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__asm inline selective disable optimization

Hi,
I'm an mixing assembly with C code using Keil uV 4.6
When I have optimization Level 3 (-O3) turned on, the compiler skips alot of assembly function memory reads & writes. I need every line to be executed for this particular function.

 __asm
    {
        MOV r1,#0x0041000
        MOV r2,#0x0040000
        ...
    }


I have tried intrinsic commands like __nop(), __force_store(), __schedule_barrier, etc, and have tried to make variables volatile. I know i must be missing something...
Any suggestions

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