Viewing file:  strlenopt-5.c (1.31 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, const char *q)
{
char *e = strchr (p, '\0');
strcat (p, q);
return e;
}
__attribute__((noinline, noclone)) char *
bar (char *p)
{
memcpy (p, "abcd", 5);
return strchr (p, '\0');
}
__attribute__((noinline, noclone)) void
baz (char *p)
{
char *e = strchr (p, '\0');
strcat (e, "abcd");
}
char buf[64];
int
main ()
{
char *volatile p = buf;
const char *volatile q = "ij";
memset (buf, 'v', 3);
if (foo (p, q) != buf + 3
|| memcmp (buf, "vvvij\0\0\0\0", 10) != 0)
abort ();
memset (buf, '\0', sizeof buf);
if (bar (p) != buf + 4
|| memcmp (buf, "abcd\0\0\0\0\0", 10) != 0)
abort ();
memset (buf, 'v', 2);
memset (buf + 2, '\0', -2 + sizeof buf);
baz (p);
if (memcmp (buf, "vvabcd\0\0\0", 10) != 0)
abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "strlen \\(" 2 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "memcpy \\(" 2 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "strcpy \\(" 1 "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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