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by peterfirefly
15 days ago
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flohofwoe (above) and aw1621107 (next to this post) both figured out that the magic ingredient isn't whether we code an if or add the boolean value of a comparison to the array size. The magic ingredient is whether the store is conditional or not. Having the compiler convert a conditional store to an unconditional store can have bad consequences if you have interrupts or task switches or SMP going on, so it's not a good idea to do it -- unless you can guarantee that the thread of execution the compiler can see is indeed the only one. Yeah, yeah, volatile and barriers etc... still, not a good idea. |
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