tiny.simd.satWidenMulPairwiseAdd

1pub fn satWidenMulPairwiseAdd(comptime DW: type, a: anytype, b: anytype) DW.Vector {2    if (comptime DW.Lane != i16 or sourceLane(@TypeOf(a)) != u8 or sourceLane(@TypeOf(b)) != i8 or3        sourceLaneCount(@TypeOf(a)) != DW.lane_count * 2 or4        sourceLaneCount(@TypeOf(b)) != DW.lane_count * 2)5    {6        @compileError("satWidenMulPairwiseAdd requires paired u8 and i8 sources with i16 output");7    }8    var result: DW.Vector = undefined;9    inline for (0..DW.lane_count) |index| {10        const sum = @as(i32, a[index * 2]) * @as(i32, b[index * 2]) +11            @as(i32, a[index * 2 + 1]) * @as(i32, b[index * 2 + 1]);12        result[index] = @intCast(std.math.clamp(sum, std.math.minInt(i16), std.math.maxInt(i16)));13    }14    return result;15}

1pub const satWidenMulPairwiseAdd = multiply.satWidenMulPairwiseAdd;