1 files changed, 24 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopStrengthReduce/2011-07-20-DoubleIV.ll b/llvm/test/Transforms/LoopStrengthReduce/2011-07-20-DoubleIV.ll
new file mode 100644
index 00000000000..3ceeeb658d1
--- /dev/null
+++ b/llvm/test/Transforms/LoopStrengthReduce/2011-07-20-DoubleIV.ll
@@ -0,0 +1,24 @@
+; RUN: opt < %s -loop-reduce -S | FileCheck %s
+;
+; Test LSR's OptimizeShadowIV. Handle a floating-point IV with a
+; nonzero initial value.
+; rdar://9786536
+
+; First, make sure LSR doesn't crash on an empty IVUsers list.
+; CHECK: @dummyIV
+; CHECK-NOT: phi
+; CHECK-NOT: sitofp
+; CHECK: br
+define void @dummyIV() nounwind {
+entry:
+  br label %loop
+
+loop:
+  %i.01 = phi i32 [ -39, %entry ], [ %inc, %loop ]
+  %conv7 = sitofp i32 %i.01 to double
+  %inc = add nsw i32 %i.01, 1
+  br i1 undef, label %loop, label %for.end
+
+for.end:
+  unreachable
+}