diff --git a/test/CodeGen/X86/2007-10-16-CoalescerCrash.ll b/test/CodeGen/X86/2007-10-16-CoalescerCrash.ll
new file mode 100644
index 00000000000..a414ef0d862
--- /dev/null
+++ b/test/CodeGen/X86/2007-10-16-CoalescerCrash.ll
@@ -0,0 +1,31 @@
+; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin
+
+define i64 @__ashldi3(i64 %u, i64 %b) {
+entry:
+        br i1 false, label %UnifiedReturnBlock, label %cond_next
+
+cond_next:              ; preds = %entry
+        %tmp9 = sub i64 32, %b          ; <i64> [#uses=2]
+        %tmp11 = icmp slt i64 %tmp9, 1          ; <i1> [#uses=1]
+        %tmp2180 = trunc i64 %u to i32          ; <i32> [#uses=2]
+        %tmp2223 = trunc i64 %tmp9 to i32               ; <i32> [#uses=2]
+        br i1 %tmp11, label %cond_true14, label %cond_false
+
+cond_true14:            ; preds = %cond_next
+        %tmp24 = sub i32 0, %tmp2223            ; <i32> [#uses=1]
+        %tmp25 = shl i32 %tmp2180, %tmp24               ; <i32> [#uses=1]
+        %tmp2569 = zext i32 %tmp25 to i64               ; <i64> [#uses=1]
+        %tmp256970 = shl i64 %tmp2569, 32               ; <i64> [#uses=1]
+        ret i64 %tmp256970
+
+cond_false:             ; preds = %cond_next
+        %tmp35 = lshr i32 %tmp2180, %tmp2223            ; <i32> [#uses=1]
+        %tmp54 = or i32 %tmp35, 0               ; <i32> [#uses=1]
+        %tmp5464 = zext i32 %tmp54 to i64               ; <i64> [#uses=1]
+        %tmp546465 = shl i64 %tmp5464, 32               ; <i64> [#uses=1]
+        %tmp546465.ins = or i64 %tmp546465, 0           ; <i64> [#uses=1]
+        ret i64 %tmp546465.ins
+
+UnifiedReturnBlock:
+        ret i64 %u
+}