diff --git a/llvm/test/Regression/Transforms/InstCombine/2006-12-01-BadFPVectorXform.ll b/llvm/test/Regression/Transforms/InstCombine/2006-12-01-BadFPVectorXform.ll
new file mode 100644
index 0000000000000000000000000000000000000000..496b905be62d4ddf977e114114f17926a5dd0712
--- /dev/null
+++ b/llvm/test/Regression/Transforms/InstCombine/2006-12-01-BadFPVectorXform.ll
@@ -0,0 +1,9 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep sub &&
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep add
+
+<4 x float> %test(<4 x float> %tmp26, <4 x float> %tmp53) {
+  ; (X+Y)-Y != X for fp vectors.
+  %tmp64 = add <4 x float> %tmp26, %tmp53
+  %tmp75 = sub <4 x float> %tmp64, %tmp53
+  ret <4 x float> %tmp75
+}