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| author | Nick Lewycky <nicholas@mxc.ca> | 2012-06-28 23:44:57 +0000 |
|---|---|---|
| committer | Nick Lewycky <nicholas@mxc.ca> | 2012-06-28 23:44:57 +0000 |
| commit | 4d3bba5be47ec159ad3489793248acc812d75575 (patch) | |
| tree | 020ba7b2636ed17b2c57199d012165338960a1fc /lib/Analysis/ScalarEvolution.cpp | |
| parent | 917f97c580c3ba16faa291884d6600cf2b275c99 (diff) | |
| download | llvm-4d3bba5be47ec159ad3489793248acc812d75575.tar.gz llvm-4d3bba5be47ec159ad3489793248acc812d75575.tar.bz2 llvm-4d3bba5be47ec159ad3489793248acc812d75575.tar.xz | |
If the step value is a constant zero, the loop isn't going to terminate. Fixes
the assert reported in PR13228!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159393 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 886812be5f..09410496d3 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -5484,7 +5484,7 @@ ScalarEvolution::HowFarToZero(const SCEV *V, const Loop *L) { // to 0, it must be counting down to equal 0. Consequently, N = Start / -Step. // We have not yet seen any such cases. const SCEVConstant *StepC = dyn_cast<SCEVConstant>(Step); - if (StepC == 0) + if (StepC == 0 || StepC->getValue()->equalsInt(0)) return getCouldNotCompute(); // For positive steps (counting up until unsigned overflow): |