cmd/compile, simd/archsimd: add SVE mask All m.All() reports whether every lane of m is active. It is a flag-setting BICS of all-true AND NOT m, then a test of Z: PWHILELT R2, R1, P0.H // all true PBICS P1.B, P0.B, P0.Z, P0.B CSET EQ, R0 The all-true predicate is at the mask's element size, so the bits between the lanes of a wider mask are ignored. Change-Id: Ic3e7d5c0f0bffbb0f745c29c4e91f5e57ad7140f Reviewed-on: https://go-review.googlesource.com/c/go/+/838949 Reviewed-by: Junyang Shao <shaojunyang@google.com> Reviewed-by: David Chase <drchase@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>
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