.CC suffix

What does .CC suffix attached to a register mean? For instance, IADD R35.CC, R35, 0x1. I didn’t find it documented, so I am curious what it does. Thanks!

CC means the instruction uses a condition code register

The exact usage/behavior may vary by instruction. But, for example, it can carry information used for extended precision arithmetic:

[url]PTX ISA :: CUDA Toolkit Documentation

For extended-precision adds, the CC register carries carry/borrow information that is used by the add instruction, representing carry-in or borrow-out from the previous operation.