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Commit510b8cb

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Extend & revamp pg_bswap.h infrastructure.
Upcoming patches are going to address performance issues that involveslow system provided ntohs/htons etc. To address that expandpg_bswap.h to provide pg_ntoh{16,32,64}, pg_hton{16,32,64} andoptimize their respective implementations by using compiler intrinsicsfor gcc compatible compilers and msvc. Fall back to manualimplementations using shifts etc otherwise.Additionally remove multiple evaluation hazards from the existingBSWAP32/64 macros, by replacing them with inline functions whennecessary. In the course of that the naming scheme is changed topg_bswap16/32/64.Author: Andres FreundDiscussion:https://postgr.es/m/20170927172019.gheidqy6xvlxb325@alap3.anarazel.de
1 parent0008a10 commit510b8cb

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8 files changed

+159
-27
lines changed

8 files changed

+159
-27
lines changed

‎config/c-compiler.m4

Lines changed: 17 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -224,6 +224,23 @@ AC_DEFINE(HAVE__BUILTIN_TYPES_COMPATIBLE_P, 1,
224224
fi])# PGAC_C_TYPES_COMPATIBLE
225225

226226

227+
# PGAC_C_BUILTIN_BSWAP16
228+
# -------------------------
229+
# Check if the C compiler understands __builtin_bswap16(),
230+
# and define HAVE__BUILTIN_BSWAP16 if so.
231+
AC_DEFUN([PGAC_C_BUILTIN_BSWAP16],
232+
[AC_CACHE_CHECK(for__builtin_bswap16,pgac_cv__builtin_bswap16,
233+
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
234+
[static unsigned long int x = __builtin_bswap16(0xaabb);]
235+
)],
236+
[pgac_cv__builtin_bswap16=yes],
237+
[pgac_cv__builtin_bswap16=no])])
238+
if test x"$pgac_cv__builtin_bswap16" = xyes ; then
239+
AC_DEFINE(HAVE__BUILTIN_BSWAP16,1,
240+
[Define to 1 if your compiler understands __builtin_bswap16.])
241+
fi])# PGAC_C_BUILTIN_BSWAP16
242+
243+
227244

228245
# PGAC_C_BUILTIN_BSWAP32
229246
# -------------------------

‎configure

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -11816,6 +11816,30 @@ if test x"$pgac_cv__types_compatible" = xyes ; then
1181611816

1181711817
$as_echo"#define HAVE__BUILTIN_TYPES_COMPATIBLE_P 1">>confdefs.h
1181811818

11819+
fi
11820+
{$as_echo"$as_me:${as_lineno-$LINENO}: checking for __builtin_bswap16">&5
11821+
$as_echo_n"checking for __builtin_bswap16...">&6; }
11822+
if${pgac_cv__builtin_bswap16+:}false;then:
11823+
$as_echo_n"(cached)">&6
11824+
else
11825+
cat confdefs.h -<<_ACEOF >conftest.$ac_ext
11826+
/* end confdefs.h. */
11827+
static unsigned long int x = __builtin_bswap16(0xaabb);
11828+
11829+
_ACEOF
11830+
if ac_fn_c_try_compile"$LINENO";then:
11831+
pgac_cv__builtin_bswap16=yes
11832+
else
11833+
pgac_cv__builtin_bswap16=no
11834+
fi
11835+
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
11836+
fi
11837+
{$as_echo"$as_me:${as_lineno-$LINENO}: result:$pgac_cv__builtin_bswap16">&5
11838+
$as_echo"$pgac_cv__builtin_bswap16">&6; }
11839+
iftest x"$pgac_cv__builtin_bswap16" = xyes;then
11840+
11841+
$as_echo"#define HAVE__BUILTIN_BSWAP16 1">>confdefs.h
11842+
1181911843
fi
1182011844
{$as_echo"$as_me:${as_lineno-$LINENO}: checking for __builtin_bswap32">&5
1182111845
$as_echo_n"checking for __builtin_bswap32...">&6; }

‎configure.in

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1306,6 +1306,7 @@ PGAC_C_FUNCNAME_SUPPORT
13061306
PGAC_C_STATIC_ASSERT
13071307
PGAC_C_TYPEOF
13081308
PGAC_C_TYPES_COMPATIBLE
1309+
PGAC_C_BUILTIN_BSWAP16
13091310
PGAC_C_BUILTIN_BSWAP32
13101311
PGAC_C_BUILTIN_BSWAP64
13111312
PGAC_C_BUILTIN_CONSTANT_P

