gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-14.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fno-tree-sra -fdump-tree-fre1-details" } */
   3
   4 /* Should be optimized, propagating &a into (*p)[i].  */
   5
   6 struct Foo
   7 {
   8   void *data;
   9   double size;
  10 };
  11 void bar(double *);
  12 void foo(double (*q)[4])
  13 {
  14   struct Foo tmp1;
  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       /* We want a PHI for the VOP for accessing tmp1.data, so place
  24          this store to tmp1 here.  */
  25       tmp1.size -= 1.0;
  26     }
  27   bar(a);
  28 }
  29
  30 /* { dg-final { scan-tree-dump "Replaced tmp1.data with &a" "fre1" } } */