diff options
Diffstat (limited to 'lib/Transforms/Scalar/LoopUnroll.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopUnroll.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/LoopUnroll.cpp b/lib/Transforms/Scalar/LoopUnroll.cpp index d1770da8fc..b0db806a49 100644 --- a/lib/Transforms/Scalar/LoopUnroll.cpp +++ b/lib/Transforms/Scalar/LoopUnroll.cpp @@ -190,10 +190,15 @@ bool LoopUnroll::visitLoop(Loop *L) { ConstantInt *TripCountC = dyn_cast_or_null<ConstantInt>(L->getTripCount()); if (!TripCountC) return Changed; // Must have constant trip count! - uint64_t TripCountFull = TripCountC->getZExtValue(); - if (TripCountFull != TripCountC->getZExtValue() || TripCountFull == 0) + // Guard against huge trip counts. This also guards against assertions in + // APInt from the use of getZExtValue, below. + if (TripCountC->getValue().getActiveBits() > 32) return Changed; // More than 2^32 iterations??? + uint64_t TripCountFull = TripCountC->getZExtValue(); + if (TripCountFull == 0) + return Changed; // Zero iteraitons? + unsigned LoopSize = ApproximateLoopSize(L); DOUT << "Loop Unroll: F[" << Header->getParent()->getName() << "] Loop %" << Header->getName() << " Loop Size = " |