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voidy21 id:voidy21

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voidy21 2010/12/21
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voidy21 2010/04/24
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voidy21 2010/04/13
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voidy21 2010/03/13
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voidy21 2010/02/03
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voidy21 2010/01/08
C++

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ã‚ã‚ŠãŒã¡ãƒ€ãƒ¡ãªã‚³ãƒ¼ãƒ‰ã®ãƒ€ãƒ¡ãªç†ç”±ã‚’æ›¸ãã‚³ãƒ¼ãƒŠãƒ¼ã€‚ #include <stdlib.h> #include <math.h> #include <stdio.h> int mysqrt(int x) { if (x < 0) { return 0; } else { return (int)sqrt(x); } } int main() { printf("%d\n", mysqrt(4)); printf("%d\n", mysqrt(1)); printf("%d\n", mysqrt(0)); printf("%d\n", mysqrt(-1)); printf("%f\n", sqrt(4)); printf("%f\n", sqrt(1)); printf("%f\n", sqrt(0)); printf("%f\n", sqrt(-1)); return 0; }ã‚’ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã—
voidy21 2010/01/06
ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°

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voidy21 2009/12/26
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State of the art C compiler optimization tricks, Felix von Leitner, Linux Kongress 2009. æœ€è¿‘ã®ï¼£ã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ãƒ¼ã®æœ€é©åŒ–èƒ½åŠ›ã«ã¤ã„ã¦ã¾ã¨ã‚ãŸãƒ—ãƒ¬ã‚¼ãƒ³ãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ã€‚å®šæ•°ã®æ‰±ã„ã‚„ã‚¤ãƒ³ãƒ©ã‚¤ãƒ³å±•é–‹ãªã©ã®åŸºæœ¬çš„ãªé …ç›®ã‹ã‚‰å§‹ã¾ã£ã¦ï¼Œåˆ†å²ã®å‰Šé™¤ã‚„ãƒ™ã‚¯ãƒˆãƒ«åŒ–ï¼Œ SIMD åŒ–ãªã©ï¼Œæœ€æ–°ã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ãƒ¼ã«æè¼‰ã•ã‚Œã¦ã„ã‚‹æ§˜ã€…ãªæ©Ÿèƒ½ã«ã¤ã„ã¦èª¿ã¹ã¦ã„ã‚‹ã€‚ ã“ã®æ‰‹ã®åˆ†å²ã®å‰Šé™¤ã¯ã»ã¨ã‚“ã©ã®ã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ãƒ¼ã§æœ‰åŠ¹ã‚‰ã—ã„ã€‚ ãƒ™ã‚¯ãƒˆãƒ«åŒ–ã«ã¤ã„ã¦ã¯ gcc ãŒã ã„ã¶é ‘å¼µã£ã¦ã„ã‚‹å°è±¡ã€‚ ã€Œgcc