[Webkit-unassigned] [Bug 151214] CheckAdd/Mul should have commutativity optimizations in B3->Air lowering

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=151214

--- Comment #2 from Filip Pizlo <fpizlo at apple.com> ---
While doing this and talking to Ben, I realized that we need to have the notion of a LateUse: a Use that happens after all relevant Def's, i.e. it appears like it's a Use on the instruction following this one.  We need this to handle:

- CheckAdd(@x, @x)
- CheckMul(@x, @y) where the register allocator uses the same register for the result as for the inputs

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