapI;
   LocMapI.setMap(locInts);
   for (unsigned i = 0; i != NewRegs.size(); ++i) {
-    LiveInterval *LI = NewRegs[i];
+    LiveInterval *LI = &LIS.getInterval(NewRegs[i]);
     if (LI->empty())
       continue;
 
@@ -827,7 +830,8 @@ UserValue::splitLocation(unsigned OldLocNo, ArrayRef<LiveInterval*> NewRegs) {
 }
 
 bool
-UserValue::splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
+UserValue::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs,
+                         LiveIntervals &LIS) {
   bool DidChange = false;
   // Split locations referring to OldReg. Iterate backwards so splitLocation can
   // safely erase unused locations.
@@ -836,15 +840,15 @@ UserValue::splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
     const MachineOperand *Loc = &locations[LocNo];
     if (!Loc->isReg() || Loc->getReg() != OldReg)
       continue;
-    DidChange |= splitLocation(LocNo, NewRegs);
+    DidChange |= splitLocation(LocNo, NewRegs, LIS);
   }
   return DidChange;
 }
 
-void LDVImpl::splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
+void LDVImpl::splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs) {
   bool DidChange = false;
   for (UserValue *UV = lookupVirtReg(OldReg); UV; UV = UV->getNext())
-    DidChange |= UV->splitRegister(OldReg, NewRegs);
+    DidChange |= UV->splitRegister(OldReg, NewRegs, *LIS);
 
   if (!DidChange)
     return;
@@ -852,11 +856,11 @@ void LDVImpl::splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
   // Map all of the new virtual registers.
   UserValue *UV = lookupVirtReg(OldReg);
   for (unsigned i = 0; i != NewRegs.size(); ++i)
-    mapVirtReg(NewRegs[i]->reg, UV);
+    mapVirtReg(NewRegs[i], UV);
 }
 
 void LiveDebugVariables::
-splitRegister(unsigned OldReg, ArrayRef<LiveInterval*> NewRegs) {
+splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs, LiveIntervals &LIS) {
   if (pImpl)
     static_cast<LDVImpl*>(pImpl)->splitRegister(OldReg, NewRegs);
 }