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https://github.com/k3s-io/k3s.git
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237 lines
6.1 KiB
Go
237 lines
6.1 KiB
Go
// Copyright ©2014 The Gonum Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package mat
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import (
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"sync"
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"gonum.org/v1/gonum/blas"
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"gonum.org/v1/gonum/blas/blas64"
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)
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var tab64 = [64]byte{
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0x3f, 0x00, 0x3a, 0x01, 0x3b, 0x2f, 0x35, 0x02,
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0x3c, 0x27, 0x30, 0x1b, 0x36, 0x21, 0x2a, 0x03,
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0x3d, 0x33, 0x25, 0x28, 0x31, 0x12, 0x1c, 0x14,
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0x37, 0x1e, 0x22, 0x0b, 0x2b, 0x0e, 0x16, 0x04,
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0x3e, 0x39, 0x2e, 0x34, 0x26, 0x1a, 0x20, 0x29,
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0x32, 0x24, 0x11, 0x13, 0x1d, 0x0a, 0x0d, 0x15,
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0x38, 0x2d, 0x19, 0x1f, 0x23, 0x10, 0x09, 0x0c,
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0x2c, 0x18, 0x0f, 0x08, 0x17, 0x07, 0x06, 0x05,
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}
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// bits returns the ceiling of base 2 log of v.
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// Approach based on http://stackoverflow.com/a/11398748.
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func bits(v uint64) byte {
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if v == 0 {
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return 0
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}
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v <<= 2
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v--
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v |= v >> 1
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v |= v >> 2
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v |= v >> 4
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v |= v >> 8
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v |= v >> 16
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v |= v >> 32
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return tab64[((v-(v>>1))*0x07EDD5E59A4E28C2)>>58] - 1
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}
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var (
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// pool contains size stratified workspace Dense pools.
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// Each pool element i returns sized matrices with a data
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// slice capped at 1<<i.
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pool [63]sync.Pool
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// poolSym is the SymDense equivalent of pool.
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poolSym [63]sync.Pool
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// poolTri is the TriDense equivalent of pool.
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poolTri [63]sync.Pool
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// poolVec is the VecDense equivalent of pool.
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poolVec [63]sync.Pool
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// poolFloats is the []float64 equivalent of pool.
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poolFloats [63]sync.Pool
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// poolInts is the []int equivalent of pool.
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poolInts [63]sync.Pool
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)
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func init() {
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for i := range pool {
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l := 1 << uint(i)
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pool[i].New = func() interface{} {
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return &Dense{mat: blas64.General{
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Data: make([]float64, l),
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}}
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}
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poolSym[i].New = func() interface{} {
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return &SymDense{mat: blas64.Symmetric{
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Uplo: blas.Upper,
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Data: make([]float64, l),
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}}
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}
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poolTri[i].New = func() interface{} {
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return &TriDense{mat: blas64.Triangular{
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Data: make([]float64, l),
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}}
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}
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poolVec[i].New = func() interface{} {
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return &VecDense{mat: blas64.Vector{
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Inc: 1,
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Data: make([]float64, l),
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}}
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}
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poolFloats[i].New = func() interface{} {
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return make([]float64, l)
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}
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poolInts[i].New = func() interface{} {
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return make([]int, l)
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}
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}
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}
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// getWorkspace returns a *Dense of size r×c and a data slice
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// with a cap that is less than 2*r*c. If clear is true, the
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// data slice visible through the Matrix interface is zeroed.
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func getWorkspace(r, c int, clear bool) *Dense {
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l := uint64(r * c)
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w := pool[bits(l)].Get().(*Dense)
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w.mat.Data = w.mat.Data[:l]
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if clear {
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zero(w.mat.Data)
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}
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w.mat.Rows = r
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w.mat.Cols = c
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w.mat.Stride = c
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w.capRows = r
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w.capCols = c
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return w
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}
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// putWorkspace replaces a used *Dense into the appropriate size
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// workspace pool. putWorkspace must not be called with a matrix
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// where references to the underlying data slice have been kept.
