tree
fold_const_call (built_in_function fn, tree type, tree arg0, tree arg1,
tree arg2)
{
const char *p0, *p1;
size_t s2;
switch (fn)
{
case BUILT_IN_STRNCMP:
if ((p0 = c_getstr (arg0))
&& (p1 = c_getstr (arg1))
&& host_size_t_cst_p (arg2, &s2))
return build_int_cst (type, strncmp (p0, p1, s2));
return NULL_TREE;
case BUILT_IN_BCMP:
case BUILT_IN_MEMCMP:
if ((p0 = c_getstr (arg0))
&& (p1 = c_getstr (arg1))
&& host_size_t_cst_p (arg2, &s2)
&& s2 <= strlen (p0)
&& s2 <= strlen (p1))
return build_cmp_result (type, memcmp (p0, p1, s2));
return NULL_TREE;
default:
return fold_const_call_1 (fn, type, arg0, arg1, arg2);
}
}
tree
fold_const_call (combined_fn fn, tree type, tree arg0, tree arg1, tree arg2)
{
const char *p0, *p1;
char c;
unsigned HOST_WIDE_INT s0, s1;
size_t s2 = 0;
switch (fn)
{
case CFN_BUILT_IN_STRNCMP:
if (!host_size_t_cst_p (arg2, &s2))
return NULL_TREE;
if (s2 == 0
&& !TREE_SIDE_EFFECTS (arg0)
&& !TREE_SIDE_EFFECTS (arg1))
return build_int_cst (type, 0);
else if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1)))
return build_int_cst (type, strncmp (p0, p1, s2));
return NULL_TREE;
case CFN_BUILT_IN_STRNCASECMP:
if (!host_size_t_cst_p (arg2, &s2))
return NULL_TREE;
if (s2 == 0
&& !TREE_SIDE_EFFECTS (arg0)
&& !TREE_SIDE_EFFECTS (arg1))
return build_int_cst (type, 0);
else if ((p0 = c_getstr (arg0))
&& (p1 = c_getstr (arg1))
&& strncmp (p0, p1, s2) == 0)
return build_int_cst (type, 0);
return NULL_TREE;
case CFN_BUILT_IN_BCMP:
case CFN_BUILT_IN_MEMCMP:
if (!host_size_t_cst_p (arg2, &s2))
return NULL_TREE;
if (s2 == 0
&& !TREE_SIDE_EFFECTS (arg0)
&& !TREE_SIDE_EFFECTS (arg1))
return build_int_cst (type, 0);
if ((p0 = c_getstr (arg0, &s0))
&& (p1 = c_getstr (arg1, &s1))
&& s2 <= s0
&& s2 <= s1)
return build_cmp_result (type, memcmp (p0, p1, s2));
return NULL_TREE;
case CFN_BUILT_IN_MEMCHR:
if (!host_size_t_cst_p (arg2, &s2))
return NULL_TREE;
if (s2 == 0
&& !TREE_SIDE_EFFECTS (arg0)
&& !TREE_SIDE_EFFECTS (arg1))
return build_int_cst (type, 0);
if ((p0 = c_getstr (arg0, &s0))
&& s2 <= s0
&& target_char_cst_p (arg1, &c))
{
const char *r = (const char *) memchr (p0, c, s2);
if (r == NULL)
return build_int_cst (type, 0);
return fold_convert (type,
fold_build_pointer_plus_hwi (arg0, r - p0));
}
return NULL_TREE;
default:
return fold_const_call_1 (fn, type, arg0, arg1, arg2);
}
}
