On 09/20/2016 04:51 PM, Scott Hess wrote:
No patch suggested, though I wouldn't be surprised if my brain makes a
suggestion after things simmer for an hour or so. If either value
needs less than 31 bits, it can't happen, but there's not a simple bit
pattern to check, AFAICT.
Unless performance is of uttermost importance, just try and see if it
fails or not.
prod = x * y;
if (y != 0) {
if (prod / y != x) {
/* Overflow. */
}
}
This also works for multiplications such as 1152921504606846976 * 3,
which do not overflow, but have much bigger multiplicands.
--
Bernardo Sulzbach
http://www.mafagafogigante.org/
mafagafogiga...@mafagafogigante.org
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