gcc/testsuite/gcc.dg/store_merging_20.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target store_merge } */
   3 /* { dg-options "-O2 -fdump-tree-store-merging" } */
   4
   5 extern void abort (void);
   6
   7 struct S1 {
   8   unsigned int flag : 1;
   9   unsigned int size : 31;
  10 };
  11
  12 __attribute__((noipa))
  13 void foo1 (struct S1 *s, unsigned int size)
  14 {
  15   s->flag = 1;
  16   s->size = size & 0x7FFFFFFF;
  17 }
  18
  19 struct S2 {
  20   unsigned int flag : 1;
  21   unsigned int size : 15;
  22   unsigned short count;
  23 };
  24
  25 __attribute__((noipa))
  26 void foo2 (struct S2 *s, unsigned short size)
  27 {
  28   s->flag = 1;
  29   s->size = size;
  30   s->count = 0xABCD;
  31 }
  32
  33 struct S3 {
  34   unsigned int n1 : 4;
  35   unsigned int c  : 8;
  36   unsigned int n2 : 4;
  37 };
  38
  39 __attribute__((noipa))
  40 void foo3 (struct S3 *s, unsigned char n1, unsigned char c, unsigned char n2)
  41 {
  42   s->n1 = n1 & 0xF;
  43   s->n2 = n2 & 0xF;
  44   s->c = c;
  45 }
  46
  47 int main (void)
  48 {
  49   struct S1 s1;
  50   struct S2 s2;
  51   struct S3 s3;
  52
  53   foo1 (&s1, 0x12345678);
  54   if (s1.flag != 1 || s1.size != 0x12345678)
  55     abort ();
  56
  57   foo2 (&s2, 0x1234);
  58   if (s2.flag != 1 || s2.size != 0x1234 || s2.count != 0xABCD)
  59     abort ();
  60
  61   foo3 (&s3, 0x12, 0x34, 0x56);
  62   if (s3.n1 != 0x2 || s3.c != 0x34 || s3.n2 != 0x6)
  63     abort ();
  64
  65   return 0;
  66 }
  67
  68 /* { dg-final { scan-tree-dump-times "Merging successful" 3 "store-merging" } } */