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__asm inline selective disable optimization

Ben S

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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  • 0 in reply to Mike Kleshov

    Thanks for the great suggestions.
    #pragma O0 (letter O, zero) did fix it.

    I would like to learn how to do an separate asm function call.
    I have been doing a little searching and haven't found any good examples how to call a function in a separate asm file from C. I've looked in the dissassembly and its pretty easy to pass the variable back through R0. I just don't know what the file header or other steps to take to make it work.

    Thanks,
    Ben

Reply
  • 0 in reply to Mike Kleshov

    Thanks for the great suggestions.
    #pragma O0 (letter O, zero) did fix it.

    I would like to learn how to do an separate asm function call.
    I have been doing a little searching and haven't found any good examples how to call a function in a separate asm file from C. I've looked in the dissassembly and its pretty easy to pass the variable back through R0. I just don't know what the file header or other steps to take to make it work.

    Thanks,
    Ben

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