[PATCH] D132784: [AArch64][TTI] Add cost table entry for trunc over vector of integers.

[Dave Green via Phabricator via llvm-commits]

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

The new values LGTM. Thanks.



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Comment at: llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp:1611
+    // FIXME: v4i64 -> v4i8 should be optimized to 1 uzp1 + 1 xtn
+    {ISD::TRUNCATE, MVT::v4i8, MVT::v4i64, 3},
+    {ISD::TRUNCATE, MVT::v4i16, MVT::v4i32, 1},   // xtn
----------------
It looks like it is already 2 here: https://godbolt.org/z/T4rTqf1Tx. I guess it is not very reliable at the moment.


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  https://reviews.llvm.org/D132784/new/

https://reviews.llvm.org/D132784