Viewing file:  strlenopt-11.c (2.65 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2 -fdump-tree-strlen" } */
#include "strlenopt.h"
__attribute__((noinline, noclone)) void
fn1 (char *p, const char *z, size_t *lp)
{
char *q, *r, *s;
char buf[64];
size_t l[11];
/* The first strlen stays, all the strcpy calls can be optimized
into memcpy and most other strlen calls and all strchr calls
optimized away. l[6] = strlen (r); and l[9] = strlen (r); need
to stay, because we need to invalidate the knowledge about
r strlen after strcpy (q, "jklmnopqrst"). */
l[0] = strlen (z);
strcpy (buf, z);
strcpy (p, "abcde");
q = strchr (p, '\0');
strcpy (q, "efghi");
r = strchr (q, '\0');
strcpy (r, buf);
l[1] = strlen (p);
l[2] = strlen (q);
l[3] = strlen (r);
strcpy (q, "jklmnopqrst");
l[4] = strlen (p);
l[5] = strlen (q);
l[6] = strlen (r);
s = strchr (q, '\0');
strcpy (s, buf);
l[7] = strlen (p);
l[8] = strlen (q);
l[9] = strlen (r);
l[10] = strlen (s);
memcpy (lp, l, sizeof l);
}
int
main ()
{
char buf[64];
size_t l[11];
const char *volatile z = "ABCDEFG";
memset (buf, '\0', sizeof buf);
fn1 (buf, z, l);
if (memcmp (buf, "abcdejklmnopqrstABCDEFG", 24) != 0)
abort ();
if (l[0] != 7)
abort ();
if (l[1] != 17 || l[2] != 12 || l[3] != 7)
abort ();
if (l[4] != 16 || l[5] != 11 || l[6] != 6)
abort ();
if (l[7] != 23 || l[8] != 18 || l[9] != 13 || l[10] != 7)
abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "strlen \\(" 3 "strlen1" } } */
/* avr has BIGGEST_ALIGNMENT 8, allowing fold_builtin_memory_op
to expand the memcpy call at the end of fn1. */
/* { dg-final { scan-tree-dump-times "memcpy \\(" 7 "strlen1" { target { ! avr-*-* } } } } */
/* { dg-final { scan-tree-dump-times "memcpy \\(" 6 "strlen1" { target { avr-*-* } } } } */
/* { 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" } } */
/* Where the memcpy is expanded, the assignemts to elements of l are
propagated. */
/* { dg-final { scan-tree-dump-times " _\[0-9\]* = strlen \\(\[^\n\r\]*;\[\n\r\]* l.0. = " 1 "strlen1" { target { ! avr-*-* } } } } */
/* { dg-final { scan-tree-dump-times " _\[0-9\]* = strlen \\(\[^\n\r\]*;\[\n\r\]* l.6. = " 1 "strlen1" { target { ! avr-*-* } } } } */
/* { dg-final { scan-tree-dump-times " _\[0-9\]* = strlen \\(\[^\n\r\]*;\[\n\r\]* l.9. = " 1 "strlen1" { target { ! avr-*-* } } } } */
/* { dg-final { scan-tree-dump-times " _\[0-9\]* = strlen \\(\[^\n\r\]*;" 3 "strlen1" { target { avr-*-* } } } } */
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