diff --git a/llvm/test/Regression/Transforms/Reassociate/2002-05-15-SubReassociate.ll b/llvm/test/Regression/Transforms/Reassociate/2002-05-15-SubReassociate.ll
new file mode 100644
index 000000000000..fcbd723c0993
--- /dev/null
+++ b/llvm/test/Regression/Transforms/Reassociate/2002-05-15-SubReassociate.ll
@@ -0,0 +1,14 @@
+; With sub reassociation, constant folding can eliminate all of the constants.
+;
+; RUN: if as < %s | opt -reassociate -constprop -instcombine -dce | dis | grep add
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+int "test"(int %A, int %B) {
+	%W = add int -5, %B
+	%X = add int -7, %A
+	%Y = sub int %X, %W
+	%Z = add int %Y, 12
+	ret int %Z
+}
diff --git a/llvm/test/Regression/Transforms/Reassociate/2002-05-15-SubReassociate2.ll b/llvm/test/Regression/Transforms/Reassociate/2002-05-15-SubReassociate2.ll
new file mode 100644
index 000000000000..aa0066a1ff37
--- /dev/null
+++ b/llvm/test/Regression/Transforms/Reassociate/2002-05-15-SubReassociate2.ll
@@ -0,0 +1,15 @@
+; With sub reassociation, constant folding can eliminate the two 12 constants.
+;
+; RUN: if as < %s | opt -reassociate -constprop -dce | dis | grep 12
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+
+int "test"(int %A, int %B, int %C, int %D) {
+	%M = add int %A, 12
+	%N = add int %M, %B
+	%O = add int %N, %C
+	%P = sub int %D, %O
+	%Q = add int %P, 12
+	ret int %Q
+}