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annotate src/stdlib/SDL_qsort.c @ 4532:dc4a3de60d3a

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jul 2010 00:40:17 -0700
parents 0aaa7f52d1c6
children
rev   line source
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
1 /* qsort.c
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
2 * (c) 1998 Gareth McCaughan
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
3 *
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
4 * This is a drop-in replacement for the C library's |qsort()| routine.
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
5 *
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
6 * Features:
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
7 * - Median-of-three pivoting (and more)
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
8 * - Truncation and final polishing by a single insertion sort
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
9 * - Early truncation when no swaps needed in pivoting step
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
10 * - Explicit recursion, guaranteed not to overflow
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
11 * - A few little wrinkles stolen from the GNU |qsort()|.
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
12 * - separate code for non-aligned / aligned / word-size objects
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
13 *
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
14 * This code may be reproduced freely provided
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
15 * - this file is retained unaltered apart from minor
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
16 * changes for portability and efficiency
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
17 * - no changes are made to this comment
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
18 * - any changes that *are* made are clearly flagged
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
19 * - the _ID string below is altered by inserting, after
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
20 * the date, the string " altered" followed at your option
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
21 * by other material. (Exceptions: you may change the name
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
22 * of the exported routine without changing the ID string.
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
23 * You may change the values of the macros TRUNC_* and
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
24 * PIVOT_THRESHOLD without changing the ID string, provided
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
25 * they remain constants with TRUNC_nonaligned, TRUNC_aligned
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
26 * and TRUNC_words/WORD_BYTES between 8 and 24, and
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
27 * PIVOT_THRESHOLD between 32 and 200.)
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
28 *
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
29 * You may use it in anything you like; you may make money
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
30 * out of it; you may distribute it in object form or as
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
31 * part of an executable without including source code;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
32 * you don't have to credit me. (But it would be nice if
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
33 * you did.)
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
34 *
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
35 * If you find problems with this code, or find ways of
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
36 * making it significantly faster, please let me know!
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
37 * My e-mail address, valid as of early 1998 and certainly
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
38 * OK for at least the next 18 months, is
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
39 * gjm11@dpmms.cam.ac.uk
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
40 * Thanks!
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
41 *
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
42 * Gareth McCaughan Peterhouse Cambridge 1998
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
43 */
1402
d910939febfa Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents: 1354
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44 #include "SDL_config.h"
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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45
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
46 /*
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
47 #include <assert.h>
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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48 #include <stdlib.h>
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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49 #include <string.h>
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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50 */
1354
22f39393668a Fixed build problem with SDL_string.c
Sam Lantinga <slouken@libsdl.org>
parents: 1337
diff changeset
51 #include "SDL_stdinc.h"
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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52
3616
0aaa7f52d1c6 Merged r4710:4711 from branches/SDL-1.2: Mac OS X SDL_stdlib qsort build fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3162
diff changeset
53 #ifdef assert
0aaa7f52d1c6 Merged r4710:4711 from branches/SDL-1.2: Mac OS X SDL_stdlib qsort build fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 3162
diff changeset
54 #undef assert
0aaa7f52d1c6 Merged r4710:4711 from branches/SDL-1.2: Mac OS X SDL_stdlib qsort build fixes.
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55 #endif
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56 #define assert(X)
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57 #ifdef malloc
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58 #undef malloc
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59 #endif
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60 #define malloc SDL_malloc
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61 #ifdef free
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62 #undef free
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63 #endif
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64 #define free SDL_free
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65 #ifdef memcpy
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66 #undef memcpy
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67 #endif
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68 #define memcpy SDL_memcpy
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69 #ifdef memmove
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70 #undef memmove
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71 #endif
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72 #define memmove SDL_memmove
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73 #ifdef qsort
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74 #undef qsort
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75 #endif
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76 #define qsort SDL_qsort
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77
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78
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79 #ifndef HAVE_QSORT
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80
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81 static const char _ID[] = "<qsort.c gjm 1.12 1998-03-19>";
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82
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83 /* How many bytes are there per word? (Must be a power of 2,
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84 * and must in fact equal sizeof(int).)
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85 */
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86 #define WORD_BYTES sizeof(int)
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87
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88 /* How big does our stack need to be? Answer: one entry per
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89 * bit in a |size_t|.
