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A comment on Apple CPU tricks: memory reordering, JavaScript support, ref counting. Parent comment
It speeds up converting JavaScript doubles to 32-bit integers.
[1] is the Webkit commit that added support for FJCVTZS, it was between a 0.5 to 2% speedup - that's a big win for a mature optimizer.
[0] https://stackoverflow.com/a/50966903/
[1] https://bugs.webkit.org/show_bug.cgi?id=184023#c24
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It speeds up converting JavaScript doubles to 32-bit integers.
[1] is the Webkit commit that added support for FJCVTZS, it was between a 0.5 to 2% speedup - that's a big win for a mature optimizer.
[0] https://stackoverflow.com/a/50966903/
[1] https://bugs.webkit.org/show_bug.cgi?id=184023#c24