gcc/testsuite/gcc.dg/strlenopt-67.c

   1 /* PR tree-optimization/90989 - incorrrect strlen result after second strcpy
   2    into the same destination.
   3    { dg-do compile }
   4    { dg-options "-O2 -Wall -fdump-tree-optimized" } */
   5
   6 // #include "strlenopt.h"
   7
   8 char a[4];
   9
  10 int f4 (void)
  11 {
  12   char b[4];
  13   __builtin_strcpy (b, "12");
  14
  15   int i = __builtin_strcmp (a, b);
  16
  17   __builtin_strcpy (b, "123");
  18   if (__builtin_strlen (b) != 3)
  19     __builtin_abort ();
  20
  21   return i;
  22 }
  23
  24 int f6 (void)
  25 {
  26   char b[6];
  27   __builtin_strcpy (b, "1234");
  28
  29   int i = __builtin_strcmp (a, b);
  30
  31   __builtin_strcpy (b, "12345");
  32   if (__builtin_strlen (b) != 5)
  33     __builtin_abort ();
  34
  35   return i;
  36 }
  37
  38 int f8 (void)
  39 {
  40   char b[8];
  41   __builtin_strcpy (b, "1234");
  42
  43   int i = __builtin_strcmp (a, b);
  44
  45   __builtin_strcpy (b, "1234567");
  46   if (__builtin_strlen (b) != 7)
  47     __builtin_abort ();
  48
  49   return i;
  50 }
  51
  52 /* { dg-final { scan-tree-dump-times "abort|strlen" 0 "optimized" } } */