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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - CheckAdd/Mul should have commutativity optimizations in B3->Air lowering"
href="https://bugs.webkit.org/show_bug.cgi?id=151214#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - CheckAdd/Mul should have commutativity optimizations in B3->Air lowering"
href="https://bugs.webkit.org/show_bug.cgi?id=151214">bug 151214</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>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</pre>
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