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90 */
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91 #define STACK_SIZE (8*sizeof(size_t))
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92
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93 /* Different situations have slightly different requirements,
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94 * and we make life epsilon easier by using different truncation
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95 * points for the three different cases.
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96 * So far, I have tuned TRUNC_words and guessed that the same
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97 * value might work well for the other two cases. Of course
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98 * what works well on my machine might work badly on yours.
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99 */
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100 #define TRUNC_nonaligned 12
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101 #define TRUNC_aligned 12
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102 #define TRUNC_words 12*WORD_BYTES /* nb different meaning */
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103
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104 /* We use a simple pivoting algorithm for shortish sub-arrays
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105 * and a more complicated one for larger ones. The threshold
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106 * is PIVOT_THRESHOLD.
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107 */
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108 #define PIVOT_THRESHOLD 40
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109
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110 typedef struct
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111 {
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112 char *first;
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113 char *last;
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114 } stack_entry;
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115 #define pushLeft {stack[stacktop].first=ffirst;stack[stacktop++].last=last;}
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116 #define pushRight {stack[stacktop].first=first;stack[stacktop++].last=llast;}
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117 #define doLeft {first=ffirst;llast=last;continue;}
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118 #define doRight {ffirst=first;last=llast;continue;}
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119 #define pop {if (--stacktop<0) break;\
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120 first=ffirst=stack[stacktop].first;\
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121 last=llast=stack[stacktop].last;\
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122 continue;}
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123
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124 /* Some comments on the implementation.
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125 * 1. When we finish partitioning the array into "low"
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126 * and "high", we forget entirely about short subarrays,
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127 * because they'll be done later by insertion sort.
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128 * Doing lots of little insertion sorts might be a win
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129 * on large datasets for locality-of-reference reasons,
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130 * but it makes the code much nastier and increases
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131 * bookkeeping overhead.
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132 * 2. We always save the shorter and get to work on the
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133 * longer. This guarantees that every time we push
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134 * an item onto the stack its size is <= 1/2 of that
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135 * of its parent; so the stack can't need more than
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136 * log_2(max-array-size) entries.
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137 * 3. We choose a pivot by looking at the first, last
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138 * and middle elements. We arrange them into order
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139 * because it's easy to do that in conjunction with
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140 * choosing the pivot, and it makes things a little
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141 * easier in the partitioning step. Anyway, the pivot
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142 * is the middle of these three. It's still possible
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143 * to construct datasets where the algorithm takes
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144 * time of order n^2, but it simply never happens in
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145 * practice.
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146 * 3' Newsflash: On further investigation I find that
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147 * it's easy to construct datasets where median-of-3
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148 * simply isn't good enough. So on large-ish subarrays
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149 * we do a more sophisticated pivoting: we take three
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150 * sets of 3 elements, find their medians, and then
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151 * take the median of those.
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152 * 4. We copy the pivot element to a separate place
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153 * because that way we can always do our comparisons
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154 * directly against a pointer to that separate place,
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155 * and don't have to wonder "did we move the pivot
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156 * element?". This makes the inner loop better.
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157 * 5. It's possible to make the pivoting even more
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158 * reliable by looking at more candidates when n
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159 * is larger. (Taking this to its logical conclusion
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160 * results in a variant of quicksort that doesn't
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161 * have that n^2 worst case.) However, the overhead
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162 * from the extra bookkeeping means that it's just
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163 * not worth while.
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164 * 6. This is pretty clean and portable code. Here are
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165 * all the potential portability pitfalls and problems
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166 * I know of:
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167 * - In one place (the insertion sort) I construct
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168 * a pointer that points just past the end of the
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169 * supplied array, and assume that (a) it won't
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170 * compare equal to any pointer within the array,
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171 * and (b) it will compare equal to a pointer
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172 * obtained by stepping off the end of the array.
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173 * These might fail on some segmented architectures.
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174 * - I assume that there are 8 bits in a |char| when
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175 * computing the size of stack needed. This would
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176 * fail on machines with 9-bit or 16-bit bytes.
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177 * - I assume that if |((int)base&(sizeof(int)-1))==0|
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178 * and |(size&(sizeof(int)-1))==0| then it's safe to
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179 * get at array elements via |int*|s, and that if
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180 * actually |size==sizeof(int)| as well then it's
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181 * safe to treat the elements as |int|s. This might
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182 * fail on systems that convert pointers to integers
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183 * in non-standard ways.
