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diff --git a/test/CodeGen/X86/2009-04-27-LiveIntervalsAssert.ll b/test/CodeGen/X86/2009-04-27-LiveIntervalsAssert.ll
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--- /dev/null
+++ b/test/CodeGen/X86/2009-04-27-LiveIntervalsAssert.ll
@@ -0,0 +1,24 @@
+; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin9
+; PR4056
+
+define void @int163(i32 %p_4, i32 %p_5) nounwind {
+entry:
+ %0 = tail call i32 @bar(i32 1) nounwind ; <i32> [#uses=2]
+ %1 = icmp sgt i32 %0, 7 ; <i1> [#uses=1]
+ br i1 %1, label %foo.exit, label %bb.i
+
+bb.i: ; preds = %entry
+ %2 = lshr i32 1, %0 ; <i32> [#uses=1]
+ %3 = icmp eq i32 %2, 0 ; <i1> [#uses=1]
+ %4 = zext i1 %3 to i32 ; <i32> [#uses=1]
+ %.p_5 = shl i32 %p_5, %4 ; <i32> [#uses=1]
+ br label %foo.exit
+
+foo.exit: ; preds = %bb.i, %entry
+ %5 = phi i32 [ %.p_5, %bb.i ], [ %p_5, %entry ] ; <i32> [#uses=1]
+ %6 = icmp eq i32 %5, 0 ; <i1> [#uses=0]
+ %7 = tail call i32 @bar(i32 %p_5) nounwind ; <i32> [#uses=0]
+ ret void
+}
+
+declare i32 @bar(i32)