diff options
| -rw-r--r-- | llvm/lib/CodeGen/MachineBlockPlacement.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp index 447ad629885..374b3079c34 100644 --- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp +++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp @@ -91,6 +91,11 @@ static cl::opt<unsigned> LoopToColdBlockRatio( "(frequency of block) is greater than this ratio"), cl::init(5), cl::Hidden); +static cl::opt<bool> ForceLoopColdBlock( + "force-loop-cold-block", + cl::desc("Force outlining cold blocks from loops."), + cl::init(false), cl::Hidden); + static cl::opt<bool> PreciseRotationCost("precise-rotation-cost", cl::desc("Model the cost of loop rotation more " @@ -2146,7 +2151,7 @@ MachineBlockPlacement::collectLoopBlockSet(const MachineLoop &L) { // will be merged into the first outer loop chain for which this block is not // cold anymore. This needs precise profile data and we only do this when // profile data is available. - if (F->getFunction()->getEntryCount()) { + if (F->getFunction()->getEntryCount() || ForceLoopColdBlock) { BlockFrequency LoopFreq(0); for (auto LoopPred : L.getHeader()->predecessors()) if (!L.contains(LoopPred)) |