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184 * - I assume that |8*sizeof(size_t)<=INT_MAX|. This
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185 * would be false on a machine with 8-bit |char|s,
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diff changeset
186 * 16-bit |int|s and 4096-bit |size_t|s. :-)
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187 */
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188
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189 /* The recursion logic is the same in each case: */
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diff changeset
190 #define Recurse(Trunc) \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
191 { size_t l=last-ffirst,r=llast-first; \
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192 if (l<Trunc) { \
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193 if (r>=Trunc) doRight \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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194 else pop \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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195 } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
196 else if (l<=r) { pushLeft; doRight } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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197 else if (r>=Trunc) { pushRight; doLeft }\
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198 else doLeft \
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199 }
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200
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diff changeset
201 /* and so is the pivoting logic: */
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202 #define Pivot(swapper,sz) \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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203 if ((size_t)(last-first)>PIVOT_THRESHOLD*sz) mid=pivot_big(first,mid,last,sz,compare);\
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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204 else { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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205 if (compare(first,mid)<0) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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206 if (compare(mid,last)>0) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
207 swapper(mid,last); \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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208 if (compare(first,mid)>0) swapper(first,mid);\
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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209 } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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210 } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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211 else { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
212 if (compare(mid,last)>0) swapper(first,last)\
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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213 else { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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214 swapper(first,mid); \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
215 if (compare(mid,last)>0) swapper(mid,last);\
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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216 } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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217 } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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218 first+=sz; last-=sz; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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219 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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220
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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221 #ifdef DEBUG_QSORT
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222 #include <stdio.h>
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223 #endif
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224
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225 /* and so is the partitioning logic: */
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226 #define Partition(swapper,sz) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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227 int swapped=0; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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228 do { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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229 while (compare(first,pivot)<0) first+=sz; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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230 while (compare(pivot,last)<0) last-=sz; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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231 if (first<last) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
232 swapper(first,last); swapped=1; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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233 first+=sz; last-=sz; } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
234 else if (first==last) { first+=sz; last-=sz; break; }\
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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235 } while (first<=last); \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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236 if (!swapped) pop \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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237 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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238
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
239 /* and so is the pre-insertion-sort operation of putting
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240 * the smallest element into place as a sentinel.
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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241 * Doing this makes the inner loop nicer. I got this
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
242 * idea from the GNU implementation of qsort().
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
243 */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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244 #define PreInsertion(swapper,limit,sz) \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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245 first=base; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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246 last=first + (nmemb>limit ? limit : nmemb-1)*sz;\
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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247 while (last!=base) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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248 if (compare(first,last)>0) first=last; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
249 last-=sz; } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
250 if (first!=base) swapper(first,(char*)base);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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251
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
252 /* and so is the insertion sort, in the first two cases: */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
253 #define Insertion(swapper) \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
254 last=((char*)base)+nmemb*size; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
255 for (first=((char*)base)+size;first!=last;first+=size) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
256 char *test; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
257 /* Find the right place for |first|. \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
258 * My apologies for var reuse. */ \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
259 for (test=first-size;compare(test,first)>0;test-=size) ; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
260 test+=size; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
261 if (test!=first) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
262 /* Shift everything in [test,first) \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
263 * up by one, and place |first| \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
264 * where |test| is. */ \
1337
c687f06c7473 Don't touch code that we brought in from other sources
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parents: 1336
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265 memcpy(pivot,first,size); \
c687f06c7473 Don't touch code that we brought in from other sources
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266 memmove(test+size,test,first-test); \
c687f06c7473 Don't touch code that we brought in from other sources
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diff changeset
267 memcpy(test,pivot,size); \
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
268 } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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269 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
270
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
271 #define SWAP_nonaligned(a,b) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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272 register char *aa=(a),*bb=(b); \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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273 register size_t sz=size; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
274 do { register char t=*aa; *aa++=*bb; *bb++=t; } while (--sz); }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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275
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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276 #define SWAP_aligned(a,b) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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277 register int *aa=(int*)(a),*bb=(int*)(b); \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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278 register size_t sz=size; \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
279 do { register int t=*aa;*aa++=*bb; *bb++=t; } while (sz-=WORD_BYTES); }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
280
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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281 #define SWAP_words(a,b) { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
282 register int t=*((int*)a); *((int*)a)=*((int*)b); *((int*)b)=t; }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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283
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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284 /* ---------------------------------------------------------------------- */
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285
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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286 static char *
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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287 pivot_big(char *first, char *mid, char *last, size_t size,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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288 int compare(const void *, const void *))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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289 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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290 size_t d = (((last - first) / size) >> 3) * size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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291 char *m1, *m2, *m3;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
292 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
293 char *a = first, *b = first + d, *c = first + 2 * d;
1330
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diff changeset
294 #ifdef DEBUG_QSORT
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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295 fprintf(stderr, "< %d %d %d\n", *(int *) a, *(int *) b, *(int *) c);
1330
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296 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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297 m1 = compare(a, b) < 0 ?
