"Chris Jefferson" <[EMAIL PROTECTED]> writes: > One thing which comes up regularly in various C and C++ messageboards > is that statements like "f() + g()" and "a(f(), g())" do not declare > which order f() and g() will be executed in. > > How hard would it be to fix the order of execution in gcc/g++? Could > someone point me to the piece of code which must change, or if it is > only a very small change, the actual change required? I would very > much like to be able to benchmark this, as I can find no previous case > where someone has tried fixing the order of execution to see if it > actually makes any measureable difference.
It would be a bit tedious but not especially difficult. My idea would be to rewrite c = a + b into t1 = a; t2 = b; c = t1 + t2. Of course this rewriting could be skipped where a and b are constants or simple variables. This would be done in the frontend. In fact you could do this rewriting outside of the compiler in a source-to-source transformation tool. > Would anyone be interested in this being added as a command line argument? No. We should only create a variant language for a good reason. This is not a good reason. Ian
