[ARM] Clarification on one of the ARM instruction

[mjuneja]

For the below given instruction

LDMNEIA R10!,{R9,R3 - R5}

While copying the data from location specified in R10 to R3, it will check for NE condition between R10 and R3.

Then in the similar manner, while copying the data from location specified in R10+4 to R4, it will check for NE condition between R10+4 and R4.

Doubt 1: is my understanding correct about the mentioned instruction ?

Doubt 2: If correct, that means there exist a possibility that the copying operation can stop at any stage if the given condition is not satisfied and some of the location can go uncopied.

Please clarify.

 

[FvM]

I believe your understanding of the conditional LDM instruction is wrong. NE checks the Z flag which has been set in a previous instruction. There's no compare performed during LDM execution. The condition is tested once at the instruction begin.