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Interesting. On which CPU did you measure the 12% gain ? On x86_64, it is 1% slower which is better than I thought. |
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I just enabled 64 bit nan boxing with 47 bit pointers so that it works on most targets. I also reduced the memory usage of JSObject properties. |
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Proposal for a 64 bits NaN boxing on 64 bits platforms, using the existing mecanism for 32 bits platforms.
Minimal change with a hard limit at 44 bits pointer value, but offers +12% average performance improvement over benchmarks\v8