cpu高效編程技術(shù)(更新版)
【正文】 ne LZ4_WILDCOPY(s,d,e) do { LZ4_COPYPACKET(s,d) } while (de)。 } r += (!val)。 } ? Bit運(yùn)算版本 1 int mask = (ab) 31。 分支可能性提示 define likely(expr) expect((expr) != 0, 1) define unlikely(expr) expect((expr) != 0, 0) while likely(ipmatchlimit(STEPSIZE1)) { … } 16 The Blocking Technique 17 The Blocking Technique // Increasing memory usage improves pression ratio // Reduced memory usage can improve speed, due to cache effect // Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache define MEMORY_USAGE 14 define HASH_LOG (MEMORY_USAGE2) define HASHTABLESIZE (1 HASH_LOG) struct refTables { HTYPE hashTable[HASHTABLESIZE]。 ~magic_bits) != 0) { … } } 19 memchr續(xù) { const unsigned char *cp = (const unsigned char *) (longword_ptr 1)。 char *states = erts_sys_alloc(0, … + ERTS_CACHE_LINE_SIZE 1))
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