[ViewVC] Annotation of: cvs/libecb/Changes

TODO: 
08:30:06 <b_jonas> I think it could be worth to add a macro that works like alignof or _Alignof on sane 
                   compilers, and like __alignof on MS compilers that support it, see 
                   http://msdn.microsoft.com/en-us/library/45t0s5f4.aspx
08:30:24 <b_jonas> even if you can't support it on all the old compilers
08:31:17 <b_jonas> I'd also like a macro for alignas, but sadly, that seems impossible in general, because 
                   the MS compiler only has some half-attempt to do something similar but with different and 
                   more broken semantics, see http://msdn.microsoft.com/en-us/library/83ythb65.aspx
08:31:35 <b_jonas> but I wonder if some special case could still be worth to support
08:32:23 <b_jonas> probably not, because it would just account to making a union with a highly aligned type, 
                   which is something I can do on any compiler portably

TODO: #define ECB_IS_INTEGRAL(x) !((1 ? 1 : (x)) / 2)
      #define ECB_IS_INTEGRAL(x) (sizeof ((x) + 1.0f) != sizeof((x) + 1ULL))

TODO: ecb_minpot, either using bit tricks or ecb_ldXX

TODO: __builtin_popcountll exists...

TODO: unaligned access

TODO: __builtin_powi

TODO: https://gustedt.wordpress.com/2010/06/08/detect-empty-macro-arguments/

implement is_constant for c11: https://gustedt.wordpress.com/2013/08/22/testing-compile-time-constness-and-null-pointers-with-c11s-_generic/

#ifdef _MSC_VER

#include <stdlib.h>
#define bswap_32(x) _byteswap_ulong(x)
#define bswap_64(x) _byteswap_uint64(x)

#elif defined(__APPLE__)

// Mac OS X / Darwin features
#include <libkern/OSByteOrder.h>
#define bswap_32(x) OSSwapInt32(x)
#define bswap_64(x) OSSwapInt64(x)

#elif defined(__sun) || defined(sun)

#include <sys/byteorder.h>
#define bswap_32(x) BSWAP_32(x)
#define bswap_64(x) BSWAP_64(x)

#elif defined(__FreeBSD__)

#include <sys/endian.h>
#define bswap_32(x) bswap32(x)
#define bswap_64(x) bswap64(x)

#elif defined(__OpenBSD__)

#include <sys/types.h>
#define bswap_32(x) swap32(x)
#define bswap_64(x) swap64(x)

#elif defined(__NetBSD__)

#include <sys/types.h>
#include <machine/bswap.h>
#if defined(__BSWAP_RENAME) && !defined(__bswap_32)
#define bswap_32(x) bswap32(x)
#define bswap_64(x) bswap64(x)
#endif

#else

#include <byteswap.h>

#endif

0x00010007
        - new ECB_OPTIMIZE_SIZE symbol.

0x00010006
        - new ECB_MEMORY_FENCE_RELAXED memory fence.
        - use acquire/eelease memory barriers on sun workshop pro, not read/write.
        - rely on c++ compiler barriers to do the right thing in gcc/clang.
        - change release memory fence to memory barrier on ia32/ia64.
        - apply ctz/ld patch for msc by Zsbán Ambrus.
        - ECB_PTRSIZE erroneously was 8 on most 32bit systems (
          found by Zsbán Ambrus).
        - improved compiletime detection of endianness, also, allow
          runtime detection to indicate other-than-big/little endianness.
        - no memory barrier neded on arm < 6.

0x00010005
        - improve ecb_binary16_to_float.
        - add ecb_float_to_binary16.
        - add ecb_binary16_to_binary32 and ecb_binary32_to_binary16 pair.

0x00010001
        - add ecb_is_pot32/64.
        - add intptr_t/uintptr_t.
        - add ECB_PTRSIZE.
        - more macros for C/C++ version checks.
        - support C11 atomics for memory fences.
        - support gcc-4.7 atomics for memory fences.
        - support m68k, m88k and sh (patch by Miod Vallat).
        - add ecb_binary16_to_float.

