From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Wed, 22 May 2019 14:18:17 +0000 (+0000)
Subject: LoopVectorizationCostModel::selectInterleaveCount - assert we have a non-zero loop... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=79e92fbf63cd6154c70d947cd365f47f6a33ed07;p=llvm

LoopVectorizationCostModel::selectInterleaveCount - assert we have a non-zero loop cost. NFCI.

The input LoopCost value can be zero, but if so it should be recalculated with the current VF. After that it should always be non-zero.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@361387 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp
index ce03b854ffd..ad3030cedc3 100644
--- a/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -5001,6 +5001,8 @@ unsigned LoopVectorizationCostModel::selectInterleaveCount(bool OptForSize,
   if (LoopCost == 0)
     LoopCost = expectedCost(VF).first;
 
+  assert(LoopCost && "Non-zero loop cost expected");
+
   // Clamp the calculated IC to be between the 1 and the max interleave count
   // that the target allows.
   if (IC > MaxInterleaveCount)