B3 should strength-reduce the shifting madness that happens in asm.js memory accesses 
https://bugs.webkit.org/show_bug.cgi?id=152106
Summary B3 should strength-reduce the shifting madness that happens in asm.js memory ...
Filip Pizlo
Reported 2015-12-09 22:09:24 PST
We end up emitting the left-shift and the right-shift. It's pretty bad.
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Filip Pizlo
Comment 1 2015-12-10 18:48:14 PST
I think that I know how to do this without doing anything asm.js-specific. I think that my general approach will benefit a lot of coding styles. It's going to be done by implementing a bunch of different optimizations. Each one is cheap. I'll file bugs for the individual optimizations and relate them to this one.
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