Comment #9 on issue 3907 by [email protected]: Allowing asm.js memory
growth causes big slowdown
https://code.google.com/p/v8/issues/detail?id=3907
+1 to "use asm" including a version number.
TurboFan doesn't do validation of asm.js code at all. Instead it just
applies general optimizations, and one of them is the constness of the
closure bindings. "changeHeap" makes those array bindings mutable, so
TurboFan compiles in the generic case, making access to the heap go through
an IC, which is slow.
We've considered just detecting the mutable array bindings in the specific
cases of asm modules and falling back to Crankshaft until TurboFan does
better speculative optimizations. That solution is kind of ugly and would
have to be ported back to 41 (and now 42). A version number would make that
work unnecessary, since TurboFan would simply not trigger for the new
version.
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