[PATCH] D78486: [SystemZ] Expand vector zero-extend into a shuffle.

[Jonas Paulsson via Phabricator via llvm-commits]

jonpa marked an inline comment as done.
jonpa added inline comments.


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Comment at: llvm/lib/Target/SystemZ/SystemZISelLowering.cpp:5262
+    Mask[MaskElt] = PackedElt;
+  }
+  SDValue Shuf = DAG.getVectorShuffle(InVT, DL, PackedOp, ZeroVec, Mask);
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I rewrote this loop from the version on Apr 20 2020, 14:06, so that the indexes into the zero vector would be not just the first byte, but increasing. Back then that lead to some matches of MERGE_HIGH, but I see now that it's a no-op, given the optimization of the zero vector we have now added. But i suppose, it doesn't matter much either way...


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https://reviews.llvm.org/D78486