Artifact 830442e230d6e8361874333dd11b0fdfa6a993d4ecd835d1b9e1ed1328ca0cf0:
- File
src/OFMacros.h
— part of check-in
[2ff4ae177d]
at
2009-08-31 00:19:41
on branch trunk
— Optimize OF_BSWAP64.
If we have a native OF_BSWAP32, it is still faster to shift and use
OF_BSWAP32 twice rather than having our own OF_BSWAP64. If we don't
have OF_BSWAP32 either, this generates exactly the same code as it did
before, but is much shorter. (user: js, size: 2998) [annotate] [blame] [check-ins using]
/* * Copyright (c) 2008 - 2009 * Jonathan Schleifer <js@webkeks.org> * * All rights reserved. * * This file is part of libobjfw. It may be distributed under the terms of the * Q Public License 1.0, which can be found in the file LICENSE included in * the packaging of this file. */ #ifndef OF_CONFIGURED #error You are missing the libobjfw definitions! #error Please use objfw-config! #endif #include <stdint.h> #ifdef __GNUC__ #define OF_INLINE inline __attribute__((always_inline)) #define OF_LIKELY(cond) __builtin_expect(!!(cond), 1) #define OF_UNLIKELY(cond) __builtin_expect(!!(cond), 0) #else #define OF_INLINE inline #define OF_LIKELY(cond) cond #define OF_UNLIKELY(cond) cond #endif #ifdef __GNUC__ #if defined(__amd64__) || defined(__x86_64__) #define OF_AMD64_ASM #elif defined(__i386__) #define OF_X86_ASM #elif defined(__ppc__) || defined(__PPC__) #define OF_PPC_ASM #endif #endif static OF_INLINE uint16_t OF_BSWAP16(uint16_t i) { #if defined(OF_X86_ASM) || defined(OF_AMD64_ASM) asm("xchgb %h0, %b0" : "=Q"(i) : "Q"(i)); #elif defined(OF_PPC_ASM) asm("lhbrx %0, 0, %1" : "=r"(i) : "r"(&i), "m"(i)); #else i = (i & UINT16_C(0xFF00)) >> 8 | (i & UINT16_C(0x00FF)) << 8; #endif return i; } static OF_INLINE uint32_t OF_BSWAP32(uint32_t i) { #if defined(OF_X86_ASM) || defined(OF_AMD64_ASM) asm("bswap %0" : "=q"(i) : "q"(i)); #elif defined(OF_PPC_ASM) asm("lwbrx %0, 0, %1" : "=r"(i) : "r"(&i), "m"(i)); #else i = (i & UINT32_C(0xFF000000)) >> 24 | (i & UINT32_C(0x00FF0000)) >> 8 | (i & UINT32_C(0x0000FF00)) << 8 | (i & UINT32_C(0x000000FF)) << 24; #endif return i; } static OF_INLINE uint64_t OF_BSWAP64(uint64_t i) { #if defined(OF_AMD64_ASM) asm("bswap %0" : "=r"(i) : "r"(i)); #elif defined(OF_X86_ASM) asm("bswap %%eax\n\t" "bswap %%edx\n\t" "xchgl %%eax, %%edx" : "=A"(i): "A"(i)); #else i = (uint64_t)OF_BSWAP32(i & 0xFFFFFFFF) << 32 | OF_BSWAP32(i >> 32); #endif return i; } static OF_INLINE void OF_BSWAP32_V(uint32_t *buf, size_t len) { while (len--) { *buf = OF_BSWAP32(*buf); buf++; } } #ifdef OF_BIG_ENDIAN #define OF_BSWAP16_IF_BE(i) OF_BSWAP16(i) #define OF_BSWAP32_IF_BE(i) OF_BSWAP32(i) #define OF_BSWAP64_IF_BE(i) OF_BSWAP64(i) #define OF_BSWAP16_IF_LE(i) i #define OF_BSWAP32_IF_LE(i) i #define OF_BSWAP64_IF_LE(i) i #define OF_BSWAP32_V_IF_BE(buf, len) OF_BSWAP32_V(buf, len) #else #define OF_BSWAP16_IF_BE(i) i #define OF_BSWAP32_IF_BE(i) i #define OF_BSWAP64_IF_BE(i) i #define OF_BSWAP16_IF_LE(i) OF_BSWAP16(i) #define OF_BSWAP32_IF_LE(i) OF_BSWAP32(i) #define OF_BSWAP64_IF_LE(i) OF_BSWAP64(i) #define OF_BSWAP32_V_IF_BE(buf, len) #endif #define OF_ROL(val, bits) \ (((val) << (bits)) | ((val) >> (32 - (bits)))) #define OF_HASH_INIT(hash) hash = 0 #define OF_HASH_ADD(hash, byte) \ { \ hash += byte; \ hash += (hash << 10); \ hash ^= (hash >> 6); \ } #define OF_HASH_FINALIZE(hash) \ { \ hash += (hash << 3); \ hash ^= (hash >> 11); \ hash += (hash << 15); \ }