gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-13.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fstrict-aliasing -fno-tree-sra -fdump-tree-fre1-details" } */
   3
   4 /* Should be optimized, propagating &a into (*p)[i].  */
   5
   6 /* For this testcase we need TBAA to work.  */
   7
   8 struct Foo
   9 {
  10   void *data;
  11   int size;
  12 };
  13 void foo(double (*q)[4], struct Foo *tmp1)
  14 {
  15   double a[4];
  16   int i;
  17   tmp1->data = &a;
  18   tmp1->size = 4;
  19   for (i=0; i<4; ++i)
  20     {
  21       double (*p)[4] = tmp1->data;
  22       (*p)[i] = (*q)[i];
  23     }
  24 }
  25
  26 /* { dg-final { scan-tree-dump "Replaced tmp1_.\\\(D\\\)->data with &a" "fre1" } } */