Viewing file:  strlenopt-15.c (1.6 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2 -fdump-tree-strlen" } */
#include "strlenopt.h"
__attribute__((noinline, noclone)) size_t
fn1 (char *p, size_t l)
{
memcpy (p, "abcdef", l);
/* This strlen can't be optimized, as l is unknown. */
return strlen (p);
}
__attribute__((noinline, noclone)) size_t
fn2 (char *p, const char *q, size_t *lp)
{
size_t l = strlen (q), l2;
memcpy (p, q, 7);
/* This strlen can't be optimized, as l might be bigger than 7. */
l2 = strlen (p);
*lp = l;
return l2;
}
__attribute__((noinline, noclone)) char *
fn3 (char *p)
{
*p = 0;
return p + 1;
}
int
main ()
{
char buf[64];
const char *volatile q = "ABCDEFGH";
const char *volatile q2 = "IJ\0KLMNOPQRS";
size_t l;
memset (buf, '\0', sizeof buf);
memset (buf + 2, 'a', 7);
if (fn1 (buf, 3) != 9 || memcmp (buf, "abcaaaaaa", 10) != 0)
abort ();
if (fn1 (buf, 7) != 6 || memcmp (buf, "abcdef\0aa", 10) != 0)
abort ();
if (fn2 (buf, q, &l) != 9 || l != 8 || memcmp (buf, "ABCDEFGaa", 10) != 0)
abort ();
if (fn2 (buf, q2, &l) != 2 || l != 2 || memcmp (buf, "IJ\0KLMNaa", 10) != 0)
abort ();
if (fn3 (buf) != buf + 1 || memcmp (buf, "\0J\0KLMNaa", 10) != 0)
abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "memcpy \\(" 2 "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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