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Taking address of a near variable

Ralf Goebel
Genius 3715 points


Hello,

I have some problems using the address of a near variable and doing some arithmetic with it.
Example:

near int Value;
unsigned int test()
{
    unsigned int addr = (unsigned int)&Value;
    addr += (1 << 28);
    return addr;
}

When using the ELF format for C66x I get an assembly warning:

[W0001]
         Value out of range; converted to 0
               MVK     .S1     $DPR_byte(Value)+268435456,A3 ; |175|

When using the COFF format for C64x I get no warning, but the linker hangs in a loop.

This problem only occurs with optimizations turn on. I get the same result with CG Tools v7.3.8 and v7.4.6.

Thanks,
Ralf

  • 0
    TI__Guru**** 251010 points

    Thank you for bringing this to our attention.  This is some sort of bug in the compiler tools.  The compiler should never generate code which the assembler doesn't like.  I can reproduce the problem.  I filed SDSCM00049545 in the SDOWP system to have this investigated.  Feel free to follow it with the SDOWP link below in my signature.  

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Genius 3715 points

    Hi George,

    thanks for your quick answer.
    I think that the volatile keyword can be used as a workaround in the meantime:

    unsigned int test()
    {
        volatile unsigned int addr = (unsigned int)&Value;
        addr += (1 << 28);
        return addr;
    }

    Ralf