[PATCH] D133700: [PowerPC] Exploit xxperm, check for dead vectors and substitute vperm with xxperm

[Amy Kwan via Phabricator via llvm-commits]

amyk added inline comments.


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Comment at: llvm/lib/Target/PowerPC/PPCISelLowering.cpp:10209
+
+    // if V2 is dead, then we swap vV1 and V2 so we can
+    // use V2 as the destination instead.
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amyk wrote:
> Can we elaborate why we want V2 as the destination?
Thanks for bringing this up with me again. 
I think I misunderstood or read this incorrectly at the time, so you can probably disregard the comment regarding the elaboration. 


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https://reviews.llvm.org/D133700