lax/
qr.rs

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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
//! QR decomposition

use crate::{error::*, layout::MatrixLayout, *};
use cauchy::*;
use num_traits::{ToPrimitive, Zero};

pub struct HouseholderWork<T: Scalar> {
    pub m: i32,
    pub n: i32,
    pub layout: MatrixLayout,
    pub tau: Vec<MaybeUninit<T>>,
    pub work: Vec<MaybeUninit<T>>,
}

pub trait HouseholderWorkImpl: Sized {
    type Elem: Scalar;
    fn new(l: MatrixLayout) -> Result<Self>;
    fn calc(&mut self, a: &mut [Self::Elem]) -> Result<&[Self::Elem]>;
    fn eval(self, a: &mut [Self::Elem]) -> Result<Vec<Self::Elem>>;
}

macro_rules! impl_householder_work {
    ($s:ty, $qrf:path, $lqf: path) => {
        impl HouseholderWorkImpl for HouseholderWork<$s> {
            type Elem = $s;

            fn new(layout: MatrixLayout) -> Result<Self> {
                let m = layout.lda();
                let n = layout.len();
                let k = m.min(n);
                let mut tau = vec_uninit(k as usize);
                let mut info = 0;
                let mut work_size = [Self::Elem::zero()];
                match layout {
                    MatrixLayout::F { .. } => unsafe {
                        $qrf(
                            &m,
                            &n,
                            std::ptr::null_mut(),
                            &m,
                            AsPtr::as_mut_ptr(&mut tau),
                            AsPtr::as_mut_ptr(&mut work_size),
                            &(-1),
                            &mut info,
                        )
                    },
                    MatrixLayout::C { .. } => unsafe {
                        $lqf(
                            &m,
                            &n,
                            std::ptr::null_mut(),
                            &m,
                            AsPtr::as_mut_ptr(&mut tau),
                            AsPtr::as_mut_ptr(&mut work_size),
                            &(-1),
                            &mut info,
                        )
                    },
                }
                info.as_lapack_result()?;
                let lwork = work_size[0].to_usize().unwrap();
                let work = vec_uninit(lwork);
                Ok(HouseholderWork {
                    n,
                    m,
                    layout,
                    tau,
                    work,
                })
            }

            fn calc(&mut self, a: &mut [Self::Elem]) -> Result<&[Self::Elem]> {
                let lwork = self.work.len().to_i32().unwrap();
                let mut info = 0;
                match self.layout {
                    MatrixLayout::F { .. } => unsafe {
                        $qrf(
                            &self.m,
                            &self.n,
                            AsPtr::as_mut_ptr(a),
                            &self.m,
                            AsPtr::as_mut_ptr(&mut self.tau),
                            AsPtr::as_mut_ptr(&mut self.work),
                            &lwork,
                            &mut info,
                        );
                    },
                    MatrixLayout::C { .. } => unsafe {
                        $lqf(
                            &self.m,
                            &self.n,
                            AsPtr::as_mut_ptr(a),
                            &self.m,
                            AsPtr::as_mut_ptr(&mut self.tau),
                            AsPtr::as_mut_ptr(&mut self.work),
                            &lwork,
                            &mut info,
                        );
                    },
                }
                info.as_lapack_result()?;
                Ok(unsafe { self.tau.slice_assume_init_ref() })
            }

            fn eval(mut self, a: &mut [Self::Elem]) -> Result<Vec<Self::Elem>> {
                let _eig = self.calc(a)?;
                Ok(unsafe { self.tau.assume_init() })
            }
        }
    };
}
impl_householder_work!(c64, lapack_sys::zgeqrf_, lapack_sys::zgelqf_);
impl_householder_work!(c32, lapack_sys::cgeqrf_, lapack_sys::cgelqf_);
impl_householder_work!(f64, lapack_sys::dgeqrf_, lapack_sys::dgelqf_);
impl_householder_work!(f32, lapack_sys::sgeqrf_, lapack_sys::sgelqf_);

pub struct QWork<T: Scalar> {
    pub layout: MatrixLayout,
    pub work: Vec<MaybeUninit<T>>,
}

pub trait QWorkImpl: Sized {
    type Elem: Scalar;
    fn new(layout: MatrixLayout) -> Result<Self>;
    fn calc(&mut self, a: &mut [Self::Elem], tau: &[Self::Elem]) -> Result<()>;
}

macro_rules! impl_q_work {
    ($s:ty, $gqr:path, $glq:path) => {
        impl QWorkImpl for QWork<$s> {
            type Elem = $s;

            fn new(layout: MatrixLayout) -> Result<Self> {
                let m = layout.lda();
                let n = layout.len();
                let k = m.min(n);
                let mut info = 0;
                let mut work_size = [Self::Elem::zero()];
                match layout {
                    MatrixLayout::F { .. } => unsafe {
                        $gqr(
                            &m,
                            &k,
                            &k,
                            std::ptr::null_mut(),
                            &m,
                            std::ptr::null_mut(),
                            AsPtr::as_mut_ptr(&mut work_size),
                            &(-1),
                            &mut info,
                        )
                    },
                    MatrixLayout::C { .. } => unsafe {
                        $glq(
                            &k,
                            &n,
                            &k,
                            std::ptr::null_mut(),
                            &m,
                            std::ptr::null_mut(),
                            AsPtr::as_mut_ptr(&mut work_size),
                            &(-1),
                            &mut info,
                        )
                    },
                }
                let lwork = work_size[0].to_usize().unwrap();
                let work = vec_uninit(lwork);
                Ok(QWork { layout, work })
            }

            fn calc(&mut self, a: &mut [Self::Elem], tau: &[Self::Elem]) -> Result<()> {
                let m = self.layout.lda();
                let n = self.layout.len();
                let k = m.min(n);
                let lwork = self.work.len().to_i32().unwrap();
                let mut info = 0;
                match self.layout {
                    MatrixLayout::F { .. } => unsafe {
                        $gqr(
                            &m,
                            &k,
                            &k,
                            AsPtr::as_mut_ptr(a),
                            &m,
                            AsPtr::as_ptr(&tau),
                            AsPtr::as_mut_ptr(&mut self.work),
                            &lwork,
                            &mut info,
                        )
                    },
                    MatrixLayout::C { .. } => unsafe {
                        $glq(
                            &k,
                            &n,
                            &k,
                            AsPtr::as_mut_ptr(a),
                            &m,
                            AsPtr::as_ptr(&tau),
                            AsPtr::as_mut_ptr(&mut self.work),
                            &lwork,
                            &mut info,
                        )
                    },
                }
                info.as_lapack_result()?;
                Ok(())
            }
        }
    };
}

impl_q_work!(c64, lapack_sys::zungqr_, lapack_sys::zunglq_);
impl_q_work!(c32, lapack_sys::cungqr_, lapack_sys::cunglq_);
impl_q_work!(f64, lapack_sys::dorgqr_, lapack_sys::dorglq_);
impl_q_work!(f32, lapack_sys::sorgqr_, lapack_sys::sorglq_);