‎contrib/btree_gist/btree_uuid.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -182,8 +182,8 @@ uuid_2_double(const pg_uuid_t *u)
182182
* machine, byte-swap each half so we can use native uint64 arithmetic.
183183
*/
184184
#ifndefWORDS_BIGENDIAN
185-
uu[0]=BSWAP64(uu[0]);
186-
uu[1]=BSWAP64(uu[1]);
185+
uu[0]=pg_bswap64(uu[0]);
186+
uu[1]=pg_bswap64(uu[1]);
187187
#endif
188188

189189
/*

‎src/include/pg_config.h.in

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -668,6 +668,9 @@
668668
/* Define to 1 if you have the <winldap.h> header file. */
669669
#undef HAVE_WINLDAP_H
670670

671+
/* Define to 1 if your compiler understands __builtin_bswap16. */
672+
#undef HAVE__BUILTIN_BSWAP16
673+
671674
/* Define to 1 if your compiler understands __builtin_bswap32. */
672675
#undef HAVE__BUILTIN_BSWAP32
673676

‎src/include/pg_config.h.win32

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -493,6 +493,9 @@
493493
/* Define to 1 if you have the <winldap.h> header file. */
494494
/* #undef HAVE_WINLDAP_H */
495495

496+
/* Define to 1 if your compiler understands __builtin_bswap16. */
497+
/* #undef HAVE__BUILTIN_BSWAP16 */
498+
496499
/* Define to 1 if your compiler understands __builtin_bswap32. */
497500
/* #undef HAVE__BUILTIN_BSWAP32 */
498501

‎src/include/port/pg_bswap.h

Lines changed: 108 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -3,15 +3,13 @@
33
* pg_bswap.h
44
* Byte swapping.
55
*
6-
* Macros for reversing the byte order of32-bit and 64-bit unsigned integers.
6+
* Macros for reversing the byte order of16, 32 and 64-bit unsigned integers.
77
* For example, 0xAABBCCDD becomes 0xDDCCBBAA. These are just wrappers for
88
* built-in functions provided by the compiler where support exists.
9-
* Elsewhere, beware of multiple evaluations of the arguments!
109
*
11-
* Note that the GCC built-in functions __builtin_bswap32() and
12-
* __builtin_bswap64() are documented as accepting single arguments of type
13-
* uint32_t and uint64_t respectively (these are also the respective return
14-
* types). Use caution when using these wrapper macros with signed integers.
10+
* Note that all of these functions accept unsigned integers as arguments and
11+
* return the same. Use caution when using these wrapper macros with signed
12+
* integers.
1513
*
1614
* Copyright (c) 2015-2017, PostgreSQL Global Development Group
1715
*
@@ -22,28 +20,114 @@
2220
#ifndefPG_BSWAP_H
2321
#definePG_BSWAP_H
2422

25-
#ifdefHAVE__BUILTIN_BSWAP32
26-
#defineBSWAP32(x) __builtin_bswap32(x)
23+
24+
/* In all supported versions msvc provides _byteswap_* functions in stdlib.h */
25+
#ifdef_MSC_VER
26+
#include<stdlib.h>
27+
#endif
28+
29+
30+
/* implementation of uint16 pg_bswap16(uint16) */
31+
#if defined(HAVE__BUILTIN_BSWAP16)
32+
33+
#definepg_bswap16(x) __builtin_bswap16(x)
34+
35+
#elif defined(_MSC_VER)
36+
37+
#definepg_bswap16(x) _byteswap_ushort(x)
38+
39+
#else
40+
41+
staticinlineuint16
42+
pg_bswap16(uint16x)
43+
{
44+
return
45+
((x <<8)&0xff00) |
46+
((x >>8)&0x00ff);
47+
}
48+
49+
#endif/* HAVE__BUILTIN_BSWAP16 */
50+
51+
52+
/* implementation of uint32 pg_bswap32(uint32) */
53+
#if defined(HAVE__BUILTIN_BSWAP32)
54+
55+
#definepg_bswap32(x) __builtin_bswap32(x)
56+
57+
#elif defined(_MSC_VER)
58+
59+
#definepg_bswap32(x) _byteswap_ulong(x)
60+
2761
#else
28-
#defineBSWAP32(x) ((((x) << 24) & 0xff000000) | \
29-
(((x) << 8) & 0x00ff0000) | \
30-
(((x) >> 8) & 0x0000ff00) | \
31-
(((x) >> 24) & 0x000000ff))
62+
63+
staticinlineuint32
64+
pg_bswap32(uint32x)
65+
{
66+
return
67+
((x <<24)&0xff000000) |
68+
((x <<8)&0x00ff0000) |
69+
((x >>8)&0x0000ff00) |
70+
((x >>24)&0x000000ff);
71+
}
72+
3273
#endif/* HAVE__BUILTIN_BSWAP32 */
3374

