[webkit-dev] arm jit
oliver at apple.com
Wed Jun 10 14:33:12 PDT 2009
The issue is that it compiling 5000 lines of libraries (possibly more)
results in a significant amount of memory use, that's why we don't
compile -- i don't believe there was a significant cpu time
performance win (if any at all) from delaying function compilation.
There was however a significant memory win for most pages the user
On Jun 10, 2009, at 2:20 PM, Toshiyasu Morita wrote:
> --- On Wed, 6/10/09, Oliver Hunt <oliver at apple.com> wrote:
> > I doubt that eager compilation would be a good strategy for the
> web, though,
> > since web pages tend to load very large libraries of functions,
> while only calling a
> > small percentage of those functions.
> Turbo C compiled about 10,000 lines of source code per second on an
> ancient 12 Mhz PC AT. It does register allocation, common
> subexpression elimination, and a bunch of other classical compiler
> Most modern processors are from about 200 Mhz to about 3 Ghz, which
> is significantly faster than a PC AT. If you use simple linear
> extrapolation, that's a compile speed of about 160k-2m lines per
> second. That seems adequate to compile even fairly large libraries
> of functions.
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