diff options
Diffstat (limited to 'internal.h')
| -rw-r--r-- | internal.h | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/internal.h b/internal.h index e74b91f667..eebd31073c 100644 --- a/internal.h +++ b/internal.h @@ -96,15 +96,41 @@ extern "C" { #endif #define TIMET_MAX_PLUS_ONE (2*(double)(TIMET_MAX/2+1)) +#ifdef HAVE_BUILTIN___BUILTIN_MUL_OVERFLOW_P +#define MUL_OVERFLOW_P(a, b) \ + __builtin_mul_overflow_p((a), (b), (__typeof__(a * b))0) +#elif defined HAVE_BUILTIN___BUILTIN_MUL_OVERFLOW +#define MUL_OVERFLOW_P(a, b) \ + ({__typeof__(a) c; __builtin_mul_overflow((a), (b), &c);}) +#endif + #define MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, min, max) ( \ (a) == 0 ? 0 : \ (a) == -1 ? (b) < -(max) : \ (a) > 0 ? \ ((b) > 0 ? (max) / (a) < (b) : (min) / (a) > (b)) : \ ((b) > 0 ? (min) / (a) < (b) : (max) / (a) > (b))) + +#ifdef HAVE_BUILTIN___BUILTIN_MUL_OVERFLOW_P +/* __builtin_mul_overflow_p can take bitfield */ +/* and GCC permits bitfields for integers other than int */ +#define MUL_OVERFLOW_FIXNUM_P(a, b) ({ \ + struct { SIGNED_VALUE fixnum : SIZEOF_VALUE * CHAR_BIT - 1; } c; \ + __builtin_mul_overflow_p((a), (b), c.fixnum); \ +}) +#else #define MUL_OVERFLOW_FIXNUM_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, FIXNUM_MIN, FIXNUM_MAX) -#define MUL_OVERFLOW_LONG_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, LONG_MIN, LONG_MAX) -#define MUL_OVERFLOW_INT_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, INT_MIN, INT_MAX) +#endif + +#ifdef MUL_OVERFLOW_P +#define MUL_OVERFLOW_LONG_LONG_P(a, b) MUL_OVERFLOW_P(a, b) +#define MUL_OVERFLOW_LONG_P(a, b) MUL_OVERFLOW_P(a, b) +#define MUL_OVERFLOW_INT_P(a, b) MUL_OVERFLOW_P(a, b) +#else +#define MUL_OVERFLOW_LONG_LONG_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, LONG_LONG_MIN, LONG_LONG_MAX) +#define MUL_OVERFLOW_LONG_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, LONG_MIN, LONG_MAX) +#define MUL_OVERFLOW_INT_P(a, b) MUL_OVERFLOW_SIGNED_INTEGER_P(a, b, INT_MIN, INT_MAX) +#endif #ifndef swap16 # ifdef HAVE_BUILTIN___BUILTIN_BSWAP16 |