t...@gmplib.org (Torbjörn Granlund) writes: > I assume "undefined" means that the computer will not explode, or even > cause any less dramatic security issues, or even terminate execution.
I think a typical operation with "undefined" meaning is dereferencing a NULL pointer. Which on most current systems will terminate execution. A system where left shift can crash seems a bit more unlikely. But I guess it's conceivable with a processor and C compiler featuring an "arithmetic left shift" instruction which traps on signed overflow. Which would be compliant with the C standard. Bit it's surprising to me too that also non-overflowing left shift of negative values is undefined. So it seems generally unsafe to use shift on signed types, except possibly for constants. /Niels -- Niels Möller. PGP-encrypted email is preferred. Keyid 368C6677. Internet email is subject to wholesale government surveillance. _______________________________________________ gmp-devel mailing list gmp-devel@gmplib.org https://gmplib.org/mailman/listinfo/gmp-devel