[PATCH] D79615: [X86] Teach getUndefRegClearance that we use undef for inputs to PUNPCK in some cases.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon accepted this revision.
RKSimon added a comment.
This revision is now accepted and ready to land.

LGTM - just a query about non-VEX PACKSS/PACKUS cases



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Comment at: llvm/lib/Target/X86/X86InstrInfo.cpp:4895
   case X86::PACKSSDWrr:
   case X86::PACKUSDWrr:
   case X86::VPACKSSWBrr:
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Does the non-VEX PACKSS/PACKUS need pulling out as well since Op1 is tied? I don't know if we have examples of this though.


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https://reviews.llvm.org/D79615