Comment #8 on issue 2513 by [email protected]: life benchmark slowness
http://code.google.com/p/v8/issues/detail?id=2513
It shouldn't be too hard to optimize (a<b)|0 to avoid any branching; | (and
all the other bitwise operators) perform ToInt32 on their inputs.
Propagating this "result flows into ToInt32" information from uses to defs,
it is then simple to optimize a comparison that flows into ToInt32 to
emit "cmp; setcc". Indeed, I assume Crankshaft must already be doing
something similar, e.g., to avoid the overflow check in an integer addition
that flows into |0; IonMonkey certainly does.
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