gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-8.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O -fno-tree-sra -fdump-tree-fre1-details" } */
   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 union U {
  11   intflt i;
  12   float f;
  13 };
  14 intflt foo(int i, int b)
  15 {
  16   union U u;
  17   if (b)
  18     {
  19       i = i << 2;
  20       u.i = i;
  21       return u.f;
  22     }
  23   else
  24     {
  25       i = i << 2;
  26       u.i = i;
  27       return u.f;
  28     }
  29 }
  30
  31 /* { dg-final { scan-tree-dump-times "Replaced u.f with" 2 "fre1" } } */
  32 /* { dg-final { scan-tree-dump-times "Inserted" 2 "fre1" } } */