34-
#ifdefHAVE__BUILTIN_BSWAP64
35-
#defineBSWAP64(x) __builtin_bswap64(x)
75+
76+
/* implementation of uint64 pg_bswap64(uint64) */
77+
#if defined(HAVE__BUILTIN_BSWAP64)
78+
79+
#definepg_bswap64(x) __builtin_bswap64(x)
80+
81+
82+
#elif defined(_MSC_VER)
83+
84+
#definepg_bswap64(x) _byteswap_uint64(x)
85+
3686
#else
37-
#defineBSWAP64(x) ((((x) << 56) & UINT64CONST(0xff00000000000000)) | \
38-
(((x) << 40) & UINT64CONST(0x00ff000000000000)) | \
39-
(((x) << 24) & UINT64CONST(0x0000ff0000000000)) | \
40-
(((x) << 8) & UINT64CONST(0x000000ff00000000)) | \
41-
(((x) >> 8) & UINT64CONST(0x00000000ff000000)) | \
42-
(((x) >> 24) & UINT64CONST(0x0000000000ff0000)) | \
43-
(((x) >> 40) & UINT64CONST(0x000000000000ff00)) | \
44-
(((x) >> 56) & UINT64CONST(0x00000000000000ff)))
87+
88+
staticinlineuint16
89+
pg_bswap64(uint16x)
90+
{
91+
return
92+
((x <<56)&UINT64CONST(0xff00000000000000)) |
93+
((x <<40)&UINT64CONST(0x00ff000000000000)) |
94+
((x <<24)&UINT64CONST(0x0000ff0000000000)) |
95+
((x <<8)&UINT64CONST(0x000000ff00000000)) |
96+
((x >>8)&UINT64CONST(0x00000000ff000000)) |
97+
((x >>24)&UINT64CONST(0x0000000000ff0000)) |
98+
((x >>40)&UINT64CONST(0x000000000000ff00)) |
99+
((x >>56)&UINT64CONST(0x00000000000000ff));
100+
}
45101
#endif/* HAVE__BUILTIN_BSWAP64 */
46102

103+
104+
/*
105+
* Portable and fast equivalents for for ntohs, ntohl, htons, htonl,
106+
* additionally extended to 64 bits.
107+
*/
108+
#ifdefWORDS_BIGENDIAN
109+
110+
#definepg_hton16(x)(x)
111+
#definepg_hton32(x)(x)
112+
#definepg_hton64(x)(x)
113+
114+
#definepg_ntoh16(x)(x)
115+
#definepg_ntoh32(x)(x)
116+
#definepg_ntoh64(x)(x)
117+
118+
#else
119+
120+
#definepg_hton16(x)pg_bswap16(x)
121+
#definepg_hton32(x)pg_bswap32(x)
122+
#definepg_hton64(x)pg_bswap64(x)
123+
124+
#definepg_ntoh16(x)pg_bswap16(x)
125+
#definepg_ntoh32(x)pg_bswap32(x)
126+
#definepg_ntoh64(x)pg_bswap64(x)
127+
128+
#endif/* WORDS_BIGENDIAN */
129+
130+
47131
/*
48132
* Rearrange the bytes of a Datum from big-endian order into the native byte
49133
* order. On big-endian machines, this does nothing at all. Note that the C
@@ -60,9 +144,9 @@
60144
#defineDatumBigEndianToNative(x)(x)
61145
#else/* !WORDS_BIGENDIAN */
62146
#ifSIZEOF_DATUM==8
63-
#defineDatumBigEndianToNative(x)BSWAP64(x)
147+
#defineDatumBigEndianToNative(x)pg_bswap64(x)
64148
#else/* SIZEOF_DATUM != 8 */
65-
#defineDatumBigEndianToNative(x)BSWAP32(x)
149+
#defineDatumBigEndianToNative(x)pg_bswap32(x)
66150
#endif/* SIZEOF_DATUM == 8 */
67151
#endif/* WORDS_BIGENDIAN */
68152

‎src/include/port/pg_crc32c.h

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -73,7 +73,7 @@ extern pg_crc32c (*pg_comp_crc32c) (pg_crc32c crc, const void *data, size_t len)
7373
#defineCOMP_CRC32C(crc,data,len) \
7474
((crc) = pg_comp_crc32c_sb8((crc), (data), (len)))
7575
#ifdefWORDS_BIGENDIAN
76-
#defineFIN_CRC32C(crc) ((crc) =BSWAP32(crc) ^ 0xFFFFFFFF)
76+
#defineFIN_CRC32C(crc) ((crc) =pg_bswap32(crc) ^ 0xFFFFFFFF)
7777
#else
7878
#defineFIN_CRC32C(crc) ((crc) ^= 0xFFFFFFFF)
7979
#endif

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