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Comparing deliantra/server/include/util.h (file contents):
Revision 1.91 by root, Thu Oct 15 21:09:32 2009 UTC vs.
Revision 1.96 by root, Wed Nov 11 03:52:44 2009 UTC

… …
21 */ 21 */
22 22
23#ifndef UTIL_H__ 23#ifndef UTIL_H__
24#define UTIL_H__ 24#define UTIL_H__
25 25
26#include <compiler.h>
27
26#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0 28#define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
27#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs 29#define DEBUG_SALLOC 0 // add a debug wrapper around all sallocs
28#define PREFER_MALLOC 0 // use malloc and not the slice allocator 30#define PREFER_MALLOC 0 // use malloc and not the slice allocator
29
30#if __GNUC__ >= 3
31# define is_constant(c) __builtin_constant_p (c)
32# define expect(expr,value) __builtin_expect ((expr),(value))
33# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
34# define noinline __attribute__((__noinline__))
35#else
36# define is_constant(c) 0
37# define expect(expr,value) (expr)
38# define prefetch(addr,rw,locality)
39# define noinline
40#endif
41
42#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
43# define decltype(x) typeof(x)
44#endif
45
46// put into ifs if you are very sure that the expression
47// is mostly true or mosty false. note that these return
48// booleans, not the expression.
49#define expect_false(expr) expect ((expr) ? 1 : 0, 0)
50#define expect_true(expr) expect ((expr) ? 1 : 0, 1)
51 31
52#include <pthread.h> 32#include <pthread.h>
53 33
54#include <cstddef> 34#include <cstddef>
55#include <cmath> 35#include <cmath>
… …
206 int32_t d = b - a; 186 int32_t d = b - a;
207 d &= d >> 31; 187 d &= d >> 31;
208 return b - d; 188 return b - d;
209} 189}
210 190
211// this is much faster than crossfires original algorithm 191// this is much faster than crossfire's original algorithm
212// on modern cpus 192// on modern cpus
213inline int 193inline int
214isqrt (int n) 194isqrt (int n)
215{ 195{
216 return (int)sqrtf ((float)n); 196 return (int)sqrtf ((float)n);
197}
198
199// this is kind of like the ^^ operator, if it would exist, without sequence point.
200// more handy than it looks like, due to the implicit !! done on its arguments
201inline bool
202logical_xor (bool a, bool b)
203{
204 return a != b;
205}
206
207inline bool
208logical_implies (bool a, bool b)
209{
210 return a <= b;
217} 211}
218 212
219// this is only twice as fast as naive sqrtf (dx*dy+dy*dy) 213// this is only twice as fast as naive sqrtf (dx*dy+dy*dy)
220#if 0 214#if 0
221// and has a max. error of 6 in the range -100..+100. 215// and has a max. error of 6 in the range -100..+100.
… …
246absdir (int d) 240absdir (int d)
247{ 241{
248 return ((d - 1) & 7) + 1; 242 return ((d - 1) & 7) + 1;
249} 243}
250 244
245// avoid ctz name because netbsd or freebsd spams it's namespace with it
246#if GCC_VERSION(3,4)
247static inline int least_significant_bit (uint32_t x)
248{
249 return __builtin_ctz (x);
250}
251#else
252int least_significant_bit (uint32_t x);
253#endif
254
255#define for_all_bits_sparse_32(mask, idxvar) \
256 for (uint32_t idxvar, mask_ = mask; \
257 mask_ && ((idxvar = least_significant_bit (mask_)), mask_ &= ~(1 << idxvar), 1);)
258
251extern ssize_t slice_alloc; // statistics 259extern ssize_t slice_alloc; // statistics
252 260
253void *salloc_ (int n) throw (std::bad_alloc); 261void *salloc_ (int n) throw (std::bad_alloc);
254void *salloc_ (int n, void *src) throw (std::bad_alloc); 262void *salloc_ (int n, void *src) throw (std::bad_alloc);
255 263
… …
552typedef refptr<object> object_ptr; 560typedef refptr<object> object_ptr;
553typedef refptr<archetype> arch_ptr; 561typedef refptr<archetype> arch_ptr;
554typedef refptr<client> client_ptr; 562typedef refptr<client> client_ptr;
555typedef refptr<player> player_ptr; 563typedef refptr<player> player_ptr;
556 564
565#define STRHSH_NULL 2166136261
566
567static inline uint32_t
568strhsh (const char *s)
569{
570 // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
571 // it is about twice as fast as the one-at-a-time one,
572 // with good distribution.
573 // FNV-1a is faster on many cpus because the multiplication
574 // runs concurrently with the looping logic.
575 uint32_t hash = STRHSH_NULL;
576
577 while (*s)
578 hash = (hash ^ *s++) * 16777619;
579
580 return hash;
581}
582
583static inline uint32_t
584memhsh (const char *s, size_t len)
585{
586 uint32_t hash = STRHSH_NULL;
587
588 while (len--)
589 hash = (hash ^ *s++) * 16777619;
590
591 return hash;
592}
593
557struct str_hash 594struct str_hash
558{ 595{
559 std::size_t operator ()(const char *s) const 596 std::size_t operator ()(const char *s) const
560 { 597 {
561#if 0
562 uint32_t hash = 0;
563
564 /* use the one-at-a-time hash function, which supposedly is
565 * better than the djb2-like one used by perl5.005, but
566 * certainly is better then the bug used here before.
567 * see http://burtleburtle.net/bob/hash/doobs.html
568 */
569 while (*s)
570 {
571 hash += *s++;
572 hash += hash << 10;
573 hash ^= hash >> 6;
574 }
575
576 hash += hash << 3;
577 hash ^= hash >> 11;
578 hash += hash << 15;
579#else
580 // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
581 // it is about twice as fast as the one-at-a-time one,
582 // with good distribution.
583 // FNV-1a is faster on many cpus because the multiplication
584 // runs concurrent with the looping logic.
585 uint32_t hash = 2166136261;
586
587 while (*s)
588 hash = (hash ^ *s++) * 16777619;
589#endif
590
591 return hash; 598 return strhsh (s);
599 }
600
601 std::size_t operator ()(const shstr &s) const
602 {
603 return strhsh (s);
592 } 604 }
593}; 605};
594 606
595struct str_equal 607struct str_equal
596{ 608{
… …
708 720
709int similar_direction (int a, int b); 721int similar_direction (int a, int b);
710 722
711// like v?sprintf, but returns a "static" buffer 723// like v?sprintf, but returns a "static" buffer
712char *vformat (const char *format, va_list ap); 724char *vformat (const char *format, va_list ap);
713char *format (const char *format, ...); 725char *format (const char *format, ...) attribute ((format (printf, 1, 2)));
714 726
715// safety-check player input which will become object->msg 727// safety-check player input which will become object->msg
716bool msg_is_safe (const char *msg); 728bool msg_is_safe (const char *msg);
717 729
718///////////////////////////////////////////////////////////////////////////// 730/////////////////////////////////////////////////////////////////////////////

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