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Debug build works but release

Yu Qiao
Note: This was originally posted on 19th January 2010 at http://forums.arm.com

My code works on debug build ( -Otime -g+ )
But release build can't work (  -Otime -O2 -zo )
the code is the same. the compiler is ADS1.2

Do you guys have any idea or previous experience on such an issue?

Thanks.
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  • Arm Employee Badge
    Note: This was originally posted on 19th January 2010 at http://forums.arm.com

    When in debug mode the compiler probably turns off some of the more advanced optimizations to make the debug view more sensible. If you code is not compliant to the C standard it may work at low optimization levels, but will then break when the optimizer makes assumptions about the code which should be true but are not. Either that or it is a compiler bug =P

    Can you post information about what actually goes wrong, and what the disassembly looks like for the relevant pieces of code from both version you built?

    Iso
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  • Arm Employee Badge
    Note: This was originally posted on 19th January 2010 at http://forums.arm.com

    When in debug mode the compiler probably turns off some of the more advanced optimizations to make the debug view more sensible. If you code is not compliant to the C standard it may work at low optimization levels, but will then break when the optimizer makes assumptions about the code which should be true but are not. Either that or it is a compiler bug =P

    Can you post information about what actually goes wrong, and what the disassembly looks like for the relevant pieces of code from both version you built?

    Iso
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