Bug 152106

Summary: B3 should strength-reduce the shifting madness that happens in asm.js memory accesses
Product: WebKit Reporter: Filip Pizlo <fpizlo>
Component: JavaScriptCoreAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal    
Priority: P2    
Version: WebKit Nightly Build   
Hardware: All   
OS: All   
Bug Depends on: 152160, 152162, 152163, 150777, 152164    
Bug Blocks: 154319    

Description Filip Pizlo 2015-12-09 22:09:24 PST
We end up emitting the left-shift and the right-shift.  It's pretty bad.
Comment 1 Filip Pizlo 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.