Add another test.

plat/qemuppc/tests/intadd.c

@@ -0,0 +1,31 @@
+#include "test.h"
+
+/* Constants in globals to defeat constant folding. */
+int two = 2;
+int one = 1;
+int zero = 0;
+int minusone = -1;
+
+/* Bypasses the CRT, so there's no stdio or BSS initialisation. */
+void _m_a_i_n(void)
+{
+    ASSERT((two + one)      == 3);
+    ASSERT((two + minusone) == 1);
+
+    ASSERT((two +  1) == 3);
+    ASSERT((two + -1) == 1);
+
+    ASSERT((1   + two) == 3);
+    ASSERT((-1  + two) == 1);
+
+    ASSERT(((unsigned int)two + (unsigned int)one)      == 3);
+    ASSERT(((unsigned int)two + (unsigned int)minusone) == 1);
+
+    ASSERT(((unsigned int)two + (unsigned int) 1) == 3);
+    ASSERT(((unsigned int)two + (unsigned int)-1) == 1);
+
+    ASSERT(((unsigned int)1   + (unsigned int)two) == 3);
+    ASSERT(((unsigned int)-1  + (unsigned int)two) == 1);
+
+    finished();
+}