Saturating integer arithmetic

[Ola Fosheim Grøstad via Digitalmars-d]

On Sunday, 26 June 2016 at 13:59:03 UTC, Andrei Alexandrescu 
wrote:
> On 6/26/16 9:47 AM, Manu via Digitalmars-d wrote:
>> Hi people. I've been working on this colour library when I 
>> have free
>> time (almost never!), and I want to work on blending/filtering
>> functions, but that work is kinda blocked by saturating 
>> arithmetic
>> logic.
>> I started working on a saturating integer library a few times, 
>> but
>> it's much a much bigger job than it appears, and I haven't had 
>> enough
>> time for it. (Efficient) implementation tends to be 
>> significantly
>> different for every int width and signed/unsigned. I see no 
>> use for an
>> inefficient implementation used by a colour library; images 
>> tend to be
>> millions of pixels, and inefficiency very quickly adds up.
>
> See the recent thread "DbI checked integral". Saturation is a 
> direct goal, and you should be able to optimize operations for 
> each type by defining relatively small hooks.

No, saturated operations are typically SIMD instructions.