ã¯å…¨ãƒ—ãƒ©ãƒƒãƒˆãƒ•ã‚©ãƒ¼ãƒ ã«ãŠã„ã¦ãƒ“ãƒ‡ã‚ªã‚³ãƒ¼ãƒ‡ãƒƒã‚¯ãƒ—ãƒã‚°ãƒ©ãƒžãƒ¼ã‚ˆã‚Šè³¢ã„ã€ ã“ã‚Œã‚‰ã®æœ€é©åŒ–ãŒå®Ÿéš›ã®ã‚³ãƒ¼ãƒ‰ã§ã©ã®ã‚ˆã†ã«æ©Ÿèƒ½ã™ã‚‹ã‹æ°—ã«ãªã£ã¦é€†ã‚¢ã‚»ãƒ³ãƒ–ãƒªã‚³ãƒ¼ãƒ‰ã‚’è¦—ã„ã¦ã¿ã‚‹äººã‚‚å°‘ãªããªã„ã¨æ€ã†ã‘ã‚Œã©ï¼Œãã‚Œã‚’ä»£ã‚ã‚Šã«ã‚„ã£ã¦ãã‚ŒãŸæ„Ÿã˜ã ã€‚ã“ã®æ‰‹ã®è©±é¡Œã«èˆˆå‘³ãŒã‚ã‚‹äººãªã‚‰ã°ï¼Œç›®ã‚’é€š
voidy21 2009/12/26
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gcc4.3 -O3 on Atom, N=10000ã®æ¡ä»¶ã§æŒ¿å…¥ã‚½ãƒ¼ãƒˆã‚’æ¸¬ã£ãŸçµæžœ(ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã¯ä¸‹ã«)ã€‚æ‰€è¦æ™‚é–“(time)ã‚’æ¸¬ã£ãŸã ã‘ã§ã¯æŒ¯ã‚‹èˆžã„ãŒæŽ´ã‚ãªã„ã®ã§ã€cachegrindã§D1ã‚ãƒ£ãƒƒã‚·ãƒ¥èªã¿å›žæ•°(D1read)ã‚’æ•°ãˆã¦ã¿ãŸã€‚ é–¢æ•° ãƒ¡ãƒ¢ãƒª time D1read yane0 malloc 9.79 62M wkpd0 malloc 9.82 27M yane1 static 8.09 27M wkpd1 static 11.35 28M å¤§è¦æ¨¡ãªã‚½ãƒ¼ãƒˆã¨ã„ã†ã“ã¨ã§mallocã§ç¢ºä¿ã—ãŸãƒ¡ãƒ¢ãƒªã‚’ã‚½ãƒ¼ãƒˆã™ã‚‹å ´åˆã€æœ€é©åŒ–ãŒã‚ˆãåŠ¹ã„ã¦ã„ã‚‹é™ã‚Šã€ã©ã¡ã‚‰ã‚‚ã»ã¼åŒç‰ã®é€Ÿåº¦ã§å‹•ãã‚ˆã†ã ã€‚ ãŸã ã—ã€ã‚„ãç‰ˆã¯staticã«ç¢ºä¿ã—ãŸãƒ¡ãƒ¢ãƒªã‚’ã‚½ãƒ¼ãƒˆã™ã‚‹å ´åˆã€Wikipediaç‰ˆã‚ˆã‚Šã‚‚ç´„3å‰²é€Ÿãå‹•ã„ãŸã€‚ã»ã¼æœ¬äººã®è¨€ã£ã¦ã„ã‚‹é€šã‚Šã®æˆç¸¾ã ã€‚ ã€†ã€‚ ã¨ã¯ã„ãˆã€jã®ã‚ªãƒ•ã‚»ãƒƒãƒˆã‚„ç•ªå…µã®ã‚ã‚Šãªã—ã§20%ãã‚‰ã„
voidy21 2009/12/16
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æ±èŠã¯ï¼Œãƒžãƒ«ãƒã‚³ã‚¢ãƒ»ãƒ—ãƒã‚»ã‚µã€ŒCell Broadband Engineã€ã‚’æè¼‰ã—ãŸåˆã‚ã¦ã®æ¶²æ™¶ãƒ†ãƒ¬ãƒ“ã€ŒCELL REGZA 55X1ã€ã‚’ã„ã‚ˆã„ã‚ˆæ˜Žæ—¥ï¼ˆ2009å¹´12æœˆ10æ—¥ï¼‰ï¼Œç™ºå£²ã—ã¾ã™ã€‚Cellã®é«˜ã„å‡¦ç†æ€§èƒ½ã‚’ç”Ÿã‹ã—ãŸã‚½ãƒ•ãƒˆã‚¦ã‚¨ã‚¢å‡¦ç†ã«ã‚ˆã‚Šï¼Œå¾“æ¥ã®ãƒ†ãƒ¬ãƒ“ã«ã¯ãªã„è±Šå¯Œãªæ©Ÿèƒ½ã‚’å®Ÿç¾ã—ãŸè£½å“ã§ã™ã€‚ ãƒžãƒ«ãƒã‚³ã‚¢ãƒ»ãƒ—ãƒã‚»ã‚µã®æ€§èƒ½ã‚’å¼•ãå‡ºã™ã«ã¯ï¼Œã‚½ãƒ•ãƒˆã‚¦ã‚¨ã‚¢ã‚’ã„ã‹ã«åŠ¹çŽ‡è‰¯ãä¸¦åˆ—å®Ÿè¡Œã•ã›ã‚‰ã‚Œã‚‹ã‹ãŒã‚«ã‚®ã«ãªã‚Šã¾ã™ã€‚ãã“ã§æ±èŠã¯ï¼Œä¸¦åˆ—ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°æŠ€è¡“ã€ŒMolatomiumã€ã‚’ç‹¬è‡ªã«é–‹ç™ºã—ï¼ŒCELL REGZAã«æè¼‰ã—ã¾ã—ãŸã€‚æ—¥çµŒã‚¨ãƒ¬ã‚¯ãƒˆãƒãƒ‹ã‚¯ã‚¹2009å¹´12æœˆ14æ—¥å·ã§ã¯ï¼Œè§£èª¬ã€ŒCELL REGZAãŒæ˜ ã—å‡ºã™æ˜Žæ—¥ã®ãƒ†ãƒ¬ãƒ“ã€ã§CELL REGZAã‚’å¤§ããå–ã‚Šä¸Šã’ã‚‹ã¨ã¨ã‚‚ã«ï¼ŒMolatomiumã®é–‹ç™ºè€…ã®ä¸€äººã§ã‚ã‚‹åŒç¤¾ã®é«˜å±±å¾å¤§æ°ã«è«–æ–‡ã€Œã€ŽCELL REGZAã€ãŒæè¼‰ã™ã‚‹ä¸¦åˆ—åŒ–æŠ€è¡“ã€ŽMolatomiumã€
