About Arudino zero (ARMV6-M) assembly principle

Official Hardware Classic Zero
1

I know that PC jumps can be implemented using the B, BL, and BX instructions, such as

B loop_start ; jump to the loop_start label,

or `

BX LR ; return from a subroutine

But I also learned that PC jumps can also be realized using the MOV PC instruction, for example

; Calculate the destination address and store it in R0
MOV PC, R0 ; Jump to the address in R0

`
I want to know when the compiler generates the first B, BL, BX instructions? And when does it generate the MOV PC instruction?

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