Am Mon, 21 Sep 2015 19:32:21 +0000 schrieb Ola Fosheim Grøstad <ola.fosheim.grostad+dl...@gmail.com>:
> On Monday, 21 September 2015 at 18:28:19 UTC, jmh530 wrote: > > My understanding is that the key benefit of Rust's system is > > that compile time checks don't have the runtime costs of smart > > pointers. > > + aliasing information. > > If the compiler can prove that two pointers point to > non-overlapping memory regions then the compiler can optimize > better. This is one of the reasons why Fortran compilers managed > to do better than C for a long time. > Unfortunately we have even weaker optimizations than C regarding aliasing information. There's code in druntime and phobos which breaks C aliasing rules (usually pointer type casts) and this caused real issues on ARM systems with GDC. As the D spec doesn't state anything about aliasing we simply disable strict aliasing rules. I guess there's also lots of D user code which isn't compatible with strict aliasing rules.
