On 23/01/15 08:56, Lars-Peter Clausen wrote:
> On 01/23/2015 12:09 AM, Rasmus Villemoes wrote:
>> The line above makes vel a 12-bit quantity (st->rx[] is u8). The
>> intention is to sign-extend vel using bit 11 as the sign bit. But
>> because of C's promotion rules "vel = (vel << 4) >> 4;" is actua
On 01/23/2015 12:09 AM, Rasmus Villemoes wrote:
The line above makes vel a 12-bit quantity (st->rx[] is u8). The
intention is to sign-extend vel using bit 11 as the sign bit. But
because of C's promotion rules "vel = (vel << 4) >> 4;" is actually a
no-op, since vel is promoted to int before the i
The line above makes vel a 12-bit quantity (st->rx[] is u8). The
intention is to sign-extend vel using bit 11 as the sign bit. But
because of C's promotion rules "vel = (vel << 4) >> 4;" is actually a
no-op, since vel is promoted to int before the inner
shift. sign_extend32 works equally well for 8
