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Optimization Problem With Data Conversion


Our HDF5 software has been having some data conversion problem with GCC's optimization for a few years. One example is to convert data from short to int. You can find the program at

ftp://ftp.hdfgroup.uiuc.edu/pub/outgoing/slu/tmp/ctest.c

When I use "gcc -O2" or "gcc -O3" to compile it, I get wrong values after the conversion. When I use "gcc -O0" or "gcc -O1", the values are correct.

I'll greatly appreciate your help if you can have a look at it.

Ray


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