Viewing file:  builtin-arith-overflow-1.c (3.51 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2 -fdump-tree-optimized -g" } */
/* SUB_OVERFLOW should be folded into unsigned subtraction,
because ovf is never used. */
__attribute__((noinline, noclone)) int
fn1 (int x, unsigned int y)
{
int res;
int ovf = __builtin_sub_overflow (x, y, &res);
int res2 = res;
int res3 = res2 - 2;
(void) ovf;
return res;
}
/* MUL_OVERFLOW should be folded into unsigned multiplication,
because ovf is never used. */
__attribute__((noinline, noclone)) int
fn2 (signed char x, long int y)
{
short int res;
int ovf = __builtin_mul_overflow (x, y, &res);
int res2 = res;
int res3 = res2 - 2;
(void) ovf;
return res;
}
#if __SIZEOF_INT__ > __SIZEOF_SHORT__ && __SIZEOF_INT__ > 1
/* ADD_OVERFLOW should be folded into unsigned addition,
because it never overflows. */
__attribute__((noinline, noclone)) int
fn3 (signed char x, unsigned short y, int *ovf)
{
int res;
*ovf = __builtin_add_overflow (x, y, &res);
return res;
}
#endif
/* MUL_OVERFLOW should be folded into unsigned multiplication,
because it never overflows. */
__attribute__((noinline, noclone)) long int
fn4 (long int x, long int y, int *ovf)
{
long int res;
x &= 65535;
y = (y & 65535) - 32768;
*ovf = __builtin_mul_overflow (x, y, &res);
return res;
}
#if __SIZEOF_INT__ > 1
/* MUL_OVERFLOW should be folded into unsigned multiplication,
because it always overflows. */
__attribute__((noinline, noclone)) signed char
fn5 (long int x, long int y, int *ovf)
{
signed char res;
x = (x & 63) + (__SCHAR_MAX__ / 4);
y = (y & 3) + 5;
*ovf = __builtin_mul_overflow (x, y, &res);
return res;
}
#endif
/* ADD_OVERFLOW should be folded into unsigned additrion,
because it never overflows. */
__attribute__((noinline, noclone)) unsigned char
fn6 (unsigned char x, unsigned char y, int *ovf)
{
unsigned char res;
x = (x & 63) + ((unsigned char) ~0 - 66);
y = (y & 3);
*ovf = __builtin_add_overflow (x, y, &res);
return res;
}
/* ADD_OVERFLOW should be folded into unsigned additrion,
because it always overflows. */
__attribute__((noinline, noclone)) unsigned char
fn7 (unsigned char x, unsigned char y, int *ovf)
{
unsigned char res;
x = (x & 15) + ((unsigned char) ~0 - 15);
y = (y & 3) + 16;
*ovf = __builtin_add_overflow (x, y, &res);
return res;
}
int
main ()
{
int ovf;
if (fn1 (-10, __INT_MAX__) != (int) (-10U - __INT_MAX__)
|| fn2 (0, 0) != 0
|| fn2 (32, 16383) != (short int) 524256ULL)
__builtin_abort ();
#if __SIZEOF_INT__ > __SIZEOF_SHORT__ && __SIZEOF_INT__ > 1
if (fn3 (__SCHAR_MAX__, (unsigned short) ~0, &ovf) != (int) (__SCHAR_MAX__ + (unsigned short) ~0)
|| ovf
|| fn3 (-__SCHAR_MAX__ - 1, 0, &ovf) != (int) (-__SCHAR_MAX__ - 1)
|| ovf)
__builtin_abort ();
#endif
if (fn4 (65535, 0, &ovf) != 65535L * -32768 || ovf)
__builtin_abort ();
#if __SIZEOF_INT__ > 1
if (fn5 (0, 0, &ovf) != (signed char) (__SCHAR_MAX__ / 4 * 5)
|| !ovf
|| fn5 (63, 3, &ovf) != (signed char) ((__SCHAR_MAX__ / 4 + 63) * 8)
|| !ovf)
__builtin_abort ();
#endif
if (fn6 (0, 0, &ovf) != (unsigned char) ~0 - 66
|| ovf
|| fn6 (63, 3, &ovf) != (unsigned char) ~0
|| ovf)
__builtin_abort ();
if (fn7 (0, 0, &ovf) != 0
|| !ovf
|| fn7 (63, 3, &ovf) != 18
|| !ovf)
__builtin_abort ();
return 0;
}
/* { dg-final { scan-tree-dump-not "ADD_OVERFLOW" "optimized" } } */
/* { dg-final { scan-tree-dump-not "SUB_OVERFLOW" "optimized" } } */
/* { dg-final { scan-tree-dump-not "MUL_OVERFLOW" "optimized" } } */
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