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Author serhiy.storchaka
Recipients barry, serhiy.storchaka, vstinner
Date 2019-09-22.09:47:06
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Py_UNREACHABLE is used to indicate that a specific point in the program cannot be reached, even if the compiler might otherwise think it can. This is exact the case for __builtin_unreachable in GCC and Clang. I propose to extend Py_UNREACHABLE() to __builtin_unreachable() in the release mode. This will allow the compiler to generate more efficient code.

If there are circumstances in which Py_UNREACHABLE() is reachable, then it is improper use of Py_UNREACHABLE(). It should be replaced with raising an appropriate exception (like TypeError, ValueError, RuntimeError or SystemError) or, in extreme cases, with explicit Py_FatalError()
Date User Action Args
2019-09-22 09:47:06serhiy.storchakasetrecipients: + serhiy.storchaka, barry, vstinner
2019-09-22 09:47:06serhiy.storchakasetmessageid: <>
2019-09-22 09:47:06serhiy.storchakalinkissue38249 messages
2019-09-22 09:47:06serhiy.storchakacreate