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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298 (compare(b, c) < 0 ? b : (compare(a, c) < 0 ? c : a))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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299 : (compare(a, c) < 0 ? a : (compare(b, c) < 0 ? c : b));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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300 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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301 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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302 char *a = mid - d, *b = mid, *c = mid + d;
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
303 #ifdef DEBUG_QSORT
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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304 fprintf(stderr, ". %d %d %d\n", *(int *) a, *(int *) b, *(int *) c);
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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305 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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306 m2 = compare(a, b) < 0 ?
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
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307 (compare(b, c) < 0 ? b : (compare(a, c) < 0 ? c : a))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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308 : (compare(a, c) < 0 ? a : (compare(b, c) < 0 ? c : b));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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309 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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310 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
311 char *a = last - 2 * d, *b = last - d, *c = last;
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312 #ifdef DEBUG_QSORT
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313 fprintf(stderr, "> %d %d %d\n", *(int *) a, *(int *) b, *(int *) c);
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diff changeset
314 #endif
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diff changeset
315 m3 = compare(a, b) < 0 ?
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
316 (compare(b, c) < 0 ? b : (compare(a, c) < 0 ? c : a))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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317 : (compare(a, c) < 0 ? a : (compare(b, c) < 0 ? c : b));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
318 }
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diff changeset
319 #ifdef DEBUG_QSORT
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diff changeset
320 fprintf(stderr, "-> %d %d %d\n", *(int *) m1, *(int *) m2, *(int *) m3);
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diff changeset
321 #endif
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diff changeset
322 return compare(m1, m2) < 0 ?
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
323 (compare(m2, m3) < 0 ? m2 : (compare(m1, m3) < 0 ? m3 : m1))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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324 : (compare(m1, m3) < 0 ? m1 : (compare(m2, m3) < 0 ? m3 : m2));
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325 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
326
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
327 /* ---------------------------------------------------------------------- */
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parents:
diff changeset
328
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diff changeset
329 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
330 qsort_nonaligned(void *base, size_t nmemb, size_t size,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
331 int (*compare) (const void *, const void *))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
332 {
1330
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diff changeset
333
1895
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diff changeset
334 stack_entry stack[STACK_SIZE];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
335 int stacktop = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
336 char *first, *last;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
337 char *pivot = malloc(size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
338 size_t trunc = TRUNC_nonaligned * size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
339 assert(pivot != 0);
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diff changeset
340
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diff changeset
341 first = (char *) base;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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342 last = first + (nmemb - 1) * size;
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diff changeset
343
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diff changeset
344 if ((size_t) (last - first) > trunc) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
345 char *ffirst = first, *llast = last;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
346 while (1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
347 /* Select pivot */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
348 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
349 char *mid = first + size * ((last - first) / size >> 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
350 Pivot(SWAP_nonaligned, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
351 memcpy(pivot, mid, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
352 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
353 /* Partition. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
354 Partition(SWAP_nonaligned, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
355 /* Prepare to recurse/iterate. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
356 Recurse(trunc)}
1330
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diff changeset
357 }
1895
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diff changeset
358 PreInsertion(SWAP_nonaligned, TRUNC_nonaligned, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
359 Insertion(SWAP_nonaligned);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
360 free(pivot);
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diff changeset
361 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
362
1895
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Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
363 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
364 qsort_aligned(void *base, size_t nmemb, size_t size,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
365 int (*compare) (const void *, const void *))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1456
diff changeset
366 {
1330
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diff changeset
367
1895
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parents: 1456
diff changeset
368 stack_entry stack[STACK_SIZE];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
369 int stacktop = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
370 char *first, *last;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
371 char *pivot = malloc(size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
372 size_t trunc = TRUNC_aligned * size;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
373 assert(pivot != 0);
1330
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diff changeset
374
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diff changeset
375 first = (char *) base;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
