Decoding BLX instruction on ARM/Thumb (IOS)

Question

I've read through much of the ARM documentation but still having trouble decoding a BLX instruction. Here are two examples:

__text:0000347C 02 F0 B2 ED                 BLX             _objc_msgSend

__text:0000469C 01 F0 A2 EC                 BLX             _objc_msgSend

Both of these are supposed to go to the same place, virtual address 0x5FE4 as seen here:

__symbolstub1:00005FE4 38 F0 9F E5                 LDR             PC, =__imp__objc_msgSend

However, I can't figure out what calculation is used to get from the above two addresses (0x347C and 0x469C) using their instruction bytes. According to the ARM documentation its supposed to be a relative jump, using a right shift by 2, but the numbers don't work out.

Can anyone help out?