poulpy/base2k/src/vec_znx_dft_ops.rs
base2k/src/vec_znx_dft_ops.rsRaw
1use crate::ffi::{vec_znx_big, vec_znx_dft};
2use crate::vec_znx_dft::bytes_of_vec_znx_dft;
3use crate::znx_base::ZnxInfos;
4use crate::{
5 Backend, Scratch, VecZnxBig, VecZnxBigToMut, VecZnxDft, VecZnxDftOwned, VecZnxDftToMut, VecZnxDftToRef, VecZnxToRef,
6 ZnxSliceSize,
7};
8use crate::{FFT64, Module, ZnxView, ZnxViewMut, ZnxZero};
9use std::cmp::min;
10
11pub trait VecZnxDftAlloc<B: Backend> {
12 /// Allocates a vector Z[X]/(X^N+1) that stores normalized in the DFT space.
13 fn new_vec_znx_dft(&self, cols: usize, size: usize) -> VecZnxDftOwned<B>;
14
15 /// Returns a new [VecZnxDft] with the provided bytes array as backing array.
16 ///
17 /// Behavior: takes ownership of the backing array.
18 ///
19 /// # Arguments
20 ///
21 /// * `cols`: the number of cols of the [VecZnxDft].
22 /// * `bytes`: a byte array of size at least [Module::bytes_of_vec_znx_dft].
23 ///
24 /// # Panics
25 /// If `bytes.len()` < [Module::bytes_of_vec_znx_dft].
26 fn new_vec_znx_dft_from_bytes(&self, cols: usize, size: usize, bytes: Vec<u8>) -> VecZnxDftOwned<B>;
27
28 /// Returns a new [VecZnxDft] with the provided bytes array as backing array.
29 ///
30 /// # Arguments
31 ///
32 /// * `cols`: the number of cols of the [VecZnxDft].
33 /// * `bytes`: a byte array of size at least [Module::bytes_of_vec_znx_dft].
34 ///
35 /// # Panics
36 /// If `bytes.len()` < [Module::bytes_of_vec_znx_dft].
37 fn bytes_of_vec_znx_dft(&self, cols: usize, size: usize) -> usize;
38}
39
40pub trait VecZnxDftOps<B: Backend> {
41 /// Returns the minimum number of bytes necessary to allocate
42 /// a new [VecZnxDft] through [VecZnxDft::from_bytes].
43 fn vec_znx_idft_tmp_bytes(&self) -> usize;
44
45 fn vec_znx_dft_add<R, A, D>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize, b: &D, b_col: usize)
46 where
47 R: VecZnxDftToMut<B>,
48 A: VecZnxDftToRef<B>,
49 D: VecZnxDftToRef<B>;
50
51 fn vec_znx_dft_add_inplace<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize)
52 where
53 R: VecZnxDftToMut<B>,
54 A: VecZnxDftToRef<B>;
55
56 fn vec_znx_dft_copy<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize)
57 where
58 R: VecZnxDftToMut<B>,
59 A: VecZnxDftToRef<B>;
60
61 /// b <- IDFT(a), uses a as scratch space.
62 fn vec_znx_idft_tmp_a<R, A>(&self, res: &mut R, res_col: usize, a: &mut A, a_col: usize)
63 where
64 R: VecZnxBigToMut<B>,
65 A: VecZnxDftToMut<B>;
66
67 /// Consumes a to return IDFT(a) in big coeff space.
