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TMS320F28335: C2000 C++ Compiler: Is there a way to have the compiler optimize out the reference variable, i..e just replace it with the variable being referenced?

stevenh
Guru 20035 points
Part Number: TMS320F28335
Other Parts Discussed in Thread: C2000WARE

Hello,

Is there a way to get the C++ compiler to optimize out the reference variable, i..e  just replace it with the variable being referenced?

Setting the optimization level to 4 and size vs speed tradeoff to 0 doesn't didn't cause the compiler to optimize out the reference.  Please see simple program and map file output below.

Thanks,
Stephen

Example:

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/**
* main.c
*/
int efg = 0;
int &abc = efg;
int hij;
int main(void)
{
hij = abc;
return 0;
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

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1 0000d000 _abc
0 00009056 _abort
0 00009000 _c_int00
0 0000907f _copy_in
1 0000c00a _efg
0 00009058 _exit
1 0000c00b _hij
0 000090d1 _main
0 000090a3 _memcpy
abs ffffffff binit
0 00008000 cinit
0 000090db etext
abs ffffffff pinit
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  • 0
    TI__Guru**** 244470 points

    Build with the newer ABI setting --abi=eabi.  Then the compiler automatically gets rid of abc.  

    This may not be a practical solution.  You can use EABI only if all the other software you use (C2000Ware, etc.) is also built for EABI.

    Thanks and regards,

    -George

  • 0 in reply to George Mock
    Guru 20035 points

    Thanks.  I found out it also requires a certain minimum compiler version.

  • 0 in reply to George Mock
    Guru 20035 points

    I am using sys/bios (6.46.6.0), compiler version 21.12.0.STS and xdctools_3_31_03_43.

    I received the following error when I tried to compile my project with --abi=eabi.  Is this error caused by setting --abi=eabi or an issue with a compiler/syssbios/xdc version issue?

    js: "./config.bld", line 10: Error: Can't find the target named 'ti.targets.elf.C28_float' along the path 'C:/ti/bios_6_46_06_00/packages;C:/ti/ccs930/ccs/ccs_base;C:/ti/xdctools_3_31_03_43_core/packages;..;': please check the spelling of the target's name and that it exists along this path.
    xdctools_3_31_03_43_core\gmake.exe: *** No rule to make target `.configuro'. Stop.
    js: "C:/ti/xdctools_3_31_03_43_core/packages/xdc/tools/Cmdr.xs", line 51: Error: xdc.tools.configuro: configuration failed due to earlier errors (status = 2); 'linker.cmd' deleted.
    gmake[2]: *** [build-21490655-inproc] Error 1
    makefile:345: recipe for target 'all' failed
    gmake[1]: *** No rule to make target 'build-21490655', needed by 'configPkg/compiler.opt'. Stop.
    gmake: *** [all] Error 2

  • 0 in reply to George Mock
    Guru 20035 points

    It seems to be an issue with compiling sys/bios/xdc with eabi. 

    How can I correct this issue?

  • +1 in reply to stevenh
    TI__Guru**** 161575 points

    Steven,

    I think you are going to be out of luck.  I do not believe TI-RTOS / XDCTools for 28x have support for EABI.

    Regards,

    John