TODO: ecb_restrict_array etc. http://ue.tst.eu/5093eafd713ec5fda776d8065070aa4c.txt
TODO: ffs
64 bit variants of everything
TODO: examples from X for clz/ctz
TODO: arithmetic right shift
TODO: template/generic functions for x32/x64 and so on
TODO: #define ecb_integer_multiples_of(n,d) ((char (*)[d])(n) - (char (*)[d])0)
TODO: generalised shift
TODO: #define ECB_FAST_UNALIGNED_ACCESS
unsigned long gensh(unsigned long v, int x) {
int a, b;
    a = (v << x) & -(((unsigned int)x) < 32);
    x = -x;
    b = (v >> x) & -(((unsigned int)x) < 32);
    return a|b;
}

TODO: export(=dllexport) & hidden
TODO: flatten
TODO: warning(msg)
TODO: error(msg)
TODO: leaf (uh), noclone (hmmm)
TODO: nonnull, returns_nonnull
TODO: nothrow
TODO: used
TODO: trap
TODO: http://llvm.org/docs/doxygen/html/Compiler_8h_source.html

TODO: read/write unaligned macros
TODO: htonl and friends
TODO: macro to convert from unsigned to signed "the natural way"
TODO: ecb_static_assert, with message (just like boost), or somesuch, using array-declaration
TODO: alignof


