1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175

ix!();

use crate::{
    obxd_filter,
    Obxd24dBCoeff,
    ObxdParams,
    OBXD_SSEW,
};

impl crate::ObxdFilter {

    pub unsafe fn process_4_pole(qfu: &mut QuadFilterUnitState, sample: __m128) -> __m128 {

        let zero  = _mm_set1_ps(0.0);
        let one   = _mm_set1_ps(1.0);
        let two   = _mm_set1_ps(2.0);
        let three = _mm_set1_ps(3.0);

        let g24 = qfu.coeff[Obxd24dBCoeff::G24];
        let s1  = qfu.reg[ObxdParams::S1 as usize];

        let pole_mix_inv_int = qfu.coeff[Obxd24dBCoeff::PoleMixInvInt];
        let pole_mix_scaled  = qfu.coeff[Obxd24dBCoeff::PoleMixScaled];

        for i in 0..Obxd24dBCoeff::count() {
            qfu.coeff[i] = _mm_add_ps( qfu.coeff[i], qfu.dcoeff[i]);
        }

        // float lpc = qfu.coeff[g] / (1 + qfu.coeff[g]);
        let lpc: __m128 = _mm_div_ps(
            g24, 
            _mm_add_ps(one, g24)
        );

        // float y0 = NewtonRaphsonR24dB(sample,qfu.coeff[g],lpc);
        let y0: __m128 = obxd_filter::newton_raphson_r24_db(sample, lpc, qfu);

        // first lowpass in cascade
        // double v = (y0 - s1) * lpc;
        let v: __m128 = _mm_mul_ps(
            _mm_sub_ps(
                y0, 
                s1), 
            lpc);

        // double res = v + s1;
        let res: __m128 = _mm_add_ps( v, s1);

        // s1 = res + v;
        qfu.reg[ObxdParams::S1 as usize] = _mm_add_ps(res, v);

        // damping
        // qfu.reg[ObxdParams::S1 as usize] =atan(s1*rcor24)*Rcor24inv;
        let mut s1_rcor24: __m128 = _mm_mul_ps(
            qfu.reg[ObxdParams::S1 as usize], 
            qfu.coeff[Obxd24dBCoeff::Rcor24]);

        let mut s1_rcor24_arr = [0.0_f32; (OBXD_SSEW as usize)];

        _mm_store_ps(
            s1_rcor24_arr.as_mut_ptr(), 
            s1_rcor24);

        for idx in 0..OBXD_SSEW {
            let idx = idx as usize;

            if qfu.active[idx] != 0 {
                s1_rcor24_arr[idx] = (s1_rcor24_arr[idx]).atan();
            } else {
                s1_rcor24_arr[idx] = 0.0;
            }
        }

        s1_rcor24 = _mm_load_ps(s1_rcor24_arr.as_mut_ptr());

        qfu.reg[ObxdParams::S1 as usize] = _mm_mul_ps(
            s1_rcor24, 
            qfu.coeff[Obxd24dBCoeff::Rcor24inv]);

        let y1: __m128 = res;

        let y2: __m128 = obxd_filter::tptpc(
            &mut qfu.reg[ObxdParams::S2 as usize], 
            y1, 
            g24);

        let y3: __m128 = obxd_filter::tptpc(
            &mut qfu.reg[ObxdParams::S3 as usize], 
            y2, 
            g24);

        let y4: __m128 = obxd_filter::tptpc(
            &mut qfu.reg[ObxdParams::S4 as usize], 
            y3, 
            g24);

        let zero_val: __m128 = _mm_add_ps(
            _mm_mul_ps(
                _mm_sub_ps(
                    one, 
                    pole_mix_scaled), 
                y4), 
            _mm_add_ps(
                pole_mix_scaled, 
                y3));

        let zero_mask: __m128 = _mm_cmpeq_ps(
            pole_mix_inv_int, 
            zero);

        let one_mask: __m128 = _mm_cmpeq_ps(
            pole_mix_inv_int, 
            one);

        let one_val: __m128 = _mm_add_ps(
            _mm_mul_ps(
                _mm_sub_ps(
                    one, 
                    pole_mix_scaled), 
                y3), 
            _mm_mul_ps(
                pole_mix_scaled, 
                y2));

        let two_mask: __m128 = _mm_cmpeq_ps(
            pole_mix_inv_int, 
            two);

        let two_val: __m128 =_mm_add_ps(
            _mm_mul_ps(
                _mm_sub_ps(
                    one, 
                    pole_mix_scaled), 
                y2), 
            _mm_mul_ps(
                pole_mix_scaled, 
                y1));

        let three_mask: __m128 = _mm_cmpeq_ps(pole_mix_inv_int, three);

        let three_val: __m128 = y1;

        let mut mc: __m128 =_mm_add_ps(
            _mm_and_ps(
                zero_mask, 
                zero_val), 
            _mm_and_ps(
                one_mask, 
                one_val));

        mc =_mm_add_ps(
            mc, 
            _mm_add_ps(
                _mm_and_ps(
                    two_mask, 
                    two_val), 
                _mm_and_ps(
                    three_mask, 
                    three_val)));


        // half volume compensation
        let out = _mm_mul_ps(
            mc, 
            _mm_add_ps(
                one, 
                _mm_mul_ps(
                    qfu.coeff[Obxd24dBCoeff::R24], 
                    m128_zero_four_five![])));

        _mm_mul_ps( 
            out, 
            m128_gain_adjustment_4pole![])
    }
}