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adding new variable causing systemC simulation to behave diffrently


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seeing this crazy behavior that when I add a 'double m_temp' variable to my class, I end up getting very different behavior where my sc_assert fires. This only happens when I set my optimization flag -O3 with g++. If I remove -O3 and add -g (for debug) to my g++ flag, I go back to my original behavior and everything passes. This doesn't look random, as I can reproduce it.

I ran it with valgrind and I don't see any memory leak.

==23030== LEAK SUMMARY:
==23030==    definitely lost: 0 bytes in 0 blocks
==23030==    indirectly lost: 0 bytes in 0 blocks
==23030==      possibly lost: 177,955 bytes in 592 blocks
==23030==    still reachable: 3,585,485 bytes in 2,563 blocks
==23030==         suppressed: 0 bytes in 0 blocks
==23030== For counts of detected and suppressed errors, rerun with: -v
==23030== Use --track-origins=yes to see where uninitialised values come from
==23030== ERROR SUMMARY: 25300 errors from 286 contexts (suppressed: 6 from 6)


Not sure what's going on. Any suggestions. Can't seem to run gdb/ddd since adding -g to g++ doesn't reproduce the behavior.


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Can you share the build command (i.e. g++ <options> <input file> -o <output file>) in Release build?

If you are using CMake you can generate build commands by running.

make VERBOSE=1

in case you are using the autotools you can give this command to show the build commands.

make V=1

For other tools you will have to look into documentation for getting the g++ build commands.

Kindly post the results here to analyze further.

Also if possible kindly share minimal code which reproduces this behavior.


Ameya Vikram Singh

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