95 lines
1.9 KiB
C
95 lines
1.9 KiB
C
/*
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* Copyright (C) 2013 Andrea Mazzoleni
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "internal.h"
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#define RAID_SWAP(a, b) \
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do { \
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if (v[a] > v[b]) { \
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int t = v[a]; \
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v[a] = v[b]; \
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v[b] = t; \
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} \
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} while (0)
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void raid_sort(int n, int *v)
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{
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/* sorting networks generated with Batcher's Merge-Exchange */
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switch (n) {
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case 2:
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RAID_SWAP(0, 1);
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break;
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case 3:
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RAID_SWAP(0, 2);
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RAID_SWAP(0, 1);
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RAID_SWAP(1, 2);
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break;
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case 4:
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RAID_SWAP(0, 2);
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RAID_SWAP(1, 3);
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RAID_SWAP(0, 1);
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RAID_SWAP(2, 3);
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RAID_SWAP(1, 2);
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break;
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case 5:
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RAID_SWAP(0, 4);
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RAID_SWAP(0, 2);
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RAID_SWAP(1, 3);
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RAID_SWAP(2, 4);
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RAID_SWAP(0, 1);
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RAID_SWAP(2, 3);
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RAID_SWAP(1, 4);
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RAID_SWAP(1, 2);
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RAID_SWAP(3, 4);
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break;
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case 6:
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RAID_SWAP(0, 4);
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RAID_SWAP(1, 5);
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RAID_SWAP(0, 2);
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RAID_SWAP(1, 3);
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RAID_SWAP(2, 4);
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RAID_SWAP(3, 5);
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RAID_SWAP(0, 1);
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RAID_SWAP(2, 3);
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RAID_SWAP(4, 5);
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RAID_SWAP(1, 4);
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RAID_SWAP(1, 2);
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RAID_SWAP(3, 4);
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break;
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}
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}
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void raid_insert(int n, int *v, int i)
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{
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/* we don't use binary search because this is intended */
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/* for very small vectors and we want to optimize the case */
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/* of elements inserted already in order */
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/* insert at the end */
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v[n] = i;
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/* swap until in the correct position */
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while (n > 0 && v[n - 1] > v[n]) {
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/* swap */
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int t = v[n - 1];
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v[n - 1] = v[n];
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v[n] = t;
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/* previous position */
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--n;
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}
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}
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