87C0
ICLASS:     XCHG
CATEGORY:   DATAXFER
EXTENSION:  BASE
IFORM:      XCHG_GPRv_GPRv
ISA_SET:    I86
ATTRIBUTES: SCALABLE 
SHORT:      xchg eax, eax
Encodable! 90
Discrepenacy after re-encoding. dec_len= 2 [87C0] enc_olen= 1 [90] for instruction: XCHG XCHG_GPRv_GPRv EASZ:2, EOSZ:2, HAS_MODRM:1, LZCNT, MAX_BYTES:2, MOD:3, MODE:1, MODRM_BYTE:192, NOMINAL_OPCODE:135, OUTREG:EAX, P4, POS_MODRM:1, REG0:EAX, REG1:EAX, SMODE:1, TZCNT
0		REG0/RW/V/EXPLICIT/NT_LOOKUP_FN/GPRV_B
1		REG1/RW/V/EXPLICIT/NT_LOOKUP_FN/GPRV_R
YDIS: xchg eax, eax
vs Encode  request: XCHG EASZ:2, EOSZ:2, HAS_MODRM:1, LZCNT, MAX_BYTES:2, MOD:3, MODE:1, MODRM_BYTE:192, NOMINAL_OPCODE:135, OUTREG:EAX, P4, POS_MODRM:1, REG0:EAX, REG1:EAX, SMODE:1, TZCNT
OPERAND ORDER: REG0 REG1