r192331 - Use KEY_WOW64_32KEY when reading the registry in WindowsToolChain.cpp (PR17033)

[Warren Hunt]

System resources such as registers.  64-bit mode gives you 16 registers
where as 32-bit mode only gives you 8.  Typically performance is better by
~5% in 64-bit mode.

-Warren


On Thu, Oct 10, 2013 at 6:13 AM, Aaron Ballman <aaron at aaronballman.com>wrote:

> On Thu, Oct 10, 2013 at 4:57 AM, Yaron Keren <yaron.keren at gmail.com>
> wrote:
> > Hi Hans,
> >
> > This looks good to me.
> >
> > What is the advantage of building clang.exe as a 64-bit app?
>
> 64-bit applications can take advantage of system resources better than
> 32-bit applications can, when running natively.
>
> ~Aaron
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