If loop induction variable's start value is less then its exit value then do not split the loop.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53265 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/LoopIndexSplit/2008-07-08-MisCompilation.ll b/test/Transforms/LoopIndexSplit/2008-07-08-MisCompilation.ll
new file mode 100644
index 0000000..7592511
--- /dev/null
+++ b/test/Transforms/LoopIndexSplit/2008-07-08-MisCompilation.ll
@@ -0,0 +1,25 @@
+; RUN: llvm-as < %s | opt -loop-index-split -stats -disable-output | not grep "1 loop-index-split"
+; PR 2487
+@g_6 = external global i32 ; <i32*> [#uses=1]
+
+define void @func_1() nounwind {
+entry:
+ br label %bb
+
+bb: ; preds = %bb4, %entry
+ %l_3.0 = phi i8 [ 0, %entry ], [ %tmp6, %bb4 ] ; <i8> [#uses=2]
+ %tmp1 = icmp eq i8 %l_3.0, 0 ; <i1> [#uses=1]
+ br i1 %tmp1, label %bb3, label %bb4
+
+bb3: ; preds = %bb
+ store i32 1, i32* @g_6, align 4
+ br label %bb4
+
+bb4: ; preds = %bb3, %bb
+ %tmp6 = add i8 %l_3.0, 1 ; <i8> [#uses=2]
+ %tmp9 = icmp sgt i8 %tmp6, -1 ; <i1> [#uses=1]
+ br i1 %tmp9, label %bb, label %return
+
+return: ; preds = %bb4
+ ret void
+}