-
Notifications
You must be signed in to change notification settings - Fork 27
/
pool.go
184 lines (166 loc) · 4.8 KB
/
pool.go
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
// Copyright ©2014 The gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package mat64
import (
"sync"
"github.com/gonum/blas"
"github.com/gonum/blas/blas64"
"github.com/gonum/matrix"
)
var tab64 = [64]byte{
0x3f, 0x00, 0x3a, 0x01, 0x3b, 0x2f, 0x35, 0x02,
0x3c, 0x27, 0x30, 0x1b, 0x36, 0x21, 0x2a, 0x03,
0x3d, 0x33, 0x25, 0x28, 0x31, 0x12, 0x1c, 0x14,
0x37, 0x1e, 0x22, 0x0b, 0x2b, 0x0e, 0x16, 0x04,
0x3e, 0x39, 0x2e, 0x34, 0x26, 0x1a, 0x20, 0x29,
0x32, 0x24, 0x11, 0x13, 0x1d, 0x0a, 0x0d, 0x15,
0x38, 0x2d, 0x19, 0x1f, 0x23, 0x10, 0x09, 0x0c,
0x2c, 0x18, 0x0f, 0x08, 0x17, 0x07, 0x06, 0x05,
}
// bits returns the ceiling of base 2 log of v.
// Approach based on http://stackoverflow.com/a/11398748.
func bits(v uint64) byte {
if v == 0 {
return 0
}
v <<= 2
v--
v |= v >> 1
v |= v >> 2
v |= v >> 4
v |= v >> 8
v |= v >> 16
v |= v >> 32
return tab64[((v-(v>>1))*0x07EDD5E59A4E28C2)>>58] - 1
}
var (
// pool contains size stratified workspace Dense pools.
// Each pool element i returns sized matrices with a data
// slice capped at 1<<i.
pool [63]sync.Pool
// poolSym is the SymDense equivalent of pool.
poolSym [63]sync.Pool
// poolTri is the TriDense equivalent of pool.
poolTri [63]sync.Pool
// poolVec is the Vector equivalent of pool.
poolVec [63]sync.Pool
)
func init() {
for i := range pool {
l := 1 << uint(i)
pool[i].New = func() interface{} {
return &Dense{mat: blas64.General{
Data: make([]float64, l),
}}
}
poolSym[i].New = func() interface{} {
return &SymDense{mat: blas64.Symmetric{
Uplo: blas.Upper,
Data: make([]float64, l),
}}
}
poolTri[i].New = func() interface{} {
return &TriDense{mat: blas64.Triangular{
Data: make([]float64, l),
}}
}
poolVec[i].New = func() interface{} {
return &Vector{mat: blas64.Vector{
Inc: 1,
Data: make([]float64, l),
}}
}
}
}
// getWorkspace returns a *Dense of size r×c and a data slice
// with a cap that is less than 2*r*c. If clear is true, the
// data slice visible through the Matrix interface is zeroed.
func getWorkspace(r, c int, clear bool) *Dense {
l := uint64(r * c)
w := pool[bits(l)].Get().(*Dense)
w.mat.Data = w.mat.Data[:l]
if clear {
zero(w.mat.Data)
}
w.mat.Rows = r
w.mat.Cols = c
w.mat.Stride = c
w.capRows = r
w.capCols = c
return w
}
// putWorkspace replaces a used *Dense into the appropriate size
// workspace pool. putWorkspace must not be called with a matrix
// where references to the underlying data slice has been kept.
func putWorkspace(w *Dense) {
pool[bits(uint64(cap(w.mat.Data)))].Put(w)
}
// getWorkspaceSym returns a *SymDense of size n and a cap that is less than 2*n. If clear is true, the
// data slice visible through the Matrix interface is zeroed.
func getWorkspaceSym(n int, clear bool) *SymDense {
l := uint64(n)
l *= l
s := poolSym[bits(l)].Get().(*SymDense)
s.mat.Data = s.mat.Data[:l]
if clear {
zero(s.mat.Data)
}
s.mat.N = n
s.mat.Stride = n
s.cap = n
return s
}
// getWorkspaceTri returns a *TriDense of size n and a cap that is less than 2*n.
// If clear is true, the data slice visible through the Matrix interface is zeroed.
func getWorkspaceTri(n int, kind matrix.TriKind, clear bool) *TriDense {
l := uint64(n)
l *= l
t := poolTri[bits(l)].Get().(*TriDense)
t.mat.Data = t.mat.Data[:l]
if clear {
zero(t.mat.Data)
}
t.mat.N = n
t.mat.Stride = n
if kind == matrix.Upper {
t.mat.Uplo = blas.Upper
} else if kind == matrix.Lower {
t.mat.Uplo = blas.Lower
} else {
panic(matrix.ErrTriangle)
}
t.mat.Diag = blas.NonUnit
t.cap = n
return t
}
// putWorkspaceSym replaces a used *SymDense into the appropriate size
// workspace pool. putWorkspaceSym must not be called with a matrix
// where references to the underlying data slice has been kept.
func putWorkspaceSym(s *SymDense) {
poolSym[bits(uint64(cap(s.mat.Data)))].Put(s)
}
// putWorkspaceTri replaces a used *TriDense into the appropriate size
// workspace pool. putWorkspaceTri must not be called with a matrix
// where references to the underlying data slice has been kept.
func putWorkspaceTri(t *TriDense) {
poolTri[bits(uint64(cap(t.mat.Data)))].Put(t)
}
// getWorkspaceVec returns a *Vector of length n and a cap that is less than 2*n. If clear is true, the
// data slice visible through the Matrix interface is zeroed.
func getWorkspaceVec(n int, clear bool) *Vector {
l := uint64(n)
v := poolVec[bits(l)].Get().(*Vector)
v.mat.Data = v.mat.Data[:l]
if clear {
zero(v.mat.Data)
}
v.n = n
return v
}
// putWorkspaceVec replaces a used *Vector into the appropriate size
// workspace pool. putWorkspaceVec must not be called with a matrix
// where references to the underlying data slice has been kept.
func putWorkspaceVec(v *Vector) {
poolVec[bits(uint64(cap(v.mat.Data)))].Put(v)
}