view gcc/testsuite/gcc.dg/tree-ssa/loop-8.c @ 158:494b0b89df80 default tip

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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 04ced10e8804
children
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/* A test for strength reduction of ivs with nonconstant step.  */

/* { dg-do compile } */
/* { dg-options "-O1 -fdump-tree-optimized" } */

int bar (void);

int a[100];

void xxx (void)
{
  int iter, step = bar ();

  for (iter = 0; iter < 10; iter++)
    a[iter * step] = bar ();
}

/* The array access should be strength reduced.  But to determine the value of
   the step, we need to calculate step * sizeof (int), thus we need to be
   a bit careful about which multiplications we disallow.  */

/* { dg-final { scan-tree-dump-times "step \\* \[^0-9\]" 0 "optimized" } } */
/* { dg-final { scan-tree-dump-times "\[^0-9\] \\* step" 0 "optimized" } } */