68 fn vec_znx_idft_consume<D>(&self, a: VecZnxDft<D, B>) -> VecZnxBig<D, FFT64>
69 where
70 VecZnxDft<D, FFT64>: VecZnxDftToMut<FFT64>;
71
72 fn vec_znx_idft<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize, scratch: &mut Scratch)
73 where
74 R: VecZnxBigToMut<B>,
75 A: VecZnxDftToRef<B>;
76
77 fn vec_znx_dft<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize)
78 where
79 R: VecZnxDftToMut<B>,
80 A: VecZnxToRef;
81}
82
83impl<B: Backend> VecZnxDftAlloc<B> for Module<B> {
84 fn new_vec_znx_dft(&self, cols: usize, size: usize) -> VecZnxDftOwned<B> {
85 VecZnxDftOwned::new(&self, cols, size)
86 }
87
88 fn new_vec_znx_dft_from_bytes(&self, cols: usize, size: usize, bytes: Vec<u8>) -> VecZnxDftOwned<B> {
89 VecZnxDftOwned::new_from_bytes(self, cols, size, bytes)
90 }
91
92 fn bytes_of_vec_znx_dft(&self, cols: usize, size: usize) -> usize {
93 bytes_of_vec_znx_dft(self, cols, size)
94 }
95}
96
97impl VecZnxDftOps<FFT64> for Module<FFT64> {
98 fn vec_znx_dft_add<R, A, D>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize, b: &D, b_col: usize)
99 where
100 R: VecZnxDftToMut<FFT64>,
101 A: VecZnxDftToRef<FFT64>,
102 D: VecZnxDftToRef<FFT64>,
103 {
104 let mut res_mut: VecZnxDft<&mut [u8], FFT64> = res.to_mut();
105 let a_ref: VecZnxDft<&[u8], FFT64> = a.to_ref();
106 let b_ref: VecZnxDft<&[u8], FFT64> = b.to_ref();
107
108 let min_size: usize = res_mut.size().min(a_ref.size()).min(b_ref.size());
109
110 unsafe {
111 (0..min_size).for_each(|j| {
112 vec_znx_dft::vec_dft_add(
113 self.ptr,
114 res_mut.at_mut_ptr(res_col, j) as *mut vec_znx_dft::vec_znx_dft_t,
115 1,
116 a_ref.at_ptr(a_col, j) as *const vec_znx_dft::vec_znx_dft_t,
117 1,
118 b_ref.at_ptr(b_col, j) as *const vec_znx_dft::vec_znx_dft_t,
119 1,
120 );
121 });
122 }
123 (min_size..res_mut.size()).for_each(|j| {
124 res_mut.zero_at(res_col, j);
125 })
126 }
127
128 fn vec_znx_dft_add_inplace<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize)
129 where
130 R: VecZnxDftToMut<FFT64>,
131 A: VecZnxDftToRef<FFT64>,
132 {
133 let mut res_mut: VecZnxDft<&mut [u8], FFT64> = res.to_mut();
134 let a_ref: VecZnxDft<&[u8], FFT64> = a.to_ref();
135
136 let min_size: usize = res_mut.size().min(a_ref.size());
137
138 unsafe {
139 (0..min_size).for_each(|j| {
140 vec_znx_dft::vec_dft_add(
141 self.ptr,
142 res_mut.at_mut_ptr(res_col, j) as *mut vec_znx_dft::vec_znx_dft_t,
143 1,
144 res_mut.at_ptr(res_col, j) as *const vec_znx_dft::vec_znx_dft_t,
145 1,
146 a_ref.at_ptr(a_col, j) as *const vec_znx_dft::vec_znx_dft_t,
147 1,
148 );
149 });
150 }
151 (min_size..res_mut.size()).for_each(|j| {
152 res_mut.zero_at(res_col, j);
153 })
154 }
155
156 fn vec_znx_dft_copy<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize)
157 where
158 R: VecZnxDftToMut<FFT64>,
159 A: VecZnxDftToRef<FFT64>,
160 {
161 let mut res_mut: VecZnxDft<&mut [u8], FFT64> = res.to_mut();
162 let a_ref: VecZnxDft<&[u8], FFT64> = a.to_ref();
163
164 let min_size: usize = min(res_mut.size(), a_ref.size());
165
166 (0..min_size).for_each(|j| {
167 res_mut
168 .at_mut(res_col, j)
169 .copy_from_slice(a_ref.at(a_col, j));
170 });
171 (min_size..res_mut.size()).for_each(|j| {
172 res_mut.zero_at(res_col, j);
173 })