376 last = first + (nmemb - 1) * size;
1330
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diff changeset
377
1895
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parents: 1456
diff changeset
378 if ((size_t) (last - first) > trunc) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
379 char *ffirst = first, *llast = last;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
380 while (1) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
381 /* Select pivot */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
382 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
383 char *mid = first + size * ((last - first) / size >> 1);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
384 Pivot(SWAP_aligned, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
385 memcpy(pivot, mid, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
386 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
387 /* Partition. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
388 Partition(SWAP_aligned, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
389 /* Prepare to recurse/iterate. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
390 Recurse(trunc)}
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
391 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
392 PreInsertion(SWAP_aligned, TRUNC_aligned, size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
393 Insertion(SWAP_aligned);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
394 free(pivot);
1330
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diff changeset
395 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
396
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
397 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
398 qsort_words(void *base, size_t nmemb,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
399 int (*compare) (const void *, const void *))
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
400 {
1330
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parents:
diff changeset
401
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
402 stack_entry stack[STACK_SIZE];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
403 int stacktop = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
404 char *first, *last;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
405 char *pivot = malloc(WORD_BYTES);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
406 assert(pivot != 0);
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
407
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
408 first = (char *) base;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
409 last = first + (nmemb - 1) * WORD_BYTES;
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
410
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
411 if (last - first > TRUNC_words) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
412 char *ffirst = first, *llast = last;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
413 while (1) {
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
414 #ifdef DEBUG_QSORT
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
415 fprintf(stderr, "Doing %d:%d: ",
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
416 (first - (char *) base) / WORD_BYTES,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
417 (last - (char *) base) / WORD_BYTES);
1330
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
418 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
419 /* Select pivot */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
420 {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
421 char *mid =
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
422 first + WORD_BYTES * ((last - first) / (2 * WORD_BYTES));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
423 Pivot(SWAP_words, WORD_BYTES);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
424 *(int *) pivot = *(int *) mid;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
425 }
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
426 #ifdef DEBUG_QSORT
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
427 fprintf(stderr, "pivot=%d\n", *(int *) pivot);
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
428 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
429 /* Partition. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
430 Partition(SWAP_words, WORD_BYTES);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
431 /* Prepare to recurse/iterate. */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1456
diff changeset
432 Recurse(TRUNC_words)}
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
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433 }
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434 PreInsertion(SWAP_words, (TRUNC_words / WORD_BYTES), WORD_BYTES);
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435 /* Now do insertion sort. */
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436 last = ((char *) base) + nmemb * WORD_BYTES;
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437 for (first = ((char *) base) + WORD_BYTES; first != last;
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438 first += WORD_BYTES) {
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439 /* Find the right place for |first|. My apologies for var reuse */
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440 int *pl = (int *) (first - WORD_BYTES), *pr = (int *) first;
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441 *(int *) pivot = *(int *) first;
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442 for (; compare(pl, pivot) > 0; pr = pl, --pl) {
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443 *pr = *pl;
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444 }
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445 if (pr != (int *) first)
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446 *pr = *(int *) pivot;
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447 }
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448 free(pivot);
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449 }
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450
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451 /* ---------------------------------------------------------------------- */
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452
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453 void
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454 qsort(void *base, size_t nmemb, size_t size,
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455 int (*compare) (const void *, const void *))
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456 {
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457
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458 if (nmemb <= 1)
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459 return;
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460 if (((uintptr_t) base | size) & (WORD_BYTES - 1))
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461 qsort_nonaligned(base, nmemb, size, compare);
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462 else if (size != WORD_BYTES)
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463 qsort_aligned(base, nmemb, size, compare);
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464 else
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465 qsort_words(base, nmemb, compare);
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466 }
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467
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468 #endif /* !HAVE_QSORT */
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469 /* vi: set ts=4 sw=4 expandtab: */