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.
jeff