174 }
175
176 fn vec_znx_idft_tmp_a<R, A>(&self, res: &mut R, res_col: usize, a: &mut A, a_col: usize)
177 where
178 R: VecZnxBigToMut<FFT64>,
179 A: VecZnxDftToMut<FFT64>,
180 {
181 let mut res_mut: VecZnxBig<&mut [u8], FFT64> = res.to_mut();
182 let mut a_mut: VecZnxDft<&mut [u8], FFT64> = a.to_mut();
183
184 let min_size: usize = min(res_mut.size(), a_mut.size());
185
186 unsafe {
187 (0..min_size).for_each(|j| {
188 vec_znx_dft::vec_znx_idft_tmp_a(
189 self.ptr,
190 res_mut.at_mut_ptr(res_col, j) as *mut vec_znx_big::vec_znx_big_t,
191 1 as u64,
192 a_mut.at_mut_ptr(a_col, j) as *mut vec_znx_dft::vec_znx_dft_t,
193 1 as u64,
194 )
195 });
196 (min_size..res_mut.size()).for_each(|j| {
197 res_mut.zero_at(res_col, j);
198 })
199 }
200 }
201
202 fn vec_znx_idft_consume<D>(&self, mut a: VecZnxDft<D, FFT64>) -> VecZnxBig<D, FFT64>
203 where
204 VecZnxDft<D, FFT64>: VecZnxDftToMut<FFT64>,
205 {
206 let mut a_mut: VecZnxDft<&mut [u8], FFT64> = a.to_mut();
207
208 unsafe {
209 // Rev col and rows because ZnxDft.sl() >= ZnxBig.sl()
210 (0..a_mut.size()).for_each(|j| {
211 (0..a_mut.cols()).for_each(|i| {
212 vec_znx_dft::vec_znx_idft_tmp_a(
213 self.ptr,
214 a_mut.at_mut_ptr(i, j) as *mut vec_znx_big::vec_znx_big_t,
215 1 as u64,
216 a_mut.at_mut_ptr(i, j) as *mut vec_znx_dft::vec_znx_dft_t,
217 1 as u64,
218 )
219 });
220 });
221 }
222
223 a.into_big()
224 }
225
226 fn vec_znx_idft_tmp_bytes(&self) -> usize {
227 unsafe { vec_znx_dft::vec_znx_idft_tmp_bytes(self.ptr) as usize }
228 }
229
230 /// b <- DFT(a)
231 ///
232 /// # Panics
233 /// If b.cols < a_col
234 fn vec_znx_dft<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize)
235 where
236 R: VecZnxDftToMut<FFT64>,
237 A: VecZnxToRef,
238 {
239 let mut res_mut: VecZnxDft<&mut [u8], FFT64> = res.to_mut();
240 let a_ref: crate::VecZnx<&[u8]> = a.to_ref();
241
242 let min_size: usize = min(res_mut.size(), a_ref.size());
243
244 unsafe {
245 (0..min_size).for_each(|j| {
246 vec_znx_dft::vec_znx_dft(
247 self.ptr,
248 res_mut.at_mut_ptr(res_col, j) as *mut vec_znx_dft::vec_znx_dft_t,
249 1 as u64,
250 a_ref.at_ptr(a_col, j),
251 1 as u64,
252 a_ref.sl() as u64,
253 )
254 });
255 (min_size..res_mut.size()).for_each(|j| {
256 res_mut.zero_at(res_col, j);
257 });
258 }
259 }
260
261 // b <- IDFT(a), scratch space size obtained with [vec_znx_idft_tmp_bytes].
262 fn vec_znx_idft<R, A>(&self, res: &mut R, res_col: usize, a: &A, a_col: usize, scratch: &mut Scratch)
263 where
264 R: VecZnxBigToMut<FFT64>,
265 A: VecZnxDftToRef<FFT64>,
266 {
267 let mut res_mut: VecZnxBig<&mut [u8], FFT64> = res.to_mut();
268 let a_ref: VecZnxDft<&[u8], FFT64> = a.to_ref();
269
270 let (tmp_bytes, _) = scratch.tmp_slice(self.vec_znx_idft_tmp_bytes());
271
272 let min_size: usize = min(res_mut.size(), a_ref.size());
273
274 unsafe {
275 (0..min_size).for_each(|j| {
276 vec_znx_dft::vec_znx_idft(
277 self.ptr,
278 res_mut.at_mut_ptr(res_col, j) as *mut vec_znx_big::vec_znx_big_t,
279 1 as u64,
280 a_ref.at_ptr(a_col, j) as *const vec_znx_dft::vec_znx_dft_t,
281 1 as u64,
282 tmp_bytes.as_mut_ptr(),
283 )
284 });
285 (min_size..res_mut.size()).for_each(|j| {
286 res_mut.zero_at(res_col, j);
287 });
288 }
289 }
290}