diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp index e767bbad7ed..cfef95e1e8a 100644 --- a/lib/CodeGen/RegAllocGreedy.cpp +++ b/lib/CodeGen/RegAllocGreedy.cpp @@ -746,8 +746,7 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg, continue; } - if (IP.second.getBoundaryIndex() < BI.LastUse && - IP.second.getBoundaryIndex() <= BI.LastSplitPoint) { + if (IP.second.getBoundaryIndex() < BI.LastUse) { // There are interference-free uses at the end of the block. // Find the first use that can get the live-out register. SmallVectorImpl::const_iterator UI = @@ -755,13 +754,16 @@ void RAGreedy::splitAroundRegion(LiveInterval &VirtReg, unsigned PhysReg, IP.second.getBoundaryIndex()); assert(UI != SA->UseSlots.end() && "Couldn't find last use"); SlotIndex Use = *UI; - DEBUG(dbgs() << ", free use at " << Use << ".\n"); assert(Use <= BI.LastUse && "Couldn't find last use"); - SlotIndex SegStart = SE.enterIntvBefore(Use); - assert(SegStart >= IP.second && "Couldn't avoid interference"); - assert(SegStart < BI.LastSplitPoint && "Impossible split point"); - SE.useIntv(SegStart, Stop); - continue; + // Only attempt a split befroe the last split point. + if (Use.getBaseIndex() <= BI.LastSplitPoint) { + DEBUG(dbgs() << ", free use at " << Use << ".\n"); + SlotIndex SegStart = SE.enterIntvBefore(Use); + assert(SegStart >= IP.second && "Couldn't avoid interference"); + assert(SegStart < BI.LastSplitPoint && "Impossible split point"); + SE.useIntv(SegStart, Stop); + continue; + } } // Interference is after the last use.