Boris Zbarsky a écrit :
On 2/1/13 10:52 AM, Jean-Marc Desperrier wrote:
The trouble with going 64-bits is that the jit would then see some
significant regression, for cache pressure/instruction set related
reasons
Do you have numbers here?
I'm aware of some regressions for things that involve traversing DOM
trees in a microbenchmark with 64-bit builds, but not for the JIT per
se. Well, apart from us having focused a bit more on 32-bit JIT perf
than 64-bit JIT perf, I guess.
I was just repeating what I had understood you and Mandelin were saying
in October 2011 and last July :-)
Rereading it more carefully, you were actually saying it needed tests,
and could not be assumed to be either faster or slower, becomes some
part could be faster, but some other also slower (for the reasons above).
I realize now what caused back then the 64-bits option to be axed was
probably more the concerns about binary compatibility.
However today, breaking binary compatibility with third-party tools
might be seen as more advantageous than a problem :-)
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