diff options
| -rw-r--r-- | lib/CodeGen/RegAllocGreedy.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp index 570a832..0267717 100644 --- a/lib/CodeGen/RegAllocGreedy.cpp +++ b/lib/CodeGen/RegAllocGreedy.cpp @@ -749,7 +749,14 @@ void RAGreedy::growRegion(GlobalSplitCandidate &Cand) { // Any new blocks to add? if (ActiveBlocks.size() == AddedTo) break; - addThroughConstraints(Cand.Intf, makeArrayRef(ActiveBlocks).slice(AddedTo)); + + // Compute through constraints from the interference, or assume that all + // through blocks prefer spilling when forming compact regions. + ArrayRef<unsigned> NewBlocks = makeArrayRef(ActiveBlocks).slice(AddedTo); + if (Cand.PhysReg) + addThroughConstraints(Cand.Intf, NewBlocks); + else + SpillPlacer->addPrefSpill(NewBlocks); AddedTo = ActiveBlocks.size(); // Perhaps iterating can enable more bundles? |