tiny.simd.allEqual

1/// Returns whether every lane of `input` equals `value`, as2/// `std.mem.allEqual` does. Whole vectors compare with the broadcast value,3/// and the last vector overlaps lanes already compared. A span shorter than4/// a vector compares lane by lane.5pub fn allEqual(comptime D: type, input: []const D.Lane, value: D.Lane) bool {6    if (input.len < D.lane_count) {7        for (input) |lane| {8            if (lane != value) return false;9        }10        return true;11    }12    const broadcast: D.Vector = @splat(value);13    const last = input.len - D.lane_count;14    var index: usize = 0;15    while (index < last) : (index += D.lane_count) {16        const lanes: D.Vector = input[index..][0..D.lane_count].*;17        if (@reduce(.Or, lanes != broadcast)) return false;18    }19    std.debug.assert(index >= last);20    std.debug.assert(index - last < D.lane_count);21    const lanes: D.Vector = input[last..][0..D.lane_count].*;22    return !@reduce(.Or, lanes != broadcast);23}

1pub const allEqual = algo.allEqual;