File: pr71347.c

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gcc-arm-none-eabi 15%3A7-2018-q2-5
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/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized -fpredictive-commoning" } */

double in;
extern void Write (double);
void foo (void)
{
  static double X[9];
  int i;
        X[1] = in * in;
        for (i = 2; i <= 8; i++)
            X[i] = X[i - 1] * X[1];
        Write (X[5]);
}

/* Load of X[i - i] can be omitted by reusing X[i] in previous iteration.  */
/* { dg-final { scan-tree-dump-not ".* = MEM.*;" "optimized" } } */