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    Most language don't lend themselves well to this, because the compiler does not have information on whether or not the functions can interfere with each other if run in parallel. Functional languages that mark pure and impure functions would be best suited to this. However, I can't tell which compilers do this, if any. Commented Jan 31, 2021 at 13:51
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    There's some useful discussion (specifically in context of GCC) here. Commented Jan 31, 2021 at 15:23
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    Are we talking about concurrency or asynchronicity here? Concurrency forces the threads to run in parallel, asynchronicity does not enforce it but allows for it to happen if the runtime machine so chooses. Taking a simple example: the members of a rock band have to perform at the same time when playing live (= concurrency), but when recording a studio track, they're not required (but are allowed) to record their bits at the same time. However, the studio recording can only be released when they've all played their individual parts (= asynchronicity). Commented Feb 1, 2021 at 1:15
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    You normally have to tell a compiler to do so, and it is only a few that can. It is a much better idea to use a modern language that has parallelism supported directly and then code accordingly. (Java is an example). Perhaps even use a framework supporting spreading the load over multiple machines. Commented Feb 1, 2021 at 14:24
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    Not precisely what you looking for but I'd suggest taking a look at en.wikipedia.org/wiki/Automatic_parallelization. A cursory search shows that GCC, Oracle's Fortran compiler, and Intel's C++ compiler at least seem have some form of for loop auto-parallelization. Commented Feb 1, 2021 at 16:24