gcc/testsuite/gcc.dg/hoist-register-pressure-3.c

   1 /* { dg-options "-Os -fdump-rtl-hoist" }  */
   2 /* { dg-final { scan-rtl-dump "PRE/HOIST: end of bb .* copying expression" "hoist" } } */
   3
   4 #define BUF 100
   5 int a[BUF];
   6
   7 void com (int);
   8 void bar (int);
   9
  10 int foo (int x, int y, int z)
  11 {
  12   /* "x+y" won't be hoisted if "-fira-hoist-pressure" is disabled,
  13      because its rtx_cost is too small.  */
  14   if (z)
  15     {
  16       a[1] = a[0] + a[2] + a[3] + a[4] + a[5] + a[6];
  17       a[2] = a[1] + a[3] + a[5] + a[5] + a[6] + a[7];
  18       a[3] = a[2] + a[5] + a[7] + a[6] + a[7] + a[8];
  19       a[4] = a[3] + a[7] + a[11] + a[7] + a[8] + a[9];
  20       a[5] = a[5] + a[11] + a[13] + a[8] + a[9] + a[10];
  21       a[6] = a[7] + a[13] + a[17] + a[9] + a[10] + a[11];
  22       a[7] = a[11] + a[17] + a[19] + a[10] + a[11] + a[12];
  23       com (x+y);
  24     }
  25   else
  26     {
  27       bar (x+y);
  28     }
  29
  30   return 0;
  31 }
  32