Compilation of BNE 1B Problems

(The following is a small issue I have posted about embedding assembler programs frequently used in ARM Linux learning)

When I read the Linux development manual (P95) Today, I encountered the following code:

1:

LDR R4, [R2], #4

STR R4, [R1], #4

CMP R1, r3

BNE 1b

From the previous knowledge, we can understand BNE 1. As for BNE 1B, it is really hard to understand it. I found an explanation for it on the Internet. Let's talk about it below:

In BNE, 1B is directed to the local tag 1 and executed. B Indicates backward.
BNE 1f (jump forward to partial tag 1 for execution)
Eg:

1:;
CMP r0, #0
Beq 1f; R0 = 0 then jump forward to B and execute
BNE 1B; otherwise, the system will jump back to a and execute
1:; B