gcc/testsuite/g++.dg/tree-ssa/ssa-sra-1.C

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-optimized" } */
   3
   4 void link_error();
   5
   6
   7 struct State {
   8     int p0, p1, p2;
   9     inline State(){p0=0;p1=0;p2=0;}
  10     inline State(const State &s) {
  11         p0 = s.p0;
  12         p1 = s.p1;
  13         p2 = s.p2;
  14     }
  15
  16     inline void operator =(const State &s) {
  17         p0 = s.p0;
  18         p1 = s.p1;
  19         p2 = s.p2;
  20     }
  21
  22     inline void step(void) {
  23         p0 = p1+p2;
  24         p1 = p0*p1+p2;
  25         p2 = p0-p2;
  26     }
  27 };
  28
  29
  30 inline void iterate_ok(State &inS1, State &inS2, unsigned int n)
  31 {
  32     State s1 = inS1;
  33     for (unsigned int i = 0; i < n; i++) {
  34         s1.step();
  35     }
  36     inS1 = s1;
  37 }
  38
  39 void temp()
  40 {
  41   State s1;
  42   s1.p0 = 0;
  43   s1.p1 = 0;
  44   s1.p2 = 0;
  45   State s2;
  46   s2.p0 = 0;
  47   s2.p1 = 0;
  48   s2.p2 = 0;
  49   iterate_ok (s1, s2, 1);
  50   if (s1.p0)
  51    link_error();
  52   if (s1.p0)
  53    link_error();
  54   if (s1.p0)
  55    link_error();
  56 }
  57
  58 /* We should have removed the casts from pointers to references and caused SRA to happen.  */
  59
  60 /* { dg-final { scan-tree-dump-times "link_error" 0 "optimized"} } */
  61 /* { dg-final { cleanup-tree-dump "optimized" } } */