What's the meaning of W suffix for thumb-2 instruction?

Question

There is a w suffix for thumb-2 instruction as below, how does it change the semantic of the instruction without it? The search result is very noisy and I didn\'t get the an

Answer 1

I see ADDW in Cortex-M3 TRM Table 2-5

Data operations with large immediate
ADDW and SUBW have a 12-bit immediate. This means they can replace many from memory literal loads.

It is also mentioned in Quick Reference

add wide T2 ADD Rd, Rn, #

Looks like the assembler would recognize the immediate constant <= 12 bits, and do the needful.

In the context where you see it, it is an ordinary "add".