testcase for strange loop depths in loopana

[r16116]

diff --git a/ir/be/test/loopana.c b/ir/be/test/loopana.c
new file mode 100644 (file)
index 0000000..44c5618
--- /dev/null
+++ b/ir/be/test/loopana.c
@@ -0,0 +1,50 @@
+/* the loop analysis produces strange loop depths here... */
+
+typedef struct OP {
+       int bla;
+       int blup;
+       int op_seq;
+       int op_type;
+       struct OP *next;
+} OP;
+
+OP operation1;
+OP operation2 = { 1, 2, 0, 4, &operation1 };
+OP *ptr = &operation2;
+
+int main(int argc, char **argv)
+{
+       OP *o = ptr;
+
+       if(!o || o->op_seq)
+               return;
+       printf("%d\n", o->op_seq);
+       rand();
+
+       for( ; o; o = o->next) {
+               if(o->op_seq)
+                       break;
+               if(o->bla > 52)
+                       o->bla -= 20;
+
+               switch(o->bla) {
+               case 1:
+               case 201:
+                       printf("%d\n", o->bla);
+                       break;
+               default:
+                       printf("hmm\n");
+#if 0
+                       while(rand() > 10000)
+                               ;
+#endif
+                       break;
+               case 500:
+                       printf("jummy\n");
+                       break;
+               }
+       }
+       printf("hjo\n");
+
+       return 0;
+}