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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 /test/Analysis/ScalarEvolution | |
| 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 'test/Analysis/ScalarEvolution')
| -rw-r--r-- | test/Analysis/ScalarEvolution/how-far-to-zero.ll | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/how-far-to-zero.ll b/test/Analysis/ScalarEvolution/how-far-to-zero.ll new file mode 100644 index 0000000000..07af88ffbe --- /dev/null +++ b/test/Analysis/ScalarEvolution/how-far-to-zero.ll @@ -0,0 +1,27 @@ +; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s + +; PR13228 +define void @f() nounwind uwtable readnone { +entry: + br label %for.cond + +for.cond: ; preds = %for.cond, %entry + %c.0 = phi i8 [ 1, %entry ], [ 0, %for.cond ] + %i.0 = phi i8 [ 0, %entry ], [ %inc, %for.cond ] + %lnot = icmp eq i8 %i.0, 0 + %inc = add i8 %i.0, 1 + br i1 %lnot, label %for.cond, label %while.cond + +while.cond: ; preds = %while.body, %for.cond + %b.2 = phi i8 [ %add, %while.body ], [ 0, %for.cond ] + br i1 undef, label %while.end, label %while.body + +while.body: ; preds = %while.cond + %add = add i8 %b.2, %c.0 + %tobool7 = icmp eq i8 %add, 0 + br i1 %tobool7, label %while.end, label %while.cond + +while.end: ; preds = %while.body, %while.cond + ret void +} +;CHECK: Loop %while.cond: <multiple exits> Unpredictable backedge-taken count. |