gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-43.c

   1 /* PR tree-optimization/64193 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O -fdump-tree-fre1" } */
   4
   5 double T,T2,E1[5];
   6 int J;
   7
   8 void
   9 PA(double E[])
  10 {
  11  J = 0;
  12
  13 L10:
  14  E[1] = ( E[1] + E[2] + E[3] - E[4]) * T;
  15  E[2] = ( E[1] + E[2] - E[3] + E[4]) * T;
  16  E[3] = ( E[1] - E[2] + E[3] + E[4]) * T;
  17  E[4] = (-E[1] + E[2] + E[3] + E[4]) / T2;
  18  J += 1;
  19
  20  if (J < 6)
  21   goto L10;
  22 }
  23
  24 /* We should remove 15 dead loads and some related stmts, fully propagating
  25    their replacements with exactly 4 loads and 4 stores from/to E remaining.  */
  26
  27 /* { dg-final { scan-tree-dump-times "MEM" 8 "fre1" } } */