1 files changed, 18 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.target/i386/mmx-5.c b/gcc/testsuite/gcc.target/i386/mmx-5.c
new file mode 100644
index 000000000..a58fbb7b1
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/mmx-5.c
@@ -0,0 +1,18 @@
+/* PR rtl-optimization/17853 */
+/* Contributed by Stuart Hastings <stuart@apple.com> */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mmmx" } */
+#include <mmintrin.h>
+#include <stdlib.h>
+
+__m64 global_mask;
+
+int main()
+{
+    __m64 zero = _mm_setzero_si64();
+    __m64 mask = _mm_cmpeq_pi8( zero, zero );
+    mask = _mm_unpacklo_pi8( mask, zero );
+    global_mask = mask;
+    return 0;
+}
+