[PATCH] D48225: [llvm-mca][X86] Teach how to identify register writes that implicitly clear the upper portion of a super-register.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

So as it is now, writing a VR128X with XOP will zero [511:256] and [255:128], but writing VR256X with xop won't?


https://reviews.llvm.org/D48225