From 1803b37bad85cca19a15c0040979719240f48626 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Fri, 24 Sep 2010 23:58:56 +0000
Subject: [PATCH] Terminator gaps were unused. Might as well delete them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114776 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/LiveIntervalAnalysis.h |  4 ----
 include/llvm/CodeGen/SlotIndexes.h          | 17 -----------------
 lib/CodeGen/SlotIndexes.cpp                 | 17 +----------------
 3 files changed, 1 insertion(+), 37 deletions(-)

diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index 2918c3c2abe..2075fe1d57c 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -227,10 +227,6 @@ namespace llvm {
       return indexes_->getMBBFromIndex(index);
     }
 
-    SlotIndex getMBBTerminatorGap(const MachineBasicBlock *mbb) {
-      return indexes_->getTerminatorGap(mbb);
-    }
-
     SlotIndex InsertMachineInstrInMaps(MachineInstr *MI) {
       return indexes_->insertMachineInstrInMaps(MI);
     }
diff --git a/include/llvm/CodeGen/SlotIndexes.h b/include/llvm/CodeGen/SlotIndexes.h
index 88044c7242c..e069f896aee 100644
--- a/include/llvm/CodeGen/SlotIndexes.h
+++ b/include/llvm/CodeGen/SlotIndexes.h
@@ -405,9 +405,6 @@ namespace llvm {
     /// and MBB id.
     std::vector<IdxMBBPair> idx2MBBMap;
 
-    typedef DenseMap<const MachineBasicBlock*, SlotIndex> TerminatorGapsMap;
-    TerminatorGapsMap terminatorGaps;
-
     // IndexListEntry allocator.
     BumpPtrAllocator ileAllocator;
 
@@ -579,14 +576,6 @@ namespace llvm {
       return itr->second.second;
     }
 
-    /// Returns the terminator gap for the given index.
-    SlotIndex getTerminatorGap(const MachineBasicBlock *mbb) {
-      TerminatorGapsMap::iterator itr = terminatorGaps.find(mbb);
-      assert(itr != terminatorGaps.end() &&
-             "All MBBs should have terminator gaps in their indexes.");
-      return itr->second;
-    }
-
     /// Returns the basic block which the given index falls in.
     MachineBasicBlock* getMBBFromIndex(SlotIndex index) const {
       std::vector<IdxMBBPair>::const_iterator I =
@@ -789,7 +778,6 @@ namespace llvm {
       MachineFunction::iterator nextMBB =
         llvm::next(MachineFunction::iterator(mbb));
       IndexListEntry *startEntry = createEntry(0, 0);
-      IndexListEntry *terminatorEntry = createEntry(0, 0); 
       IndexListEntry *nextEntry = 0;
 
       if (nextMBB == mbb->getParent()->end()) {
@@ -799,15 +787,10 @@ namespace llvm {
       }
 
       insert(nextEntry, startEntry);
-      insert(nextEntry, terminatorEntry);
 
       SlotIndex startIdx(startEntry, SlotIndex::LOAD);
-      SlotIndex terminatorIdx(terminatorEntry, SlotIndex::PHI_BIT);
       SlotIndex endIdx(nextEntry, SlotIndex::LOAD);
 
-      terminatorGaps.insert(
-        std::make_pair(mbb, terminatorIdx));
-
       mbb2IdxMap.insert(
         std::make_pair(mbb, std::make_pair(startIdx, endIdx)));
 
diff --git a/lib/CodeGen/SlotIndexes.cpp b/lib/CodeGen/SlotIndexes.cpp
index 1bc148f160b..4d362d55a4c 100644
--- a/lib/CodeGen/SlotIndexes.cpp
+++ b/lib/CodeGen/SlotIndexes.cpp
@@ -61,7 +61,6 @@ void SlotIndexes::releaseMemory() {
   mi2iMap.clear();
   mbb2IdxMap.clear();
   idx2MBBMap.clear();
-  terminatorGaps.clear();
   clearList();
 }
 
@@ -112,13 +111,6 @@ bool SlotIndexes::runOnMachineFunction(MachineFunction &fn) {
       if (mi->isDebugValue())
         continue;
 
-      if (miItr == mbb->getFirstTerminator()) {
-        push_back(createEntry(0, index));
-        terminatorGaps.insert(
-          std::make_pair(mbb, SlotIndex(back(), SlotIndex::PHI_BIT)));
-        index += SlotIndex::NUM;
-      }
-
       // Insert a store index for the instr.
       push_back(createEntry(mi, index));
 
@@ -135,13 +127,6 @@ bool SlotIndexes::runOnMachineFunction(MachineFunction &fn) {
       index += (Slots + 1) * SlotIndex::NUM;
     }
 
-    if (mbb->getFirstTerminator() == mbb->end()) {
-      push_back(createEntry(0, index));
-      terminatorGaps.insert(
-        std::make_pair(mbb, SlotIndex(back(), SlotIndex::PHI_BIT)));
-      index += SlotIndex::NUM;
-    }
-
     // One blank instruction at the end.
     push_back(createEntry(0, index));    
 
@@ -179,7 +164,7 @@ void SlotIndexes::renumberIndexes() {
     curEntry->setIndex(index);
 
     if (curEntry->getInstr() == 0) {
-      // MBB start entry or terminator gap. Just step index by 1.
+      // MBB start entry. Just step index by 1.
       index += SlotIndex::NUM;
     }
     else {