gcc/testsuite/gcc.dg/tree-ssa/pr71347.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3
   4 double in;
   5 extern void Write (double);
   6 void foo (void)
   7 {
   8   static double X[9];
   9   int i;
  10         X[1] = in * in;
  11         for (i = 2; i <= 8; i++)
  12             X[i] = X[i - 1] * X[1];
  13         Write (X[5]);
  14 }
  15
  16 /* Load of X[i - i] can be omitted by reusing X[i] in previous iteration.  */
  17 /* { dg-final { scan-tree-dump-not ".* = MEM.*;" "optimized"} } */