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a66eebf57c
Several macros such as sint2korr() and uint4korr() are using the arithmetic + operator while a bitwise or operator would suffice. GCC 5 and clang 5 and later can detect patterns consisting of bitwise or and shifts by multiples of 8 bits, such as those used in the InnoDB function mach_read_from_4(). They actually translate that verbose low-level code into high-level machine language (i486 bswap instruction or fused into the Haswell movbe instruction). We should do the same for MariaDB Server code that is outside InnoDB. Note: The Microsoft C compiler is lacking this optimization. There, we might consider using _byteswap_ushort(), _byteswap_ulong(), _byteswap_uint64(). But, those would lead to unaligned reads, which are bad for reasons stated in MDEV-20277. Besides, outside InnoDB, most data is already being stored in the native little-endian format of that compiler.
96 lines
5.1 KiB
C
96 lines
5.1 KiB
C
/* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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Copyright (c) 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/*
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Endianness-independent definitions for architectures other
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than the x86 architecture.
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*/
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#define sint2korr(A) (int16) (((int16) ((uchar) (A)[0])) |\
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((int16) ((int16) (A)[1]) << 8))
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#define sint3korr(A) ((int32) ((((uchar) (A)[2]) & 128) ? \
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(((uint32) 255L << 24) | \
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(((uint32) (uchar) (A)[2]) << 16) |\
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(((uint32) (uchar) (A)[1]) << 8) | \
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((uint32) (uchar) (A)[0])) : \
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(((uint32) (uchar) (A)[2]) << 16) |\
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(((uint32) (uchar) (A)[1]) << 8) | \
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((uint32) (uchar) (A)[0])))
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#define sint4korr(A) (int32) (((int32) ((uchar) (A)[0])) |\
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(((int32) ((uchar) (A)[1]) << 8)) |\
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(((int32) ((uchar) (A)[2]) << 16)) |\
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(((int32) ((int16) (A)[3]) << 24)))
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#define sint8korr(A) (longlong) uint8korr(A)
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#define uint2korr(A) (uint16) (((uint16) ((uchar) (A)[0])) |\
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((uint16) ((uchar) (A)[1]) << 8))
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#define uint3korr(A) (uint32) (((uint32) ((uchar) (A)[0])) |\
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(((uint32) ((uchar) (A)[1])) << 8) |\
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(((uint32) ((uchar) (A)[2])) << 16))
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#define uint4korr(A) (uint32) (((uint32) ((uchar) (A)[0])) |\
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(((uint32) ((uchar) (A)[1])) << 8) |\
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(((uint32) ((uchar) (A)[2])) << 16) |\
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(((uint32) ((uchar) (A)[3])) << 24))
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#define uint5korr(A) ((ulonglong)(((uint32) ((uchar) (A)[0])) |\
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(((uint32) ((uchar) (A)[1])) << 8) |\
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(((uint32) ((uchar) (A)[2])) << 16) |\
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(((uint32) ((uchar) (A)[3])) << 24)) |\
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(((ulonglong) ((uchar) (A)[4])) << 32))
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#define uint6korr(A) ((ulonglong)(((uint32) ((uchar) (A)[0])) | \
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(((uint32) ((uchar) (A)[1])) << 8) | \
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(((uint32) ((uchar) (A)[2])) << 16) | \
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(((uint32) ((uchar) (A)[3])) << 24)) | \
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(((ulonglong) ((uchar) (A)[4])) << 32) | \
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(((ulonglong) ((uchar) (A)[5])) << 40))
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#define uint8korr(A) ((ulonglong)(((uint32) ((uchar) (A)[0])) |\
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(((uint32) ((uchar) (A)[1])) << 8) |\
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(((uint32) ((uchar) (A)[2])) << 16) |\
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(((uint32) ((uchar) (A)[3])) << 24)) |\
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(((ulonglong) (((uint32) ((uchar) (A)[4])) |\
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(((uint32) ((uchar) (A)[5])) << 8) |\
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(((uint32) ((uchar) (A)[6])) << 16) |\
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(((uint32) ((uchar) (A)[7])) << 24))) <<\
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32))
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#define int2store(T,A) do { uint def_temp= (uint) (A) ;\
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*((uchar*) (T))= (uchar)(def_temp); \
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*((uchar*) (T)+1)=(uchar)((def_temp >> 8)); \
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} while(0)
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#define int3store(T,A) do { /*lint -save -e734 */\
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*((uchar*)(T))=(uchar) ((A));\
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*((uchar*) (T)+1)=(uchar) (((A) >> 8));\
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*((uchar*)(T)+2)=(uchar) (((A) >> 16)); \
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/*lint -restore */} while(0)
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#define int4store(T,A) do { *((char *)(T))=(char) ((A));\
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*(((char *)(T))+1)=(char) (((A) >> 8));\
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*(((char *)(T))+2)=(char) (((A) >> 16));\
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*(((char *)(T))+3)=(char) (((A) >> 24));\
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} while(0)
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#define int5store(T,A) do { *((char *)(T))= (char)((A)); \
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*(((char *)(T))+1)= (char)(((A) >> 8)); \
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*(((char *)(T))+2)= (char)(((A) >> 16)); \
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*(((char *)(T))+3)= (char)(((A) >> 24)); \
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*(((char *)(T))+4)= (char)(((A) >> 32)); \
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} while(0)
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#define int6store(T,A) do { *((char *)(T))= (char)((A)); \
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*(((char *)(T))+1)= (char)(((A) >> 8)); \
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*(((char *)(T))+2)= (char)(((A) >> 16)); \
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*(((char *)(T))+3)= (char)(((A) >> 24)); \
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*(((char *)(T))+4)= (char)(((A) >> 32)); \
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*(((char *)(T))+5)= (char)(((A) >> 40)); \
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} while(0)
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#define int8store(T,A) do { uint def_temp= (uint) (A), \
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def_temp2= (uint) ((A) >> 32); \
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int4store((T),def_temp); \
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int4store((T+4),def_temp2);\
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} while(0)
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