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1. asm <-> opcodes

   $ echo "0x28 0x46" | llvm-mc --disassemble -triple=thumbv7
       .text
       mov r0, r5
   
   $ echo "mov r0, r5" | llvm-mc -assemble -triple=thumbv7 -show-encoding
       .text
       mov r0, r5                  @ encoding: [0x28,0x46]
   
   $ echo "movs r0, 0x1" | llvm-mc -assemble -triple=thumbv7 -show-encoding
       .text
       movs    r0, #1                  @ encoding: [0x01,0x20]
   

   See also iOS binary patching: http://www.zdziarski.com/blog/?p=2172