Category "sign-extension"

What do the `uxtx` and `sxtx` extensions mean for 32-bit AArch64 `adds` instruction?

I'm looking at the following disassembled AArch64 instruction: 65 6E 20 2B adds w5, w19, w0, uxtx #3 According to the ARM manual, uxtx zero-extends w0 to an