Do not ignore iv uses outside the loop.
This one slipped through cracks very well.
llvm-svn: 56284
diff --git a/llvm/test/Transforms/LoopIndexSplit/2008-09-17-IVUse.ll b/llvm/test/Transforms/LoopIndexSplit/2008-09-17-IVUse.ll
new file mode 100644
index 0000000..a7a7cc2
--- /dev/null
+++ b/llvm/test/Transforms/LoopIndexSplit/2008-09-17-IVUse.ll
@@ -0,0 +1,78 @@
+; RUN: llvm-as < %s | opt -loop-index-split -stats -disable-output | not grep "loop-index-split"
+; PR 2791
+@g_40 = common global i32 0 ; <i32*> [#uses=1]
+@g_192 = common global i32 0 ; <i32*> [#uses=2]
+@"\01LC" = internal constant [4 x i8] c"%d\0A\00" ; <[4 x i8]*> [#uses=1]
+
+define void @func_29() nounwind {
+entry:
+ %0 = load i32* @g_40, align 4 ; <i32> [#uses=1]
+ %1 = icmp eq i32 %0, 0 ; <i1> [#uses=1]
+ %g_192.promoted = load i32* @g_192 ; <i32> [#uses=0]
+ br i1 %1, label %entry.split.us, label %entry.split
+
+entry.split.us: ; preds = %entry
+ br label %bb.us
+
+bb.us: ; preds = %bb5.us, %entry.split.us
+ %i.0.reg2mem.0.us = phi i32 [ 0, %entry.split.us ], [ %3, %bb5.us ] ; <i32> [#uses=2]
+ %2 = icmp eq i32 %i.0.reg2mem.0.us, 0 ; <i1> [#uses=1]
+ br i1 %2, label %bb1.us, label %bb5.us
+
+bb5.us: ; preds = %bb1.us, %bb4.us, %bb.us
+ %iftmp.0.0.us = phi i32 [ 0, %bb4.us ], [ 1, %bb.us ], [ 1, %bb1.us ] ; <i32> [#uses=1]
+ %3 = add i32 %i.0.reg2mem.0.us, 1 ; <i32> [#uses=3]
+ %4 = icmp ult i32 %3, 10 ; <i1> [#uses=1]
+ br i1 %4, label %bb.us, label %bb8.us
+
+bb4.us: ; preds = %bb1.us
+ br label %bb5.us
+
+bb1.us: ; preds = %bb.us
+ br i1 true, label %bb4.us, label %bb5.us
+
+bb8.us: ; preds = %bb5.us
+ %iftmp.0.0.lcssa.us = phi i32 [ %iftmp.0.0.us, %bb5.us ] ; <i32> [#uses=1]
+ %.lcssa.us = phi i32 [ %3, %bb5.us ] ; <i32> [#uses=1]
+ br label %bb8.split
+
+entry.split: ; preds = %entry
+ br label %bb
+
+bb: ; preds = %bb5, %entry.split
+ %i.0.reg2mem.0 = phi i32 [ 0, %entry.split ], [ %6, %bb5 ] ; <i32> [#uses=2]
+ %5 = icmp eq i32 %i.0.reg2mem.0, 0 ; <i1> [#uses=1]
+ br i1 %5, label %bb1, label %bb5
+
+bb1: ; preds = %bb
+ br i1 false, label %bb4, label %bb5
+
+bb4: ; preds = %bb1
+ br label %bb5
+
+bb5: ; preds = %bb1, %bb, %bb4
+ %iftmp.0.0 = phi i32 [ 0, %bb4 ], [ 1, %bb ], [ 1, %bb1 ] ; <i32> [#uses=1]
+ %6 = add i32 %i.0.reg2mem.0, 1 ; <i32> [#uses=3]
+ %7 = icmp ult i32 %6, 10 ; <i1> [#uses=1]
+ br i1 %7, label %bb, label %bb8
+
+bb8: ; preds = %bb5
+ %iftmp.0.0.lcssa = phi i32 [ %iftmp.0.0, %bb5 ] ; <i32> [#uses=1]
+ %.lcssa = phi i32 [ %6, %bb5 ] ; <i32> [#uses=1]
+ br label %bb8.split
+
+bb8.split: ; preds = %bb8.us, %bb8
+ %iftmp.0.0.lcssa.us-lcssa = phi i32 [ %iftmp.0.0.lcssa, %bb8 ], [ %iftmp.0.0.lcssa.us, %bb8.us ] ; <i32> [#uses=1]
+ %.lcssa.us-lcssa = phi i32 [ %.lcssa, %bb8 ], [ %.lcssa.us, %bb8.us ] ; <i32> [#uses=1]
+ store i32 %iftmp.0.0.lcssa.us-lcssa, i32* @g_192
+ %8 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @"\01LC", i32 0, i32 0), i32 %.lcssa.us-lcssa ) nounwind ; <i32> [#uses=0]
+ ret void
+}
+
+declare i32 @printf(i8*, ...) nounwind
+
+define i32 @main() nounwind {
+entry:
+ call void @func_29( ) nounwind
+ ret i32 0
+}