mirror of
https://github.com/amadvance/snapraid.git
synced 2026-10-26 10:51:54 -04:00
83 lines
1.4 KiB
C
83 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
// Copyright (C) 2013 Andrea Mazzoleni
|
|
|
|
#include "internal.h"
|
|
|
|
#define RAID_SWAP(a, b) \
|
|
do { \
|
|
if (v[a] > v[b]) { \
|
|
int t = v[a]; \
|
|
v[a] = v[b]; \
|
|
v[b] = t; \
|
|
} \
|
|
} while (0)
|
|
|
|
void raid_sort(int n, int *v)
|
|
{
|
|
/* sorting networks generated with Batcher's Merge-Exchange */
|
|
switch (n) {
|
|
case 2:
|
|
RAID_SWAP(0, 1);
|
|
break;
|
|
case 3:
|
|
RAID_SWAP(0, 2);
|
|
RAID_SWAP(0, 1);
|
|
RAID_SWAP(1, 2);
|
|
break;
|
|
case 4:
|
|
RAID_SWAP(0, 2);
|
|
RAID_SWAP(1, 3);
|
|
RAID_SWAP(0, 1);
|
|
RAID_SWAP(2, 3);
|
|
RAID_SWAP(1, 2);
|
|
break;
|
|
case 5:
|
|
RAID_SWAP(0, 4);
|
|
RAID_SWAP(0, 2);
|
|
RAID_SWAP(1, 3);
|
|
RAID_SWAP(2, 4);
|
|
RAID_SWAP(0, 1);
|
|
RAID_SWAP(2, 3);
|
|
RAID_SWAP(1, 4);
|
|
RAID_SWAP(1, 2);
|
|
RAID_SWAP(3, 4);
|
|
break;
|
|
case 6:
|
|
RAID_SWAP(0, 4);
|
|
RAID_SWAP(1, 5);
|
|
RAID_SWAP(0, 2);
|
|
RAID_SWAP(1, 3);
|
|
RAID_SWAP(2, 4);
|
|
RAID_SWAP(3, 5);
|
|
RAID_SWAP(0, 1);
|
|
RAID_SWAP(2, 3);
|
|
RAID_SWAP(4, 5);
|
|
RAID_SWAP(1, 4);
|
|
RAID_SWAP(1, 2);
|
|
RAID_SWAP(3, 4);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void raid_insert(int n, int *v, int i)
|
|
{
|
|
/* we don't use binary search because this is intended */
|
|
/* for very small vectors and we want to optimize the case */
|
|
/* of elements inserted already in order */
|
|
|
|
/* insert at the end */
|
|
v[n] = i;
|
|
|
|
/* swap until in the correct position */
|
|
while (n > 0 && v[n - 1] > v[n]) {
|
|
/* swap */
|
|
int t = v[n - 1];
|
|
|
|
v[n - 1] = v[n];
|
|
v[n] = t;
|
|
|
|
/* previous position */
|
|
--n;
|
|
}
|
|
}
|
|
|