On Sat, Apr 30, 2016 at 12:28:35PM -0700, Chris Hanson wrote: > On Apr 30, 2016, at 11:43 AM, Diane Bruce <d...@db.net> wrote: > > > > We cannot use the same outdated ideas we used to use for 'C' > > that we used 40 years ago today. Compilers have improved. > > Know your tools. And that's all I have said. > > In support of this, I’d encourage everyone who works with C to read Chris > Lattner’s “What Every C Programmer Should Know About Undefined Behavior” > series from the LLVM blog: > > http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html > http://blog.llvm.org/2011/05/what-every-c-programmer-should-know_14.html > http://blog.llvm.org/2011/05/what-every-c-programmer-should-know_21.html
Yes, it's an excellent series. > > C has fairly well-defined semantics, they just aren’t necessarily what you > think they are, and optimizers are taking advantage of them (under the “as > if” rule) such that a developer’s idea of what assembly a specific section of > C code should generate is not all that accurate these days. > Indeed. > -- Chris > > Diane -- - d...@freebsd.org d...@db.net http://www.db.net/~db
