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...jan_10/harvest/source/14/14157FE8.shtml Somehow gcc3 sees these but everyone else including gcc4 fails. 6. Here llvm-gcc and gcc, but not clang, exploit undefinedness of integer overflow to eliminate most of the code in a function: http://embed.cs.utah.edu/embarrassing/jan_10/harvest/source/82/82A5CC31.shtml Most likely this is not what the authors of the code intended, but the compilers are correct. 7. Cute elimination of useless varargs code: http://embed.cs.utah.edu/embarrassing/jan_10/harvest/source/3A/3A235937.shtml John

...> > Somehow gcc3 sees these but everyone else including gcc4 fails. > > 6. > > Here llvm-gcc and gcc, but not clang, exploit undefinedness of integer > overflow to eliminate most of the code in a function: > > http://embed.cs.utah.edu/embarrassing/jan_10/harvest/source/82/82A5CC31.shtml > > Most likely this is not what the authors of the code intended, but the > compilers are correct. LLVM doesn't handle correlated expressions at the moment. -Eli