it is impossible to convert ASM to LLVM IR to ASM for deobf

[fr0zenrain]

convert asm to IR ,and finally compile IR with O2 to asm for deobfuscation,it is impossible?

i test a simple demo,but failed!

MCDirector: Using Triple: arm-unknown-unknown
MCDirector: Using CPU: generic
MCDirector: Using Features: +v6
Triple: arm-unknown-unknown
CPU: generic
Debug+Asserts/bin/fracture-cl> dec 0x4ec4
BB#0: derived from LLVM BB %"func_4ec4+0"
%R3<def,tied3> = STRD_POST %R11, %R12, %R3, %R0, 1024, pred:11, pred:%CPSR; mem:ST4 dbg::20164
%R10 = ANDrsi %R1, %R2, 226, pred:9, pred:%CPSR, opt:%noreg; dbg::20168
%R11<def,tied1> = STMDA_UPD %R11, pred:4, pred:%CPSR, %R4, %R5, %SP, %LR; mem:ST4 dbg::20172
%R4, %PC<def,tied2> = LDRBT_POST_IMM %PC, %noreg, 155445, pred:4, pred:%CPSR; mem:LD4 dbg::20176
LLVM ERROR: Cannot select: 0x7fc6ca80d8e0: i32,i32,ch = LDRBT_POST_IMM 0x7fc6ca80d7d0:1, 0x7fc6ca80d4a0, 0x7fc6ca80d5b0, 0x7fc6ca80d6c0, 0x7fc6ca80c6c0, 0x7fc6ca80d7d0<Mem:LD4> [ID=45] dbg::20176
0x7fc6ca80d4a0: i32,ch = CopyFromReg 0x7fc6ca80d280, 0x7fc6ca80d390 [ID=42] dbg::20176
0x7fc6ca80d390: i32 = Register %PC [ID=19]
0x7fc6ca80d5b0: f32,ch = CopyFromReg 0x7fc6ca80d4a0:1, 0x7fc6ca80c060 [ID=43] dbg::20176
0x7fc6ca80c060: f32 = Register %noreg [ID=12]
0x7fc6ca80d6c0: i32 = Constant<155445> [ID=20]
0x7fc6ca80c6c0: i32 = Constant<4> [ID=14]
0x7fc6ca80d7d0: i32,ch = CopyFromReg 0x7fc6ca80d5b0:1, 0x7fc6ca80a4a0 [ID=44] dbg::20176
0x7fc6ca80a4a0: i32 = Register %CPSR [ID=7]
In function: func_4ec4