diff options
Diffstat (limited to 'llvm/lib/Transforms/Utils/LoopUnroll.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/LoopUnroll.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Utils/LoopUnroll.cpp b/llvm/lib/Transforms/Utils/LoopUnroll.cpp index 5c3c94008d3..4fc7f410412 100644 --- a/llvm/lib/Transforms/Utils/LoopUnroll.cpp +++ b/llvm/lib/Transforms/Utils/LoopUnroll.cpp @@ -306,8 +306,10 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, unsigned TripCount, bool Force, Count = TripCount; // Don't enter the unroll code if there is nothing to do. - if (TripCount == 0 && Count < 2 && PeelCount == 0) + if (TripCount == 0 && Count < 2 && PeelCount == 0) { + DEBUG(dbgs() << "Won't unroll; almost nothing to do\n"); return false; + } assert(Count > 0); assert(TripMultiple > 0); @@ -362,8 +364,12 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, unsigned TripCount, bool Force, PreserveLCSSA)) { if (Force) RuntimeTripCount = false; - else + else { + DEBUG( + dbgs() << "Wont unroll; prolog and epilog code could not be inserted " + "when assuming runtime trip count\n"); return false; + } } // Notify ScalarEvolution that the loop will be substantially changed, |
