added tests as prepared by oliver

test/val/xor.c

@@ -0,0 +1,64 @@
+/*
+  !!DESCRIPTION!!
+  !!ORIGIN!!      SDCC regression tests
+  !!LICENCE!!     GPL, read COPYING.GPL
+*/
+
+#include <stdio.h>
+#include <limits.h>
+
+unsigned char success=0;
+unsigned char failures=0;
+unsigned char dummy=0;
+
+unsigned char achar0 = 0;
+unsigned char achar1 = 0;
+unsigned char achar2 = 0;
+
+void done()
+{
+  dummy++;
+}
+
+void xor_chars_0_1(void)
+{
+  achar2 = achar0 ^ achar1;
+
+  achar0 = achar0 ^ 0x1;
+
+  achar1 = achar0 ^ achar1 ^ 4;
+}
+
+void xor_if(void)
+{
+  if(achar0 ^ achar1) 
+    failures++;
+
+  achar0 ^= 0xff;
+
+  if( !(achar0 ^ achar1) ) 
+    failures++;
+}
+
+int  main(void)
+{
+  xor_chars_0_1();
+
+  if(achar2)
+    failures++;
+
+  if(achar0 != 1)
+    failures++;
+
+  if(achar1 != 5)
+    failures++;
+
+  achar0 = achar1;
+  xor_if();
+
+  success = failures;
+  done();
+  printf("failures: %d\n",failures);
+
+  return failures;
+}