Where is std::num::Saturating? (Going to pre-RFC!)

[mbrubeck]

We currently have overflowing_add and overflowing_sub for access to the carry bit. See this thread for related discussion:

Adding access to the carry flag bit

I've often lamented that most compilers do not expose the carry bit, detecting overflow/underflow and rotate through carry instructions... I think that the performance of numerous programs can be significantly enhanced by the addition of instructions that operate on the carry flag. The tricky bit... The actual condition is easy, but for anyone not familiar with most cpu implementations, the carry flag is a flag set only by various instructions, usually, add, sub, cmp, rcr/rcl (rotate right/…