Viewing file:  builtin-arith-overflow-2.c (3.11 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* { dg-do run } */
/* { dg-options "-O2 -fdump-tree-optimized" } */
/* MUL_OVERFLOW should not be folded into unsigned multiplication,
because it sometimes overflows and sometimes does not. */
__attribute__((noinline, noclone)) long int
fn1 (long int x, long int y, int *ovf)
{
long int res;
x &= 65535;
y = (y & 65535) - (__LONG_MAX__ / 65535 + 32768);
*ovf = __builtin_mul_overflow (x, y, &res);
return res;
}
/* MUL_OVERFLOW should not be folded into unsigned multiplication,
because it sometimes overflows and sometimes does not. */
__attribute__((noinline, noclone)) signed char
fn2 (long int x, long int y, int *ovf)
{
signed char res;
x = (x & 63) + (__SCHAR_MAX__ / 4);
y = (y & 3) + 4;
*ovf = __builtin_mul_overflow (x, y, &res);
return res;
}
/* ADD_OVERFLOW should be folded into unsigned additrion,
because it sometimes overflows and sometimes does not. */
__attribute__((noinline, noclone)) unsigned char
fn3 (unsigned char x, unsigned char y, int *ovf)
{
unsigned char res;
x = (x & 63) + ((unsigned char) ~0 - 65);
y = (y & 3);
*ovf = __builtin_add_overflow (x, y, &res);
return res;
}
/* ADD_OVERFLOW should be folded into unsigned additrion,
because it sometimes overflows and sometimes does not. */
__attribute__((noinline, noclone)) unsigned char
fn4 (unsigned char x, unsigned char y, int *ovf)
{
unsigned char res;
x = (x & 15) + ((unsigned char) ~0 - 16);
y = (y & 3) + 16;
*ovf = __builtin_add_overflow (x, y, &res);
return res;
}
/* MUL_OVERFLOW should not be folded into unsigned multiplication,
because it sometimes overflows and sometimes does not. */
__attribute__((noinline, noclone)) long int
fn5 (long int x, unsigned long int y, int *ovf)
{
long int res;
y = -65536UL + (y & 65535);
*ovf = __builtin_mul_overflow (x, y, &res);
return res;
}
int
main ()
{
int ovf;
if (fn1 (0, 0, &ovf) != 0
|| ovf
|| fn1 (65535, 0, &ovf) != (long int) ((__LONG_MAX__ / 65535 + 32768UL) * -65535UL)
|| !ovf)
__builtin_abort ();
if (fn2 (0, 0, &ovf) != (signed char) (__SCHAR_MAX__ / 4 * 4U)
|| ovf
|| fn2 (0, 1, &ovf) != (signed char) (__SCHAR_MAX__ / 4 * 5U)
|| !ovf)
__builtin_abort ();
if (fn3 (0, 0, &ovf) != (unsigned char) ~0 - 65
|| ovf
|| fn3 (63, 2, &ovf) != (unsigned char) ~0
|| ovf
|| fn3 (62, 3, &ovf) != (unsigned char) ~0
|| ovf
|| fn3 (63, 3, &ovf) != 0
|| !ovf)
__builtin_abort ();
if (fn4 (0, 0, &ovf) != (unsigned char) ~0
|| ovf
|| fn4 (1, 0, &ovf) != 0
|| !ovf
|| fn4 (0, 1, &ovf) != 0
|| !ovf
|| fn4 (63, 3, &ovf) != 17
|| !ovf)
__builtin_abort ();
if (fn5 (0, 0, &ovf) != 0
|| ovf
|| fn5 (1, 0, &ovf) != -65536L
|| !ovf
|| fn5 (2, 32768, &ovf) != -65536L
|| !ovf
|| fn5 (4, 32768 + 16384 + 8192, &ovf) != -32768L
|| !ovf)
__builtin_abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "ADD_OVERFLOW" 2 "optimized" } } */
/* { dg-final { scan-tree-dump-times "SUB_OVERFLOW" 0 "optimized" } } */
/* { dg-final { scan-tree-dump-times "MUL_OVERFLOW" 3 "optimized" } } */
|
