commit 37eb38d3f8531115f17f4e829013ccb513952bad
author Andrew Trick <atrick@apple.com> Thu Jul 21 00:40:04 2011 +0000
committer Andrew Trick <atrick@apple.com> Thu Jul 21 00:40:04 2011 +0000
tree 573ffec2fcbe10ca4bc29bcd3a48d0e6d895db8b
parent 36c62d3cbe04fc2bde371fa4bda4085baffc799f

LSR crashes on an empty IVUsers list.

rdar://9786536


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135644 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/LoopStrengthReduce.cpp

diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index e90b5bc..4598df0 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -3740,6 +3740,9 @@
   OptimizeShadowIV();
   OptimizeLoopTermCond();
 
+  // If loop preparation eliminates all interesting IV users, bail.
+  if (IU.empty()) return;
+
   // Start collecting data and preparing for the solver.
   CollectInterestingTypesAndFactors();
   CollectFixupsAndInitialFormulae();