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CX51 using EMOV instruction on non- MX cored device

I'm currently running a SiLabs C8051F336 processor using the CX51 compiler. I'm getting and illegal op-code (A5-the EMOV instruction) when I compile the following line:

*string = map_char_to_index(*string, font);

this get compiled as

        ; SOURCE LINE # 77
001E AD00        R     MOV     R5,font
0020 120000      R     LCALL   _map_char_to_index
0023 AB00        R     MOV     R3,string
0025 AA00        R     MOV     R2,string+01H
0027 A900        R     MOV     R1,string+02H
0029 EF                MOV     A,R7
002A A558              EMOV    @PR0,A


Any ideas as to why that instruction is implemented on a non MX core, and non Phillips device? How do I disable it?

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