diff options
Diffstat (limited to 'lib/CodeGen/RegAllocGreedy.cpp')
| -rw-r--r-- | lib/CodeGen/RegAllocGreedy.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp index 1cbd5a925f..4c130d0026 100644 --- a/lib/CodeGen/RegAllocGreedy.cpp +++ b/lib/CodeGen/RegAllocGreedy.cpp @@ -806,7 +806,9 @@ void RAGreedy::growRegion(GlobalSplitCandidate &Cand) { if (Cand.PhysReg) addThroughConstraints(Cand.Intf, NewBlocks); else - SpillPlacer->addPrefSpill(NewBlocks); + // Provide a strong negative bias on through blocks to prevent unwanted + // liveness on loop backedges. + SpillPlacer->addPrefSpill(NewBlocks, /* Strong= */ true); AddedTo = ActiveBlocks.size(); // Perhaps iterating can enable more bundles? |