Perfomance uses are pretty pointless now, as I discovered ten years ago when I found that gcc could turn masked shifts into a native rotate. So for multiply or

Perfomance uses are pretty pointless now, as I discovered ten years ago when I found that gcc could turn masked shifts into a native rotate. So for multiply or divide just do so. Obviously where the underlying ops are xor etc, you use them. Most of the time I find myself using the for masking flags in system calls nowdays though and similar.