Revision:	1.29
Committed:	Sat Dec 28 08:01:05 2019 UTC (4 years, 4 months ago) by root
Branch:	MAIN
Changes since 1.28:	+4 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.15	TODO:
2			08:30:06 <b_jonas> I think it could be worth to add a macro that works like alignof or _Alignof on sane
3			compilers, and like __alignof on MS compilers that support it, see
4			http://msdn.microsoft.com/en-us/library/45t0s5f4.aspx
5			08:30:24 <b_jonas> even if you can't support it on all the old compilers
6			08:31:17 <b_jonas> I'd also like a macro for alignas, but sadly, that seems impossible in general, because
7			the MS compiler only has some half-attempt to do something similar but with different and
8			more broken semantics, see http://msdn.microsoft.com/en-us/library/83ythb65.aspx
9			08:31:35 <b_jonas> but I wonder if some special case could still be worth to support
10			08:32:23 <b_jonas> probably not, because it would just account to making a union with a highly aligned type,
11			which is something I can do on any compiler portably
12
13			TODO: #define ECB_IS_INTEGRAL(x) !((1 ? 1 : (x)) / 2)
14			#define ECB_IS_INTEGRAL(x) (sizeof ((x) + 1.0f) != sizeof((x) + 1ULL))
15
16	root	1.28	TODO: ecb_minpot, either using bit tricks or ecb_ldXX
17
18			TODO: __builtin_popcountll exists...
19
20			TODO: unaligned access
21
22	root	1.26	TODO: __builtin_powi
23
24	root	1.15	TODO: https://gustedt.wordpress.com/2010/06/08/detect-empty-macro-arguments/
25
26	root	1.13	implement is_constant for c11: https://gustedt.wordpress.com/2013/08/22/testing-compile-time-constness-and-null-pointers-with-c11s-_generic/
27	root	1.12
28			#ifdef _MSC_VER
29
30			#include <stdlib.h>
31			#define bswap_32(x) _byteswap_ulong(x)
32			#define bswap_64(x) _byteswap_uint64(x)
33
34			#elif defined(__APPLE__)
35
36			// Mac OS X / Darwin features
37			#include <libkern/OSByteOrder.h>
38			#define bswap_32(x) OSSwapInt32(x)
39			#define bswap_64(x) OSSwapInt64(x)
40
41			#elif defined(__sun) \|\| defined(sun)
42
43			#include <sys/byteorder.h>
44			#define bswap_32(x) BSWAP_32(x)
45			#define bswap_64(x) BSWAP_64(x)
46
47			#elif defined(__FreeBSD__)
48
49			#include <sys/endian.h>
50			#define bswap_32(x) bswap32(x)
51			#define bswap_64(x) bswap64(x)
52
53			#elif defined(__OpenBSD__)
54
55			#include <sys/types.h>
56			#define bswap_32(x) swap32(x)
57			#define bswap_64(x) swap64(x)
58
59			#elif defined(__NetBSD__)
60
61			#include <sys/types.h>
62			#include <machine/bswap.h>
63			#if defined(__BSWAP_RENAME) && !defined(__bswap_32)
64			#define bswap_32(x) bswap32(x)
65			#define bswap_64(x) bswap64(x)
66			#endif
67
68			#else
69
70			#include <byteswap.h>
71
72			#endif
73
74	root	1.29	0x00010007
75			- new ECB_OPTIMIZE_SIZE symbol.
76
77	root	1.28	0x00010006
78	root	1.29	- new ECB_MEMORY_FENCE_RELAXED memory fence.
79	root	1.28	- use acquire/eelease memory barriers on sun workshop pro, not read/write.
80			- rely on c++ compiler barriers to do the right thing in gcc/clang.
81	root	1.27	- change release memory fence to memory barrier on ia32/ia64.
82	root	1.23	- apply ctz/ld patch for msc by Zsbán Ambrus.
83	root	1.24	- ECB_PTRSIZE erroneously was 8 on most 32bit systems (
84			found by Zsbán Ambrus).
85	root	1.25	- improved compiletime detection of endianness, also, allow
86			runtime detection to indicate other-than-big/little endianness.
87	root	1.26	- no memory barrier neded on arm < 6.
88	root	1.23
89	root	1.22	0x00010005
90			- improve ecb_binary16_to_float.
91			- add ecb_float_to_binary16.
92			- add ecb_binary16_to_binary32 and ecb_binary32_to_binary16 pair.
93
94	root	1.6	0x00010001
95			- add ecb_is_pot32/64.
96			- add intptr_t/uintptr_t.
97			- add ECB_PTRSIZE.
98	root	1.7	- more macros for C/C++ version checks.
99			- support C11 atomics for memory fences.
100			- support gcc-4.7 atomics for memory fences.
101	root	1.10	- support m68k, m88k and sh (patch by Miod Vallat).
102	root	1.11	- add ecb_binary16_to_float.
103	root	1.6
104	root	1.9	TODO: ecb_restrict_array etc. http://ue.tst.eu/5093eafd713ec5fda776d8065070aa4c.txt
105	sf-exg	1.20	TODO: ffs
106	root	1.1	64 bit variants of everything
107	root	1.2	TODO: examples from X for clz/ctz
108	root	1.3	TODO: arithmetic right shift
109			TODO: template/generic functions for x32/x64 and so on
110	root	1.4	TODO: #define ecb_integer_multiples_of(n,d) ((char ()[d])(n) - (char ()[d])0)
111	root	1.3	TODO: generalised shift
112	root	1.8	TODO: #define ECB_FAST_UNALIGNED_ACCESS
113	root	1.3	unsigned long gensh(unsigned long v, int x) {
114			int a, b;
115			a = (v << x) & -(((unsigned int)x) < 32);
116			x = -x;
117			b = (v >> x) & -(((unsigned int)x) < 32);
118			return a\|b;
119			}
120	root	1.14
121	root	1.16	TODO: export(=dllexport) & hidden
122			TODO: flatten
123			TODO: warning(msg)
124			TODO: error(msg)
125	root	1.17	TODO: leaf (uh), noclone (hmmm)
126			TODO: nonnull, returns_nonnull
127			TODO: nothrow
128			TODO: used
129			TODO: trap
130			TODO: http://llvm.org/docs/doxygen/html/Compiler_8h_source.html
131	root	1.16
132	root	1.14	TODO: read/write unaligned macros
133			TODO: htonl and friends
134	sf-exg	1.20	TODO: macro to convert from unsigned to signed "the natural way"
135	root	1.14	TODO: ecb_static_assert, with message (just like boost), or somesuch, using array-declaration
136			TODO: alignof
137
138