Viewing file:  strlenopt-4.c (2.21 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2 -fdump-tree-strlen" } */
#include "strlenopt.h"
/* If stpcpy can't be used, this is optimized into
strcpy (p, q); strcat (p, r); memcpy (p + strlen (p), "abcd", 5);
If stpcpy can be used (see strlenopt-4g.c test),
this is optimized into
memcpy (stpcpy (stpcpy (p, q), r), "abcd", 5); */
__attribute__((noinline, noclone)) void
foo (char *p, const char *q, const char *r)
{
strcpy (p, q);
strcat (p, r);
strcat (p, "abcd");
}
/* If stpcpy can't be used, this is optimized into
memcpy (p, "abcd", 4); strcpy (p + 4, q); strcat (p, r);
If stpcpy can be used, this is optimized into
memcpy (p, "abcd", 4); strcpy (stpcpy (p + 4, q), r); */
__attribute__((noinline, noclone)) void
bar (char *p, const char *q, const char *r)
{
strcpy (p, "abcd");
strcat (p, q);
strcat (p, r);
}
/* If stpcpy can't be used, this is optimized into
strcat (p, q); memcpy (t1 = p + strlen (p), "abcd", 4);
strcpy (t1 + 4, r); memcpy (p + strlen (p), "efgh", 5);
If stpcpy can be used, this is optimized into
t1 = stpcpy (p + strlen (p), q); memcpy (t1, "abcd", 4);
memcpy (stpcpy (t1 + 4, r), "efgh", 5); */
__attribute__((noinline, noclone)) void
baz (char *p, const char *q, const char *r)
{
strcat (p, q);
strcat (p, "abcd");
strcat (p, r);
strcat (p, "efgh");
}
char buf[64];
int
main ()
{
char *volatile p = buf;
const char *volatile q = "ij";
const char *volatile r = "klmno";
foo (p, q, r);
if (memcmp (buf, "ijklmnoabcd\0\0\0\0\0\0\0\0", 20) != 0)
abort ();
memset (buf, '\0', sizeof buf);
bar (p, q, r);
if (memcmp (buf, "abcdijklmno\0\0\0\0\0\0\0\0", 20) != 0)
abort ();
memset (buf, 'v', 3);
memset (buf + 3, '\0', -3 + sizeof buf);
baz (p, q, r);
if (memcmp (buf, "vvvijabcdklmnoefgh\0", 20) != 0)
abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "memcpy \\(" 4 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "strcpy \\(" 3 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "strcat \\(" 3 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "strchr \\(" 0 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "stpcpy \\(" 0 "strlen1" } } */
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