30 Apr
2016
30 Apr
'16
12:28 p.m.
On Apr 30, 2016, at 11:43 AM, Diane Bruce <db at 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We cannot use the same outdated ideas we used to use for 'C'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
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.
-- Chris