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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - At an OSR exit, FTL should select from all legal exit origins based on which one involves the least live state"
href="https://bugs.webkit.org/show_bug.cgi?id=152160#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - At an OSR exit, FTL should select from all legal exit origins based on which one involves the least live state"
href="https://bugs.webkit.org/show_bug.cgi?id=152160">bug 152160</a>
from <span class="vcard"><a class="email" href="mailto:fpizlo@apple.com" title="Filip Pizlo <fpizlo@apple.com>"> <span class="fn">Filip Pizlo</span></a>
</span></b>
<pre>To address <a class="bz_bug_link
bz_status_NEW "
title="NEW - B3 should strength-reduce the shifting madness that happens in asm.js memory accesses"
href="show_bug.cgi?id=152106">https://bugs.webkit.org/show_bug.cgi?id=152106</a>, 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.</pre>
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