This function intentionally overflows the signed range on
the left shift. Using this type-punning avoids errors from
the overflow checker without disabling this test globally.
Signed-off-by: Mans Rullgard <mans@mansr.com>
#ifndef sign_extend
static inline av_const int sign_extend(int val, unsigned bits)
{
- return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits);
+ unsigned shift = 8 * sizeof(int) - bits;
+ union { unsigned u; int s; } v = { (unsigned) val << shift };
+ return v.s >> shift;
}
#endif