Viewing file:  strlenopt-19.c (1.8 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2 -fdump-tree-strlen" } */
#include "strlenopt.h"
__attribute__((noinline, noclone)) char *
fn1 (int x, int y, int z)
{
static char buf[40];
const char *p;
switch (x)
{
case 0:
p = "abcd";
/* Prevent cswitch optimization. */
asm volatile ("" : : : "memory");
break;
case 1:
p = "efgh";
break;
case 2:
p = "ijkl";
break;
default:
p = "mnop";
break;
}
if (y)
{
strcpy (buf, p);
if (z)
strcat (buf, "ABCDEFG");
else
strcat (buf, "HIJKLMN");
}
else
{
strcpy (buf, p + 1);
if (z)
strcat (buf, "OPQ");
else
strcat (buf, "RST");
}
return buf;
}
int
main ()
{
int i;
for (i = 0; i < 5; i++)
{
const char *p = "abcdefghijklmnop" + (i < 3 ? i : 3) * 4;
const char *q;
fn1 (i ? 0 : 1, 1, 1);
q = fn1 (i, 0, 0);
if (memcmp (q, p + 1, 3) != 0 || memcmp (q + 3, "RST", 4) != 0)
abort ();
fn1 (i ? 0 : 1, 0, 1);
q = fn1 (i, 1, 0);
if (memcmp (q, p, 4) != 0 || memcmp (q + 4, "HIJKLMN", 8) != 0)
abort ();
fn1 (i ? 0 : 1, 1, 0);
q = fn1 (i, 0, 1);
if (memcmp (q, p + 1, 3) != 0 || memcmp (q + 3, "OPQ", 4) != 0)
abort ();
fn1 (i ? 0 : 1, 0, 0);
q = fn1 (i, 1, 1);
if (memcmp (q, p, 4) != 0 || memcmp (q + 4, "ABCDEFG", 8) != 0)
abort ();
}
return 0;
}
/* { dg-final { scan-tree-dump-times "strlen \\(" 0 "strlen1" } } */
/* { dg-final { scan-tree-dump-times "memcpy \\(" 6 "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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