diff options
Diffstat (limited to 'lib/CodeGen/SplitKit.cpp')
-rw-r--r-- | lib/CodeGen/SplitKit.cpp | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp index c6e1bd57bd..427ef94ad7 100644 --- a/lib/CodeGen/SplitKit.cpp +++ b/lib/CodeGen/SplitKit.cpp @@ -221,6 +221,29 @@ bool SplitAnalysis::calcLiveBlockInfo() { return true; } +unsigned SplitAnalysis::countLiveBlocks(const LiveInterval *cli) const { + if (cli->empty()) + return 0; + LiveInterval *li = const_cast<LiveInterval*>(cli); + LiveInterval::iterator LVI = li->begin(); + LiveInterval::iterator LVE = li->end(); + unsigned Count = 0; + + // Loop over basic blocks where li is live. + MachineFunction::const_iterator MFI = LIS.getMBBFromIndex(LVI->start); + SlotIndex Stop = LIS.getMBBEndIdx(MFI); + for (;;) { + ++Count; + LVI = li->advanceTo(LVI, Stop); + if (LVI == LVE) + return Count; + do { + ++MFI; + Stop = LIS.getMBBEndIdx(MFI); + } while (Stop <= LVI->start); + } +} + bool SplitAnalysis::isOriginalEndpoint(SlotIndex Idx) const { unsigned OrigReg = VRM.getOriginal(CurLI->reg); const LiveInterval &Orig = LIS.getInterval(OrigReg); |