Viewing file:  strlenopt-59.c (2.03 KB) -rw-r--r--
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/* Verify that strlen() calls with constant conditional expressions are
eliminated as expected.
{ dg-do compile }
{ dg-options "-O1 -fdump-tree-optimized" } */
extern void abort (void);
extern __SIZE_TYPE__ strlen (const char*);
#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)
/* Macros to emit a call to funcation named
call_failed_to_be_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 ELIM(expr) \
if ((expr)) FAIL (test_not_eliminated); else (void)0
extern char a3[3];
extern char a7[7];
struct MemArrays { char a[7], b[9]; };
struct MemArrays ma;
void test_elim_condexpr (int i)
{
ELIM (6 < strlen (i ? "" : "123456"));
ELIM (6 < strlen (i ? "123456" : ""));
ELIM (4 < strlen (i < 1 ? "a" : i == 1 ? "ab" : "abc"));
ELIM (3 < strlen (i ? "" : a3));
ELIM (3 < strlen (i ? a3 : "1"));
ELIM (6 < strlen (i ? "12" : a7));
ELIM (6 < strlen (i ? a7 : "123"));
ELIM (6 < strlen (i ? "1234" : a7));
ELIM (7 < strlen (i ? a7 : "1234567"));
ELIM (3 < strlen (i < 1 ? "a" : i == 1 ? "ab" : a3));
ELIM (3 < strlen (i < 1 ? "a" : i == 1 ? a3 : "abc"));
ELIM (3 < strlen (i < 1 ? a3 : i == 1 ? "a" : "abc"));
ELIM (6 < strlen (i < 1 ? "a" : i == 1 ? "ab" : a7));
ELIM (6 < strlen (i < 1 ? "a" : i == 1 ? a7 : "abc"));
ELIM (6 < strlen (i < 1 ? a7 : i == 1 ? "a" : "abc"));
ELIM (6 < strlen (i < 1 ? "a" : i == 1 ? a7 : a3));
ELIM (6 < strlen (i < 1 ? a7 : i == 1 ? "a" : a3));
{
enum { maxlen = sizeof ma - 1 };
ELIM (maxlen < strlen (ma.a));
}
{
enum { maxlen = sizeof ma - __builtin_offsetof (struct MemArrays, b) - 1 };
ELIM (maxlen < strlen (ma.b));
}
}
/* { dg-final { scan-tree-dump-times "test_not_eliminated_" 0 "optimized" } } */
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