gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-7.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fdump-tree-fre-details -fdump-tree-optimized" } */
   3 #if (__SIZEOF_INT__ == __SIZEOF_FLOAT__)
   4 typedef int intflt;
   5 #elif (__SIZEOF_LONG__ == __SIZEOF_FLOAT__)
   6 typedef long intflt;
   7 #else
   8 #error Add target support here for type that will union float size
   9 #endif
  10
  11 struct X {
  12   int i;
  13   union {
  14     intflt j;
  15     intflt k;
  16     float f;
  17   } u;
  18 };
  19
  20 intflt foo(intflt j)
  21 {
  22   struct X a;
  23
  24   a.u.j = j;
  25   a.u.f = a.u.f;
  26   a.u.f = a.u.f;
  27   a.u.j = a.u.j;
  28   a.u.f = a.u.f;
  29   return a.u.k;
  30 }
  31
  32 /* { dg-final { scan-tree-dump-times "Inserted pretmp" 1 "fre" } } */
  33 /* { dg-final { scan-tree-dump-times "Replaced a.u.f with pretmp" 3 "fre" } } */
  34 /* { dg-final { scan-tree-dump-times "Replaced a.u.k with j" 1 "fre" } } */
  35 /* { dg-final { scan-tree-dump "= VIEW_CONVERT_EXPR<float>\\\(j_" "fre" } } */
  36 /* { dg-final { scan-tree-dump "return j" "optimized" } } */
  37 /* { dg-final { cleanup-tree-dump "fre" } } */
  38 /* { dg-final { cleanup-tree-dump "optimized" } } */