Add a simple method for marking blocks with interference in and out.
This method matches addLinks - All the listed blocks are considered to
have interference, so they add a negative bias to their bundles.
This could also be done by addConstraints, but that requires building a
separate BlockConstraint array.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135844 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SpillPlacement.cpp b/lib/CodeGen/SpillPlacement.cpp
index 6949618..ce7b37b 100644
--- a/lib/CodeGen/SpillPlacement.cpp
+++ b/lib/CodeGen/SpillPlacement.cpp
@@ -239,6 +239,20 @@
}
}
+/// addPrefSpill - Same as addConstraints(PrefSpill)
+void SpillPlacement::addPrefSpill(ArrayRef<unsigned> Blocks) {
+ for (ArrayRef<unsigned>::iterator I = Blocks.begin(), E = Blocks.end();
+ I != E; ++I) {
+ float Freq = getBlockFrequency(*I);
+ unsigned ib = bundles->getBundle(*I, 0);
+ unsigned ob = bundles->getBundle(*I, 1);
+ activate(ib);
+ activate(ob);
+ nodes[ib].addBias(-Freq, 1);
+ nodes[ob].addBias(-Freq, 0);
+ }
+}
+
void SpillPlacement::addLinks(ArrayRef<unsigned> Links) {
for (ArrayRef<unsigned>::iterator I = Links.begin(), E = Links.end(); I != E;
++I) {
diff --git a/lib/CodeGen/SpillPlacement.h b/lib/CodeGen/SpillPlacement.h
index 6952ad8..9a4fc6d 100644
--- a/lib/CodeGen/SpillPlacement.h
+++ b/lib/CodeGen/SpillPlacement.h
@@ -96,6 +96,10 @@
/// live out.
void addConstraints(ArrayRef<BlockConstraint> LiveBlocks);
+ /// addPrefSpill - Add PrefSpill constraints to all blocks listed.
+ /// @param Blocks Array of block numbers that prefer to spill in and out.
+ void addPrefSpill(ArrayRef<unsigned> Blocks);
+
/// addLinks - Add transparent blocks with the given numbers.
void addLinks(ArrayRef<unsigned> Links);