From 07c2b7ff685523458f92339facfd814689e55873 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Sat, 4 Sep 2010 21:09:33 +0000
Subject: Remove dead code.

Clobber ranges are no longer used when joining physical registers.
Instead, all aliases are checked for interference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113084 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/LiveInterval.cpp | 97 --------------------------------------------
 1 file changed, 97 deletions(-)

(limited to 'lib/CodeGen/LiveInterval.cpp')

diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 59f380ad26..21b0bc0019 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -616,103 +616,6 @@ void LiveInterval::MergeValueInAsValue(
 }
 
 
-/// MergeInClobberRanges - For any live ranges that are not defined in the
-/// current interval, but are defined in the Clobbers interval, mark them
-/// used with an unknown definition value.
-void LiveInterval::MergeInClobberRanges(LiveIntervals &li_,
-                                        const LiveInterval &Clobbers,
-                                        VNInfo::Allocator &VNInfoAllocator) {
-  if (Clobbers.empty()) return;
-
-  DenseMap<VNInfo*, VNInfo*> ValNoMaps;
-  VNInfo *UnusedValNo = 0;
-  iterator IP = begin();
-  for (const_iterator I = Clobbers.begin(), E = Clobbers.end(); I != E; ++I) {
-    // For every val# in the Clobbers interval, create a new "unknown" val#.
-    VNInfo *ClobberValNo = 0;
-    DenseMap<VNInfo*, VNInfo*>::iterator VI = ValNoMaps.find(I->valno);
-    if (VI != ValNoMaps.end())
-      ClobberValNo = VI->second;
-    else if (UnusedValNo)
-      ClobberValNo = UnusedValNo;
-    else {
-      UnusedValNo = ClobberValNo =
-        getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator);
-      ValNoMaps.insert(std::make_pair(I->valno, ClobberValNo));
-    }
-
-    bool Done = false;
-    SlotIndex Start = I->start, End = I->end;
-    // If a clobber range starts before an existing range and ends after
-    // it, the clobber range will need to be split into multiple ranges.
-    // Loop until the entire clobber range is handled.
-    while (!Done) {
-      Done = true;
-      IP = std::upper_bound(IP, end(), Start);
-      SlotIndex SubRangeStart = Start;
-      SlotIndex SubRangeEnd = End;
-
-      // If the start of this range overlaps with an existing liverange, trim it.
-      if (IP != begin() && IP[-1].end > SubRangeStart) {
-        SubRangeStart = IP[-1].end;
-        // Trimmed away the whole range?
-        if (SubRangeStart >= SubRangeEnd) continue;
-      }
-      // If the end of this range overlaps with an existing liverange, trim it.
-      if (IP != end() && SubRangeEnd > IP->start) {
-        // If the clobber live range extends beyond the existing live range,
-        // it'll need at least another live range, so set the flag to keep
-        // iterating.
-        if (SubRangeEnd > IP->end) {
-          Start = IP->end;
-          Done = false;
-        }
-        SubRangeEnd = IP->start;
-        // If this trimmed away the whole range, ignore it.
-        if (SubRangeStart == SubRangeEnd) continue;
-      }
-
-      // Insert the clobber interval.
-      IP = addRangeFrom(LiveRange(SubRangeStart, SubRangeEnd, ClobberValNo),
-                        IP);
-      UnusedValNo = 0;
-    }
-  }
-
-  if (UnusedValNo) {
-    // Delete the last unused val#.
-    valnos.pop_back();
-  }
-}
-
-void LiveInterval::MergeInClobberRange(LiveIntervals &li_,
-                                       SlotIndex Start,
-                                       SlotIndex End,
-                                       VNInfo::Allocator &VNInfoAllocator) {
-  // Find a value # to use for the clobber ranges.  If there is already a value#
-  // for unknown values, use it.
-  VNInfo *ClobberValNo =
-    getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator);
-
-  iterator IP = begin();
-  IP = std::upper_bound(IP, end(), Start);
-
-  // If the start of this range overlaps with an existing liverange, trim it.
-  if (IP != begin() && IP[-1].end > Start) {
-    Start = IP[-1].end;
-    // Trimmed away the whole range?
-    if (Start >= End) return;
-  }
-  // If the end of this range overlaps with an existing liverange, trim it.
-  if (IP != end() && End > IP->start) {
-    End = IP->start;
-    // If this trimmed away the whole range, ignore it.
-    if (Start == End) return;
-  }
-
-  // Insert the clobber interval.
-  addRangeFrom(LiveRange(Start, End, ClobberValNo), IP);
-}
 
 /// MergeValueNumberInto - This method is called when two value nubmers
 /// are found to be equivalent.  This eliminates V1, replacing all
-- 
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