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gfx id:gfx

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gfx 2019/09/27
UB

C
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ã‚µã‚¤ãƒœã‚¦ã‚ºãƒ»ãƒ©ãƒœã®å…‰æˆã§ã™ã€‚ ä»Šå›žã¯C/C++ç”¨æ–‡å—æ¤œç´¢ãƒ©ã‚¤ãƒ–ãƒ©ãƒªmie_stringã‚’ç´¹ä»‹ã—ã¾ã™ã€‚ mie_stringã¯ãƒ†ã‚ã‚¹ãƒˆã®ä¸ã‹ã‚‰è¤‡æ•°æ–‡å—ã®ã„ãšã‚Œã‹ãŒå˜åœ¨ã™ã‚‹å ´æ‰€ã‚’é«˜é€Ÿã«æ¤œç´¢ã™ã‚‹é–¢æ•°ã‚’æä¾›ã—ã¾ã™ã€‚ æœ¬æ–‡ã§ã¯ãã®ä½¿ã„æ–¹ã¨æ€§èƒ½ã‚’ç´¹ä»‹ã—ã¾ã™ã€‚ã¾ãŸå¾ŒåŠã§ã¯SIMDå‘½ä»¤ã‚’ä½¿ã†ã¨ãã«æ‚©ã¾ã—ã„ç«¯æ•°å‡¦ç†ã«ã¤ã„ã¦è©³è§£ã—ã¾ã™ã€‚ æº–å‚™ mie_stringã§ã¯Cã®intrinsicé–¢æ•°ï¼ˆSSE4.2ï¼‰ã‚’ä½¿ã£ãŸã‚‚ã®ã¨ã‚¢ã‚»ãƒ³ãƒ–ãƒªè¨€èªžã§æ›¸ã„ãŸã‚‚ã®ã®äºŒã¤ã‚’ç”¨æ„ã—ã¾ã—ãŸã€‚ intrinsicé–¢æ•°ã‚’ä½¿ã†å ´åˆã¯MIE_STRING_INLINEã‚’å®šç¾©ã—ã¦ã‹ã‚‰mie_string.hã‚’includeã—ã¦ãã ã•ã„ã€‚ ã“ã‚Œä»¥å¤–ã®ãƒ•ã‚¡ã‚¤ãƒ«ã¯ä¸è¦ã§ã™ã€‚C/C++ã®ã©ã¡ã‚‰ã‹ã‚‰ã‚‚ä½¿ãˆã¾ã™ã€‚ includeã™ã‚‹ã ã‘ã§ã¤ã‹ãˆã‚‹ã®ã§ç°¡å˜ã§ã™ãã€‚ ãªãŠã€ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã‚ªãƒ—ã‚·ãƒ§ãƒ³ã«ã¯gcc/clangãªã‚‰-msse42ã‚„-mavxã€Visua
gfx 2016/08/25
C

SSE

string
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Notes on Programming in C - bell labs - pikestyle | /sys/doc/ Documentation archive
Rob Pike February 21, 1989 Introduction Kernighan and Plauger's The Elements of Programming Style was an important and rightly influential book.Â But sometimes I feel its concise rules were taken as a cookbook approach to good style instead of the succinct expression of a philosophy they were meant to be.Â If the book claims that variable names should be chosen meaningfully, doesn't it then follow
gfx 2014/10/13
C
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Kazuho's Weblog: Making the HTTP server run 20% faster by using qrintf-gcc; a sprintf-optimizing preprocessor / compiler
Making the HTTP server run 20% faster by using qrintf-gcc; a sprintf-optimizing preprocessor / compiler tl;dr This is an initial release announcement of qrintf, a preprocessor (and qrintf-gcc is the compiler frontend) that optimizes calls to sprintf and snprintf. C programs calling the functions may run faster by using the preprocessor / compiler in place of the standard compiler toolchain. Backgr
gfx 2014/10/07
C

printf
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Goã®ãƒ„ãƒ¼ãƒ«ãƒã‚§ã‚¤ãƒ³ã®Cã‚³ãƒ³ãƒ‘ã‚¤ãƒ©ã‚’ä½¿ã† - moriyoshiã®æ—¥è¨˜
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gfx 2013/12/26
go

