mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-05 08:21:16 -05:00
35 lines
604 B
C
35 lines
604 B
C
|
/*
|
||
|
|
Reduce N times while excluding ith input element
|
||
|
|
|
||
|
|
Copyright 2018 Ahmet Inan <inan@aicodix.de>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef EXCLUSIVE_REDUCE_HH
|
||
|
|
#define EXCLUSIVE_REDUCE_HH
|
||
|
|
|
||
|
|
namespace ldpctool {
|
||
|
|
namespace CODE {
|
||
|
|
|
||
|
|
template <typename TYPE, typename OPERATOR>
|
||
|
|
void exclusive_reduce(const TYPE *in, TYPE *out, int N, OPERATOR op)
|
||
|
|
{
|
||
|
|
TYPE pre = in[0];
|
||
|
|
for (int i = 1; i < N-1; ++i) {
|
||
|
|
out[i] = pre;
|
||
|
|
pre = op(pre, in[i]);
|
||
|
|
}
|
||
|
|
out[N-1] = pre;
|
||
|
|
TYPE suf = in[N-1];
|
||
|
|
for (int i = N-2; i > 0; --i) {
|
||
|
|
out[i] = op(out[i], suf);
|
||
|
|
suf = op(suf, in[i]);
|
||
|
|
}
|
||
|
|
out[0] = suf;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace CODE
|
||
|
|
} // namespace ldpctool
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|