simd, cmd/compile: add 8-bit interleave operations on amd64 Add InterleaveLo and InterleaveHi for Int8x16 and Uint8x16, and add InterleaveLoGrouped and InterleaveHiGrouped for Int8x32, Int8x64, Uint8x32, and Uint8x64 on amd64. Lower them to VPUNPCKLBW and VPUNPCKHBW, respectively, and add coverage for signed and unsigned vectors. Change-Id: I5bf45e9b318890181ef376876251e31e1512bc98 Reviewed-on: https://go-review.googlesource.com/c/go/+/796340 Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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