Revert r135121 which broke a gcc-4.2 builder.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135122 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 14 deletions

diff --git a/lib/CodeGen/InterferenceCache.cpp b/lib/CodeGen/InterferenceCache.cpp
index a09bb39f83..b1014a97fa 100644
--- a/lib/CodeGen/InterferenceCache.cpp
+++ b/lib/CodeGen/InterferenceCache.cpp
@@ -14,7 +14,6 @@
 #define DEBUG_TYPE "regalloc"
 #include "InterferenceCache.h"
 #include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/Support/ErrorHandling.h"
 
 using namespace llvm;
 
@@ -41,18 +40,9 @@ InterferenceCache::Entry *InterferenceCache::get(unsigned PhysReg) {
   E = RoundRobin;
   if (++RoundRobin == CacheEntries)
     RoundRobin = 0;
-  for (unsigned i = 0; i != CacheEntries; ++i) {
-    // Skip entries that are in use.
-    if (Entries[E].hasRefs()) {
-      if (++E == CacheEntries)
-        E = 0;
-      continue;
-    }
-    Entries[E].reset(PhysReg, LIUArray, TRI, MF);
-    PhysRegEntries[PhysReg] = E;
-    return &Entries[E];
-  }
-  llvm_unreachable("Ran out of interference cache entries.");
+  Entries[E].reset(PhysReg, LIUArray, TRI, MF);
+  PhysRegEntries[PhysReg] = E;
+  return &Entries[E];
 }
 
 /// revalidate - LIU contents have changed, update tags.
@@ -69,7 +59,6 @@ void InterferenceCache::Entry::reset(unsigned physReg,
                                      LiveIntervalUnion *LIUArray,
                                      const TargetRegisterInfo *TRI,
                                      const MachineFunction *MF) {
-  assert(!hasRefs() && "Cannot reset cache entry with references");
   // LIU's changed, invalidate cache.
   ++Tag;
   PhysReg = physReg;