[Webkit-unassigned] [Bug 152160] At an OSR exit, FTL should select from all legal exit origins based on which one involves the least live state

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=152160

--- Comment #1 from Filip Pizlo <fpizlo at apple.com> ---
To address https://bugs.webkit.org/show_bug.cgi?id=152106, we want to ensure that if we have:

a: BitRShift(@address, 2)
b: CheckInBounds(@address, @length)

Then we usually exit to before @a, since @b is likely to require both @address and @a to be live while @a won't need itself. Unless @address dies at @a, @a will have one fewer live things than @b.

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