Extract SpillPlacement::addLinks for handling the special transparent blocks.

llvm-svn: 129079

1 files changed, 18 insertions, 17 deletions

diff --git a/llvm/lib/CodeGen/SpillPlacement.cpp b/llvm/lib/CodeGen/SpillPlacement.cpp
index 0ccb93f871d..ac7a19267c5 100644
--- a/llvm/lib/CodeGen/SpillPlacement.cpp
+++ b/llvm/lib/CodeGen/SpillPlacement.cpp
@@ -213,23 +213,6 @@ void SpillPlacement::addConstraints(ArrayRef<BlockConstraint> LiveBlocks) {
   for (ArrayRef<BlockConstraint>::iterator I = LiveBlocks.begin(),
        E = LiveBlocks.end(); I != E; ++I) {
     float Freq = getBlockFrequency(I->Number);
-
-    // Is this a transparent block? Link ingoing and outgoing bundles.
-    if (I->Entry == DontCare && I->Exit == DontCare) {
-      unsigned ib = bundles->getBundle(I->Number, 0);
-      unsigned ob = bundles->getBundle(I->Number, 1);
-
-      // Ignore self-loops.
-      if (ib == ob)
-        continue;
-      activate(ib);
-      activate(ob);
-      nodes[ib].addLink(ob, Freq, 1);
-      nodes[ob].addLink(ib, Freq, 0);
-      continue;
-    }
-
-    // This block is not transparent, but it can still add bias.
     const float Bias[] = {
       0,           // DontCare,
       1,           // PrefReg,
@@ -253,6 +236,24 @@ void SpillPlacement::addConstraints(ArrayRef<BlockConstraint> LiveBlocks) {
   }
 }
 
+void SpillPlacement::addLinks(ArrayRef<unsigned> Links) {
+  for (ArrayRef<unsigned>::iterator I = Links.begin(), E = Links.end(); I != E;
+       ++I) {
+    unsigned Number = *I;
+    unsigned ib = bundles->getBundle(Number, 0);
+    unsigned ob = bundles->getBundle(Number, 1);
+
+    // Ignore self-loops.
+    if (ib == ob)
+      continue;
+    activate(ib);
+    activate(ob);
+    float Freq = getBlockFrequency(Number);
+    nodes[ib].addLink(ob, Freq, 1);
+    nodes[ob].addLink(ib, Freq, 0);
+  }
+}
+
 /// iterate - Repeatedly update the Hopfield nodes until stability or the
 /// maximum number of iterations is reached.
 /// @param Linked - Numbers of linked nodes that need updating.