cmd/compile, simd/archsimd: add SVE float ReduceSum Float32s.ReduceSum and Float64s.ReduceSum return the sum of all elements, as the spec's ReduceSum. They lower to FADDV under an all-true predicate, which leaves the sum in the scalar register Go returns a float in, so no move follows: x.ReduceSum() // x Float32s PWHILELT R1, R0, P0.S // all true ZFADDVS Z0.S, P0, V0 FADDV adds the lanes in pairwise tree order, so a float result can differ from a left-to-right sum by rounding. Change-Id: If9497ed5fab19e42e9a24a549abf7484aa6c45fc Reviewed-on: https://go-review.googlesource.com/c/go/+/848032 Auto-Submit: David Chase <drchase@google.com> Reviewed-by: Junyang Shao <shaojunyang@google.com> Auto-Submit: Junyang Shao <shaojunyang@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com>
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