On Wed, Jan 13, 2010 at 9:12 AM, Stephen White <senorbla...@chromium.org> wrote:
> 2) Most of the supposed performance advantage of strict aliasing rules is
> probably taken care of by memory disambiguation in modern (ie., Core2 and
> later) CPUs.
I kind of doubt that. Disallowing aliasing lets the compiler do
a number of high-level optimizations that the chip could never do on its own.
See e.g.
http://cellperformance.beyond3d.com/articles/2006/06/understanding-strict-aliasing.html
I'm for -fstrict-aliasing except for third_party.
- Dan
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