Date: Fri, 17 Jul 2015 21:38:55 +0200 From: Alex <alexinbeijing@...il.com> To: musl@...ts.openwall.com Subject: Re: Left-shift of negative number > Effectively, the C standard at the place that you cite doesn't define > a behavior for such shifts of negative values. But this doesn't mean > that a particular implementation of a C compiler or the C library > (here musl) can't define a behavior for that. The problem is that some (hypothetical) standards-compliant C compiler could define a behavior which isn't what musl intends. If such a compiler ever came into existence and was used to build musl, the resulting library could be subtly broken. But if no such compiler is known to actually exist right now, does anybody care? I don't know. Anyways, if the code can be adjusted to avoid the dreaded "undefined behavior", without losing any performance, it's probably better to do so. AD
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