Viewing file:  strlenopt-77.c (1.83 KB) -rw-r--r--
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/* PR tree-optimization/91315 - missing strlen lower bound of a string
known to be at least N characters
{ dg-do compile }
{ dg-options "-O2 -Wall -fdump-tree-optimized" } */
#include "strlenopt.h"
#define CAT(x, y) x ## y
#define CONCAT(x, y) CAT (x, y)
#define FAILNAME(name) CONCAT (call_ ## name ##_on_line_, __LINE__)
#define FAIL(name) do { \
extern void FAILNAME (name) (void); \
FAILNAME (name)(); \
} while (0)
/* Macro to emit a call to function named
call_in_true_branch_not_eliminated_on_line_NNN()
for each call that's expected to be eliminated. The dg-final
scan-tree-dump-time directive at the bottom of the test verifies
that no such call appears in output. */
#define ASSERT_ELIM(expr) \
if (!!(expr)) FAIL (in_true_branch_not_eliminated); else (void)0
char a[32];
void lower_bound_assign_1 (void)
{
a[0] = '1';
ASSERT_ELIM (strlen (a) < 1);
}
void lower_bound_assign_2 (void)
{
a[0] = '1';
a[1] = '2';
ASSERT_ELIM (strlen (a) < 2);
}
void lower_bound_assign_3 (void)
{
a[0] = '1';
a[1] = '2';
a[2] = '3';
ASSERT_ELIM (strlen (a) < 3);
}
void lower_bound_memcpy (void)
{
memcpy (a, "123", 3);
ASSERT_ELIM (strlen (a) < 3);
}
void lower_bound_memcpy_memcpy_2 (void)
{
memcpy (a, "123", 3);
memcpy (a + 2, "345", 3);
ASSERT_ELIM (strlen (a) < 5);
}
void lower_bound_memcpy_memcpy_3 (void)
{
memcpy (a, "123", 3);
memcpy (a + 3, "456", 3);
ASSERT_ELIM (strlen (a) < 6);
}
/* FIXME: Not optimized yet.
void lower_bound_stpcpy_stpcpy_assign (void)
{
*stpcpy (strcpy (a, "123"), "4567") = '8';
ASSERT_ELIM (strlen (a) < 8);
}
*/
void lower_bound_strcpy_strcat_assign (void)
{
strcpy (a, "123");
strcat (a, "45");
a[5] = '6';
ASSERT_ELIM (strlen (a) < 6);
}
/* { dg-final { scan-tree-dump-times "call_in_true_branch_not_eliminated_" 0 "optimized" } } */
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