Viewing file:  strlenopt-2.c (1.37 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2 -fdump-tree-strlen" } */
#include "strlenopt.h"
__attribute__((noinline, noclone)) char *
foo (char *p, char *r)
{
char buf[26];
if (strlen (p) + strlen (r) + 9 > 26)
return NULL;
/* This strcpy can be optimized into memcpy, using the remembered
strlen (p). */
strcpy (buf, p);
/* These two strcat can be optimized into memcpy. The first one
could be even optimized into a *ptr = '/'; store as the '\0'
is immediately overwritten. */
strcat (buf, "/");
strcat (buf, "abcde");
/* This strcpy can be optimized into memcpy, using the remembered
strlen (r). */
strcat (buf, r);
/* And this can be optimized into memcpy too. */
strcat (buf, "fg");
return strdup (buf);
}
int
main ()
{
char *volatile p = "string1";
char *volatile r = "string2";
char *q = foo (p, r);
if (q != NULL)
{
if (strcmp (q, "string1/abcdestring2fg"))
abort ();
free (q);
}
return 0;
}
/* { dg-final { scan-tree-dump-times "strlen \\(" 2 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "memcpy \\(" 5 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "strcpy \\(" 0 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "strcat \\(" 0 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen1" } } */
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