new testcase

llvm-svn: 39882
diff --git a/llvm/test/CFrontend/exact-div-expr.c b/llvm/test/CFrontend/exact-div-expr.c
new file mode 100644
index 0000000..6cda928
--- /dev/null
+++ b/llvm/test/CFrontend/exact-div-expr.c
@@ -0,0 +1,6 @@
+// RUN: %llvmgcc -S %s -o - -O | grep ashr
+// RUN: %llvmgcc -S %s -o - -O | not grep sdiv
+
+int test(int *A, int *B) {
+  return A-B;
+}