VEX_B
if (!(vex_byte1 & VEX_B))
if (r_m != NULL && ((VEX_B & vex_byte1) == 0))
if ((VEX_B & evex_byte1) == 0) {
if ((evex_byte1 & VEX_B) == 0)
vex_byte1 = (opcode3 & VEX_R) | VEX_X | VEX_B;
vex_B = (opcode3 & VEX_B) >> 1;
vex_byte1 = opcode3 & (VEX_R | VEX_X | VEX_B);