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    who ever heard of a deterministic computer anyway? Commented Aug 9, 2011 at 19:16
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    as litb's excellent answer programmers.stackexchange.com/a/99741/192238 indicates, the title and body of this question seem a little bit mismatched: "behaviors open for compilers to implement in their own way" are usually referred to as implementation-defined. sure, actual UB is allowed to be defined by the implementation author, but more often than not, they don't bother (and optimise it all away, etc.) Commented Feb 26, 2016 at 1:50
  • Something similar to this softwareengineering.stackexchange.com/questions/398703/… Commented Sep 22, 2019 at 17:51