Subject: bug#2790: emacs 22.1.1 cannot open 5GB file on
64GB 64-bit GNU/Linux box
Stefan Monnier <monnier@xxxxxxxxxxxxxxxx> writes:
> I do not know what you're referring to. If you're referring to the fact
> that (((EMACS_INT)st.st_size)*4) may overflow, then I'm not sure what
> problem you're envisaging:
The compiler can (and does) optimize on the fact that overflow does not
occur, thus the operation x*4/4 becomes a no-op. Never ever do overflow
checking after the fact.
Andreas Schwab, schwab@xxxxxxxxxxxxxx
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."