core refactoring (#69)

core/src/layouts/prepared/gglwe_tsk.rs

@@ -0,0 +1,131 @@
+use backend::hal::{
+    api::{VmpPMatAlloc, VmpPMatAllocBytes, VmpPMatPrepare},
+    layouts::{Backend, Data, DataMut, DataRef, Module, Scratch, VmpPMat},
+};
+
+use crate::layouts::{GGLWETensorKey, Infos, prepared::GGLWESwitchingKeyExec};
+
+#[derive(PartialEq, Eq)]
+pub struct GGLWETensorKeyExec<D: Data, B: Backend> {
+    pub(crate) keys: Vec<GGLWESwitchingKeyExec<D, B>>,
+}
+
+impl<B: Backend> GGLWETensorKeyExec<Vec<u8>, B> {
+    pub fn alloc(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self
+    where
+        Module<B>: VmpPMatAlloc<B>,
+    {
+        let mut keys: Vec<GGLWESwitchingKeyExec<Vec<u8>, B>> = Vec::new();
+        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        (0..pairs).for_each(|_| {
+            keys.push(GGLWESwitchingKeyExec::alloc(
+                module, n, basek, k, rows, digits, 1, rank,
+            ));
+        });
+        Self { keys }
+    }
+
+    pub fn bytes_of(module: &Module<B>, n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize
+    where
+        Module<B>: VmpPMatAllocBytes,
+    {
+        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
+        pairs * GGLWESwitchingKeyExec::bytes_of(module, n, basek, k, rows, digits, 1, rank)
+    }
+
+    pub fn from<D: DataRef>(
+        module: &Module<B>,
+        other: &GGLWETensorKey<D>,
+        scratch: &mut Scratch<B>,
+    ) -> GGLWETensorKeyExec<Vec<u8>, B>
+    where
+        Module<B>: VmpPMatAlloc<B> + VmpPMatPrepare<B>,
+    {
+        let mut tsk_exec: GGLWETensorKeyExec<Vec<u8>, B> = Self::alloc(
+            module,
+            other.n(),
+            other.basek(),
+            other.k(),
+            other.rows(),
+            other.digits(),
+            other.rank(),
+        );
+        tsk_exec.prepare(module, other, scratch);
+        tsk_exec
+    }
+}
+
+impl<D: Data, B: Backend> Infos for GGLWETensorKeyExec<D, B> {
+    type Inner = VmpPMat<D, B>;
+
+    fn inner(&self) -> &Self::Inner {
+        &self.keys[0].inner()
+    }
+
+    fn basek(&self) -> usize {
+        self.keys[0].basek()
+    }
+
+    fn k(&self) -> usize {
+        self.keys[0].k()
+    }
+}
+
+impl<D: Data, B: Backend> GGLWETensorKeyExec<D, B> {
+    pub fn rank(&self) -> usize {
+        self.keys[0].rank()
+    }
+
+    pub fn rank_in(&self) -> usize {
+        self.keys[0].rank_in()
+    }
+
+    pub fn rank_out(&self) -> usize {
+        self.keys[0].rank_out()
+    }
+
+    pub fn digits(&self) -> usize {
+        self.keys[0].digits()
+    }
+}
+
+impl<D: DataMut, B: Backend> GGLWETensorKeyExec<D, B> {
+    // Returns a mutable reference to GLWESwitchingKey_{s}(s[i] * s[j])
+    pub fn at_mut(&mut self, mut i: usize, mut j: usize) -> &mut GGLWESwitchingKeyExec<D, B> {
+        if i > j {
+            std::mem::swap(&mut i, &mut j);
+        };
+        let rank: usize = self.rank();
+        &mut self.keys[i * rank + j - (i * (i + 1) / 2)]
+    }
+}
+
+impl<D: DataRef, B: Backend> GGLWETensorKeyExec<D, B> {
+    // Returns a reference to GLWESwitchingKey_{s}(s[i] * s[j])
+    pub fn at(&self, mut i: usize, mut j: usize) -> &GGLWESwitchingKeyExec<D, B> {
+        if i > j {
+            std::mem::swap(&mut i, &mut j);
+        };
+        let rank: usize = self.rank();
+        &self.keys[i * rank + j - (i * (i + 1) / 2)]
+    }
+}
+
+impl<D: DataMut, B: Backend> GGLWETensorKeyExec<D, B> {
+    pub fn prepare<DataOther>(&mut self, module: &Module<B>, other: &GGLWETensorKey<DataOther>, scratch: &mut Scratch<B>)
+    where
+        DataOther: DataRef,
+        Module<B>: VmpPMatPrepare<B>,
+    {
+        #[cfg(debug_assertions)]
+        {
+            assert_eq!(self.keys.len(), other.keys.len());
+        }
+        self.keys
+            .iter_mut()
+            .zip(other.keys.iter())
+            .for_each(|(a, b)| {
+                a.prepare(module, b, scratch);
+            });
+    }
+}