On Aug 12, 2015, at 11:07 AM, Jeff Law <l...@redhat.com> wrote: > On 08/12/2015 11:12 AM, Richard Biener wrote: >> >> Prec is almost never a constant and is heavily used from wide-int. >> >> We are not exploiting this undefined ness in C so I object to making this so >> much slower. >> >> Can we instead do what we do for abs_hwi and add a checking assert so we can >> move the tests to the callers that misbehave instead? > Given that ISO C++ is moving away from making shifting 1 into the sign bit > undefined behaviour, maybe we should make UBSan less strict in its warning. > That may eliminate the need for Mikael's patch.
Pedantically, then, we have to move the the later language standard (if this was standardese). If it was DRese, then we’re safe. :-)
