diff options
Diffstat (limited to 'lib/Transforms/Scalar/TailDuplication.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/TailDuplication.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp index 40821e4..b687084 100644 --- a/lib/Transforms/Scalar/TailDuplication.cpp +++ b/lib/Transforms/Scalar/TailDuplication.cpp @@ -28,11 +28,15 @@ #include "llvm/Support/CFG.h" #include "llvm/Support/ValueHolder.h" #include "llvm/Transforms/Utils/Local.h" +#include "Support/CommandLine.h" #include "Support/Debug.h" #include "Support/Statistic.h" using namespace llvm; namespace { + cl::opt<unsigned> + Threshold("taildup-threshold", cl::desc("Max block size to tail duplicate"), + cl::init(6), cl::Hidden); Statistic<> NumEliminated("tailduplicate", "Number of unconditional branches eliminated"); Statistic<> NumPHINodes("tailduplicate", "Number of phi nodes inserted"); @@ -106,7 +110,7 @@ bool TailDup::shouldEliminateUnconditionalBranch(TerminatorInst *TI) { while (isa<PHINode>(*I)) ++I; for (unsigned Size = 0; I != Dest->end(); ++Size, ++I) - if (Size == 6) return false; // The block is too large... + if (Size == Threshold) return false; // The block is too large... // Do not tail duplicate a block that has thousands of successors into a block // with a single successor if the block has many other predecessors. This can |