1  /* Check that GCC does not generates Armv8.1-M low over head loop
       2     instructions.  Innermost loop has no fixed number of iterations
       3     therefore is not optimizable.  Outer loops are not optimized.  */
       4  /* { dg-do compile } */
       5  /* { dg-skip-if "avoid conflicting multilib options" { *-*-* } { "-marm" "-mcpu=*" } } */
       6  /* { dg-options "-march=armv8.1-m.main+fp -mthumb -O3 --save-temps" } */
       7  #include <stdlib.h>
       8  #include "lob.h"
       9  
      10  int a[N];
      11  int b[N];
      12  int c[N];
      13  
      14  int
      15  main (void)
      16  {
      17    for (int i = 0; i < N; i++)
      18      {
      19        a[i] = i;
      20        b[i] = i * 2;
      21  
      22        int k = b[i];
      23        while (k != 0)
      24  	{
      25  	  if (k % 2 == 0)
      26  	    c[i - 1] = k % 2;
      27  	  k /= 2;
      28  	}
      29        c[i] = a[i] - b[i];
      30      }
      31  
      32    return 0;
      33  }
      34  /* { dg-final { scan-assembler-not {dls\s\S*,\s\S*} } } */
      35  /* { dg-final { scan-assembler-not {le\slr,\s\S*} } } */