b/gcc/testsuite/gcc.dg/vect/pr52252-st.c
new file mode 100644
@@ -0,0 +1,21 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-mssse3" { target { i?86-*-* x86_64-*-* } } } */
+
+#define byte unsigned char
+
+void
+matrix_mul (byte *in, byte *out, int size)
+{
+ int i;
+ for (i = 0; i < size; i++)
+ {
+ out[0] = in[0] + in[1] + in[3];
+ out[1] = in[0] + in[2] + in[4];
+ out[2] = in[1] + in[2] + in[4];
+ in += 4;
+ out += 3;
+ }
+}
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" {
target { i?86-*-* x86_64-*-* } } } } */