For all the IT-People and C-Programmers out there. If you heard this song you will never try to use programming languages other than C again^^ I don't know who wrote the lyrics but I like them :D
Write in C - Let it be Cover - Piano
For all the IT-People and C-Programmers out there. If you heard this song you will never try to use programming languages other than C again^^ I don't know who wrote the lyrics but I like them :D
Q. 1GB ã®æ–‡å—列を strlen ã™ã‚‹ã®ã«å¿…è¦ãªæ™‚é–“ã¯ï¼Ÿ - id:kazuhookuã®ãƒ¡ãƒ¢ç½®ãå ´
1GB ã®æ–‡å—列を strlen ã™ã‚‹ã®ã«å¿…è¦ãªæ™‚é–“ã¯ä½•ç§’ã§ã—ょã†ï¼Ÿã€€ã“ã†ã„ã£ãŸã‚‚ã®ã‚’ã±ã£ã¨äºˆæ¸¬ã§ãã‚‹ã“ã¨ã¯ã€æœ€é©åŒ–ã«å–り組む上ã§å¿…è¦ã‹ãªãã€ã¨æ€ã£ãŸã®ã§ã€è‡ªåˆ†ã®ç†è§£ãŒæ£ã—ã„ã‹ç¢ºèªã™ã‚‹ãŸã‚ã«ã‚‚ã€å®Ÿæ¸¬ã—ã¦ã¿ã¾ã—ãŸã€‚ (以下ã€ç™½åœ°ã«ç™½æ–‡å—ã§æ›¸ã„ã¦ã‚ã‚‹ã®ã§ã€é¸æŠžã—ã¦èªã‚“ã§ãã ã•ã„) 手元㮠Linux (Pentium 4 @ 3GHz / DDR2-667) ã§ã¯ã€ç´„ 0.48 秒 (2.1GB/sec)。GCC ã®çµ„ã¿è¾¼ã¿ç¨‹åº¦ã® strlen ã§ã¯ã€ãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã¯ãƒ¡ã‚¤ãƒ³ãƒ¡ãƒ¢ãƒªã®å¸¯åŸŸã‚ã‚‹ã„ã¯ãƒ¬ã‚¤ãƒ†ãƒ³ã‚·ã§ã¯ãªãã€CPU ã«ãªã‚Šã¾ã™ã€‚ 一方ã€SSE ã§è¨˜è¿°ã•ã‚ŒãŸ strlen *1 を使用ã™ã‚‹ã¨ 0.26 秒 (3.9GB/sec)。ã“ã¡ã‚‰ã¯ãƒ¡ãƒ¢ãƒªå¸¯åŸŸãŒãƒœãƒˆãƒ«ãƒãƒƒã‚¯ã«ãªã£ã¦ã„るよã†ã§ã€æ‰‹å…ƒã® MacBook (Core 2 Duo @ 2GHz / DDR2-667) ã§ã‚‚ã€ã»ã¨ã‚“ã©åŒã˜æ•°å€¤ã«ãªã‚Š
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