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func putWorkspace(w *Dense) {
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pool[bits(uint64(cap(w.mat.Data)))].Put(w)
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}
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// getWorkspaceSym returns a *SymDense of size n and a cap that
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// is less than 2*n. If clear is true, the data slice visible
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// through the Matrix interface is zeroed.
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func getWorkspaceSym(n int, clear bool) *SymDense {
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l := uint64(n)
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l *= l
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s := poolSym[bits(l)].Get().(*SymDense)
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s.mat.Data = s.mat.Data[:l]
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if clear {
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zero(s.mat.Data)
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}
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s.mat.N = n
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s.mat.Stride = n
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s.cap = n
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return s
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}
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// putWorkspaceSym replaces a used *SymDense into the appropriate size
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// workspace pool. putWorkspaceSym must not be called with a matrix
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// where references to the underlying data slice have been kept.
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func putWorkspaceSym(s *SymDense) {
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poolSym[bits(uint64(cap(s.mat.Data)))].Put(s)
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}
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// getWorkspaceTri returns a *TriDense of size n and a cap that
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// is less than 2*n. If clear is true, the data slice visible
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// through the Matrix interface is zeroed.
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func getWorkspaceTri(n int, kind TriKind, clear bool) *TriDense {
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l := uint64(n)
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l *= l
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t := poolTri[bits(l)].Get().(*TriDense)
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t.mat.Data = t.mat.Data[:l]
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if clear {
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zero(t.mat.Data)
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}
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t.mat.N = n
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t.mat.Stride = n
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if kind == Upper {
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t.mat.Uplo = blas.Upper
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} else if kind == Lower {
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t.mat.Uplo = blas.Lower
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} else {
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panic(ErrTriangle)
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}
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t.mat.Diag = blas.NonUnit
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t.cap = n
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return t
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}
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// putWorkspaceTri replaces a used *TriDense into the appropriate size
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// workspace pool. putWorkspaceTri must not be called with a matrix
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// where references to the underlying data slice have been kept.
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func putWorkspaceTri(t *TriDense) {
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poolTri[bits(uint64(cap(t.mat.Data)))].Put(t)
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}
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// getWorkspaceVec returns a *VecDense of length n and a cap that
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// is less than 2*n. If clear is true, the data slice visible
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// through the Matrix interface is zeroed.
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func getWorkspaceVec(n int, clear bool) *VecDense {
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l := uint64(n)
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v := poolVec[bits(l)].Get().(*VecDense)
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v.mat.Data = v.mat.Data[:l]
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if clear {
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zero(v.mat.Data)
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}
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v.mat.N = n
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return v
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}
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// putWorkspaceVec replaces a used *VecDense into the appropriate size
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// workspace pool. putWorkspaceVec must not be called with a matrix
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// where references to the underlying data slice have been kept.
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func putWorkspaceVec(v *VecDense) {
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poolVec[bits(uint64(cap(v.mat.Data)))].Put(v)
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}
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// getFloats returns a []float64 of length l and a cap that is
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// less than 2*l. If clear is true, the slice visible is zeroed.
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func getFloats(l int, clear bool) []float64 {
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w := poolFloats[bits(uint64(l))].Get().([]float64)
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w = w[:l]
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if clear {
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zero(w)
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}
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return w
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}
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// putFloats replaces a used []float64 into the appropriate size
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// workspace pool. putFloats must not be called with a slice
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// where references to the underlying data have been kept.
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func putFloats(w []float64) {
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poolFloats[bits(uint64(cap(w)))].Put(w)
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}
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// getInts returns a []ints of length l and a cap that is
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// less than 2*l. If clear is true, the slice visible is zeroed.
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func getInts(l int, clear bool) []int {
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w := poolInts[bits(uint64(l))].Get().([]int)
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w = w[:l]
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if clear {
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for i := range w {
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w[i] = 0
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}
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}
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return w
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}
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// putInts replaces a used []int into the appropriate size
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// workspace pool. putInts must not be called with a slice
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// where references to the underlying data have been kept.
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func putInts(w []int) {
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poolInts[bits(uint64(cap(w)))].Put(w)
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}
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