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
|
// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// unroll.h: Rcpp R/C++ interface class library -- loop unrolling macro
//
// Copyright (C) 2010 - 2017 Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp__macros_unroll_h
#define Rcpp__macros_unroll_h
#define RCPP_LOOP_UNROLL_PTR(TARGET,SOURCE) \
R_xlen_t __trip_count = n >> 2 ; \
R_xlen_t i = 0 ; \
for ( ; __trip_count > 0 ; --__trip_count) { \
*TARGET++ = SOURCE[i++] ; \
*TARGET++ = SOURCE[i++] ; \
*TARGET++ = SOURCE[i++] ; \
*TARGET++ = SOURCE[i++] ; \
} \
switch (n - i){ \
case 3: \
*TARGET++ = SOURCE[i++] ; \
case 2: \
*TARGET++ = SOURCE[i++] ; \
case 1: \
*TARGET++ = SOURCE[i++] ; \
case 0: \
default: \
{} \
}
#define RCPP_LOOP_UNROLL(TARGET,SOURCE) \
R_xlen_t __trip_count = n >> 2 ; \
R_xlen_t i = 0 ; \
for ( ; __trip_count > 0 ; --__trip_count) { \
TARGET[i] = SOURCE[i] ; i++ ; \
TARGET[i] = SOURCE[i] ; i++ ; \
TARGET[i] = SOURCE[i] ; i++ ; \
TARGET[i] = SOURCE[i] ; i++ ; \
} \
switch (n - i){ \
case 3: \
TARGET[i] = SOURCE[i] ; i++ ; /* fallthrough */ \
case 2: \
TARGET[i] = SOURCE[i] ; i++ ; /* fallthrough */ \
case 1: \
TARGET[i] = SOURCE[i] ; i++ ; /* fallthrough */ \
case 0: \
default: \
{} \
}
#define RCPP_LOOP_UNROLL_LHSFUN(TARGET,FUN,SOURCE) \
R_xlen_t __trip_count = n >> 2 ; \
R_xlen_t i = 0 ; \
for ( ; __trip_count > 0 ; --__trip_count) { \
TARGET[FUN(i)] = SOURCE[i] ; i++ ; \
TARGET[FUN(i)] = SOURCE[i] ; i++ ; \
TARGET[FUN(i)] = SOURCE[i] ; i++ ; \
TARGET[FUN(i)] = SOURCE[i] ; i++ ; \
} \
switch (n - i){ \
case 3: \
TARGET[FUN(i)] = SOURCE[i] ; i++ ; /* fallthrough */ \
case 2: \
TARGET[FUN(i)] = SOURCE[i] ; i++ ; /* fallthrough */ \
case 1: \
TARGET[FUN(i)] = SOURCE[i] ; i++ ; /* fallthrough */ \
case 0: \
default: \
{} \
}
#endif
|
