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Revision: 1.39
Committed: Fri Mar 25 08:44:14 2022 UTC (2 years, 2 months ago) by root
Branch: MAIN
Changes since 1.38: +6 -0 lines
Log Message:
add hilbert2d

File Contents

# Content
1 TODO: naming of cutnions, index_to_coord, xy_to_s, xy_to_linear/seq, 32/64
2 TODO: returning packed coordinates, really
3 TODO: support order=0?
4 0x0001000c
5 - added ecb_hilbert2d function family.
6
7 0x0001000b
8 - added ecb_gray*_{de,en}code functions.
9
10 0x0001000a
11 - added ecb_ptrmix.
12
13 0x00010009
14 - added ecb_i2a family of functions.
15 - added ECB_64BIT_NATIVE.
16
17 TODO:
18 08:30:06 <b_jonas> I think it could be worth to add a macro that works like alignof or _Alignof on sane
19 compilers, and like __alignof on MS compilers that support it, see
20 http://msdn.microsoft.com/en-us/library/45t0s5f4.aspx
21 08:30:24 <b_jonas> even if you can't support it on all the old compilers
22 08:31:17 <b_jonas> I'd also like a macro for alignas, but sadly, that seems impossible in general, because
23 the MS compiler only has some half-attempt to do something similar but with different and
24 more broken semantics, see http://msdn.microsoft.com/en-us/library/83ythb65.aspx
25 08:31:35 <b_jonas> but I wonder if some special case could still be worth to support
26 08:32:23 <b_jonas> probably not, because it would just account to making a union with a highly aligned type,
27 which is something I can do on any compiler portably
28
29 TODO: #define ECB_IS_INTEGRAL(x) !((1 ? 1 : (x)) / 2)
30 #define ECB_IS_INTEGRAL(x) (sizeof ((x) + 1.0f) != sizeof((x) + 1ULL))
31
32 TODO: ecb_minpot, either using bit tricks or ecb_ldXX
33
34 TODO: __builtin_popcountll exists...
35
36 TODO: __builtin_powi
37
38 TODO: https://gustedt.wordpress.com/2010/06/08/detect-empty-macro-arguments/
39
40 implement is_constant for c11: https://gustedt.wordpress.com/2013/08/22/testing-compile-time-constness-and-null-pointers-with-c11s-_generic/
41
42 #ifdef _MSC_VER
43
44 #include <stdlib.h>
45 #define bswap_32(x) _byteswap_ulong(x)
46 #define bswap_64(x) _byteswap_uint64(x)
47
48 #elif defined(__APPLE__)
49
50 // Mac OS X / Darwin features
51 #include <libkern/OSByteOrder.h>
52 #define bswap_32(x) OSSwapInt32(x)
53 #define bswap_64(x) OSSwapInt64(x)
54
55 #elif defined(__sun) || defined(sun)
56
57 #include <sys/byteorder.h>
58 #define bswap_32(x) BSWAP_32(x)
59 #define bswap_64(x) BSWAP_64(x)
60
61 #elif defined(__FreeBSD__)
62
63 #include <sys/endian.h>
64 #define bswap_32(x) bswap32(x)
65 #define bswap_64(x) bswap64(x)
66
67 #elif defined(__OpenBSD__)
68
69 #include <sys/types.h>
70 #define bswap_32(x) swap32(x)
71 #define bswap_64(x) swap64(x)
72
73 #elif defined(__NetBSD__)
74
75 #include <sys/types.h>
76 #include <machine/bswap.h>
77 #if defined(__BSWAP_RENAME) && !defined(__bswap_32)
78 #define bswap_32(x) bswap32(x)
79 #define bswap_64(x) bswap64(x)
80 #endif
81
82 #else
83
84 #include <byteswap.h>
85
86 #endif
87
88 TODO: generic poprcount etc., also fast_t for them?
89
90 - allow any rotate count in rcb_rot*, at the expense
91 of bad optimisation results on some platforms or with
92 some word sizes.
93 - try to use inttypes.h on mingw.
94
95 0x00010008
96 - aligned/unaligned load/store, bswap, host order
97 conversion.
98 - generic C++ ecb_rot[lr], ecb_popcount, ecb_ctz,
99 ecb_is_pot32 and ecb_bitrev functions.
100
101 0x00010007
102 - new ECB_OPTIMIZE_SIZE symbol.
103
104 0x00010006
105 - new ECB_MEMORY_FENCE_RELAXED memory fence.
106 - use acquire/eelease memory barriers on sun workshop pro, not read/write.
107 - rely on c++ compiler barriers to do the right thing in gcc/clang.
108 - change release memory fence to memory barrier on ia32/ia64.
109 - apply ctz/ld patch for msc by Zsbán Ambrus.
110 - ECB_PTRSIZE erroneously was 8 on most 32bit systems (
111 found by Zsbán Ambrus).
112 - improved compiletime detection of endianness, also, allow
113 runtime detection to indicate other-than-big/little endianness.
114 - no memory barrier neded on arm < 6.
115
116 0x00010005
117 - improve ecb_binary16_to_float.
118 - add ecb_float_to_binary16.
119 - add ecb_binary16_to_binary32 and ecb_binary32_to_binary16 pair.
120
121 0x00010001
122 - add ecb_is_pot32/64.
123 - add intptr_t/uintptr_t.
124 - add ECB_PTRSIZE.
125 - more macros for C/C++ version checks.
126 - support C11 atomics for memory fences.
127 - support gcc-4.7 atomics for memory fences.
128 - support m68k, m88k and sh (patch by Miod Vallat).
129 - add ecb_binary16_to_float.
130
131 TODO: ecb_restrict_array etc. http://ue.tst.eu/5093eafd713ec5fda776d8065070aa4c.txt
132 TODO: ffs
133 64 bit variants of everything
134 TODO: examples from X for clz/ctz
135 TODO: arithmetic right shift
136 TODO: template/generic functions for x32/x64 and so on
137 TODO: #define ecb_integer_multiples_of(n,d) ((char (*)[d])(n) - (char (*)[d])0)
138 TODO: generalised shift
139 TODO: #define ECB_FAST_UNALIGNED_ACCESS
140 unsigned long gensh(unsigned long v, int x) {
141 int a, b;
142 a = (v << x) & -(((unsigned int)x) < 32);
143 x = -x;
144 b = (v >> x) & -(((unsigned int)x) < 32);
145 return a|b;
146 }
147
148 TODO: export(=dllexport) & hidden
149 TODO: flatten
150 TODO: warning(msg)
151 TODO: error(msg)
152 TODO: leaf (uh), noclone (hmmm)
153 TODO: nonnull, returns_nonnull
154 TODO: nothrow
155 TODO: used
156 TODO: trap
157 TODO: http://llvm.org/docs/doxygen/html/Compiler_8h_source.html
158
159 TODO: read/write unaligned macros
160 TODO: htonl and friends
161 TODO: macro to convert from unsigned to signed "the natural way"
162 TODO: ecb_static_assert, with message (just like boost), or somesuch, using array-declaration
163 TODO: alignof
164
165