voidy21 2009/12/16
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malloc(0)ã®è©± - Hello, world! - s21g
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voidy21 2009/11/28
Cè¨€èªž
ãƒªãƒ³ã‚¯
2009-11-18
http://d.hatena.ne.jp/kilrey/20091111#p2ã®è©±ã€‚ function tarai (x, y, z) { if (x <= y) { return y; } else { return tarai(tarai(x-1, y, z), tarai(y-1, z, x), tarai(z-1, x, y)); } }; for (var i = 0; i < 0x10; ++i) { (tarai(12, 6, 0)); } print(tarai(6, 3, 0)); print(tarai(12, 6, 0));goã¨ã‚ˆãä¼¼ã¦ã„ã‚‹â€¦â€¦ã¨æ€ã£ãŸã‚‰å®Ÿè¡Œé€Ÿåº¦ã¾ã§ã»ã¨ã‚“ã©åŒã˜ã ã£ãŸ(8g & 8lã¨æ¯”è¼ƒ)ã€‚ ã‚ã‚ŠãŒã¡ãƒ€ãƒ¡ãªã‚³ãƒ¼ãƒ‰ã®ãƒ€ãƒ¡ãªç†ç”±ã‚’æ›¸ãã‚³ãƒ¼ãƒŠãƒ¼ã€‚ ç¾è±¡ã€‚ C99ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰(tmp.c) #include <stdlib.h> #include <s
voidy21 2009/11/25
Cè¨€èªž
ãƒªãƒ³ã‚¯
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ãƒžã‚¯ãƒ c_assert() ã¯å®šæ•°å¼ã«ã¤ã„ã¦ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«æ™‚ã«ãƒžã‚¯ãƒ assert() ã¨åŒç‰ã®åƒãã‚’ã™ã‚‹ã‚‚ã®ã§ã™ã€‚ ãƒžã‚¯ãƒ c_assert() ã¯å®šæ•°å¼ expression ãŒ å½ ã®å ´åˆã«ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã‚¨ãƒ©ãƒ¼ã‚’ç™ºç”Ÿã•ã›ã¾ã™ã€‚ ãŸã¨ãˆã°æ¬¡ã®ã‚ˆã†ãªå‰ææ¡ä»¶ã‚’æ¤œæŸ»ã§ãã¾ã™ã€‚ // æ˜Žç¤ºçš„ãªç¬¦å·æŒ‡å®šãŒãªã„åž‹ char ã¯ signed char ã¨ä»®å®šã—ãŸ c_assert( is_signed(char) ); // å³ã‚·ãƒ•ãƒˆãŒç®—è¡“ã‚·ãƒ•ãƒˆã§ã‚ã‚‹å‡¦ç†ç³»ã‚’ä»®å®šã—ãŸ c_assert( -1 == (-1 >> 1) ); // 1 ãƒã‚¤ãƒˆãŒ 8 ãƒ“ãƒƒãƒˆã§ã‚ã‚‹å‡¦ç†ç³»ã‚’ä»®å®šã—ãŸ c_assert( 8 == CHAR_BIT ); // åž‹ int ãŒ 32 ãƒ“ãƒƒãƒˆä»¥ä¸Šã§ã‚ã‚‹ã¨ä»®å®šã—ãŸ c_assert( 32 <= (CHAR_BIT * sizeof(int)) ); ãƒžã‚¯ãƒ c_assert()
voidy21 2009/11/25
Cè¨€èªž
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voidy21 2009/11/25
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voidy21 2009/11/23
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