gcc/testsuite/gcc.target/sh/pr51244-13.c

   1 /* This is a case extracted from CSiBE which contained the following
   2    sequence:
   3         shll    r0
   4         movt    r0
   5         tst     r0,r0
   6         bf      .L11
   7    where the 'tst r0,r0' before the branch can be omitted by inverting the
   8    branch condition.  The tested function contains two other tst insns.  If
   9    everything goes as expected we will be seeing only those other two tst
  10    insns.  */
  11 /* { dg-do compile }  */
  12 /* { dg-options "-O2" } */
  13 /* { dg-final { scan-assembler-times "tst" 2 } } */
  14
  15 void printk (const char*, const char*, int);
  16 void __constant_set_bit (int, unsigned long int*);
  17 void __set_bit (int, unsigned long int*);
  18
  19 static __inline__ int
  20 __test_bit (unsigned long nr, volatile void * addr)
  21 {
  22   /*  This is on purpose.  */
  23   int oldbit;
  24   return oldbit & 1;
  25 }
  26
  27 static __inline__ int
  28 __constant_test_bit (unsigned long nr, volatile void * addr)
  29 {
  30   return (((volatile char *) addr)[(nr>>3)^7] & (1<<(nr&7))) != 0;
  31 }
  32
  33 struct list_head
  34 {
  35   struct list_head *next, *prev;
  36 };
  37
  38 void list_add (struct list_head*, struct list_head*);
  39
  40 static inline void
  41 __list_del (struct list_head *prev, struct list_head *next)
  42 {
  43   next->prev = prev;
  44   prev->next = next;
  45 }
  46
  47 static inline void
  48 list_del (struct list_head *entry)
  49 {
  50  __list_del(entry->prev, entry->next);
  51  entry->next = 0;
  52  entry->prev = 0;
  53 }
  54
  55 extern int nr_active_pages;
  56 extern int nr_inactive_pages;
  57 extern struct list_head active_list;
  58
  59 typedef struct page
  60 {
  61  unsigned long flags;
  62  struct list_head lru;
  63 } mem_map_t;
  64
  65 void
  66 activate_page_nolock (struct page * page)
  67 {
  68  if ((__builtin_constant_p((6))
  69       ? __constant_test_bit((6),(&(page)->flags))
  70       : __test_bit((6),(&(page)->flags)) )
  71      && !(__builtin_constant_p((7))
  72           ? __constant_test_bit((7),(&(page)->flags))
  73           : __test_bit((7),(&(page)->flags)) ))
  74     {
  75       list_del(&(page)->lru);
  76       nr_inactive_pages--;
  77       if (!(__builtin_constant_p(6) ? __constant_test_bit((6),(&(page)->flags))
  78                                     : __test_bit((6),(&(page)->flags))))
  79         printk("", "", 43);
  80
  81       if ((__builtin_constant_p(7) ? __constant_test_bit((7),(&(page)->flags))
  82                                    : __test_bit((7),(&(page)->flags))))
  83         printk("", "", 43);
  84
  85       (__builtin_constant_p(7) ? __constant_set_bit((7),(&(page)->flags))
  86                                 : __set_bit((7),(&(page)->flags)) );
  87       list_add(&(page)->lru, &active_list);
  88       nr_active_pages++;
  89     }
  90 }