c
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gfx 2013/01/18
backtrace

C
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gfx 2012/11/12
C

tkihira
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Success is a Journey, not a Destination: å…¨ã¦ã®Cãƒ—ãƒã‚°ãƒ©ãƒžãŒæœªå®šç¾©ãªæŒ¯ã‚‹èˆžã„ã«ã¤ã„ã¦çŸ¥ã£ã¦ãŠãã¹ãã“ã¨ #1/3
[What Every C Programmer Should Know About Undefined Behavior #1/3Â ã®ç¿»è¨³ã§ã™ã€‚] LLVMã§ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã—ãŸã‚³ãƒ¼ãƒ‰ã¯ã€æœ€é©åŒ–ã‚’æœ‰åŠ¹ã«ã—ã¦ã„ã‚‹ã¨ãŸã¾ã«SIGTRAPã‚·ã‚°ãƒŠãƒ«ã‚’ç”Ÿæˆã™ã‚‹ã®ã¯ãªãœãªã®ã‹ã€ã¨èžã‹ã‚Œã‚‹ã“ã¨ãŒã‚ã‚‹ã€‚ã„ã‚ã„ã‚èª¿ã¹ãŸã‚ã¨ã€(X86ã§ã®è©±ã ãŒ) Clangã¯ "ud2" ã‚¤ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚·ãƒ§ãƒ³ã‚’ç”Ÿæˆã—ã¦ã„ãŸã“ã¨ãŒã‚ã‹ã£ãŸã€‚"ud2" ã¯__builtin_trap()ãŒç”Ÿæˆã™ã‚‹ã‚¤ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚·ãƒ§ãƒ³ã¨åŒã˜ã‚‚ã®ã ã€‚[è¨³æ³¨: #UDä¾‹å¤–ã‚’ç™ºç”Ÿã•ã›ã‚‹å‘½ä»¤ã€‚ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ãŒ#UDä¾‹å¤–ã‚’ãƒãƒ³ãƒ‰ãƒ«ã§ãã¦ã„ã‚‹ã‹ãƒ†ã‚¹ãƒˆã™ã‚‹ãŸã‚ã«ä½¿ã‚ã‚Œã‚‹ã€‚ã¤ã¾ã‚Šã€ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ãŒæœªå®šç¾©ãªæŒ¯ã‚‹èˆžã„ã‚’ä½¿ã£ã¦ã„ãŸã‹ã‚‰ã€LLVMã¯ud2ã‚¤ãƒ³ã‚¹ãƒˆãƒ©ã‚¯ã‚·ãƒ§ãƒ³ã‚’ç”Ÿæˆã—ãŸã®ã§ã‚ã£ã¦ã€LLVMã®ãƒã‚°ã§ã¯ãªã„ã€ã¨ã„ã†ã“ã¨] ã“ã†ã„ã†å•é¡Œã¯å¹¾ã¤ã‹ã‚ã£ã¦ã€ã™ã¹ã¦ã€Cã®æœªå®šç¾©ãªæŒ¯ã‚‹
gfx 2012/02/01
C

llvm
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Should volatile acquire atomicity and thread visibility semantics?
Should volatile Acquire Atomicity and Thread Visibility Semantics? Traditionally, the semantics of C's and C++'s volatile keyword have been unclear. In particular, these languages state that operations are "evaluated strictly according to the rules of the abstract machine" (C99, 6.7.3-6) But, at least in the pthread context, this has generally not been interpreted to apply to inter-thread visibili
gfx 2011/11/13
C

volatile

thread
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ãƒã‚¤ãƒ³ã‚¿å®£è¨€ã®*è¨˜å·ã€å·¦å¯„ã›æ´¾? å³å¯„ã›æ´¾?
C/C++ã§ãƒã‚¤ãƒ³ã‚¿å¤‰æ•°ã‚’å®£è¨€ã™ã‚‹ã¨ãã®*è¨˜å·ã‚’int* a;ã®ã‚ˆã†ã«å·¦å¯„ã›ã§æ›¸ãã‹ã€int *a;ã®ã‚ˆã†ã«å³å¯„ã›ã§æ›¸ãã‹ã€‚ å³å¯„ã›ã§æ›¸ãå ´åˆã€ã€ŒCã§ã¯å®£è¨€ã¨ä½¿ç”¨ã®æ–‡æ³•ã‚’ä¸€è‡´ã•ã›ã‚‹ã€ã¨ã„ã†è¦å‰‡ã‹ã‚‰è€ƒãˆã‚Œã°ç´ ç›´ã«è§£é‡ˆã§ãã‚‹ã¨ã„ã†è©±ã€‚
gfx 2011/10/12
C
ãƒªãƒ³ã‚¯
Deep C
Programming is hard. Programming correct C and C++ is particularly hard. Indeed, both in C and certainly in C++, it is uncommon to see a screenful containing only well defined and conforming code.Why do professional programmers write code like this? Because most programmers do not have a deep understanding of the language they are using.While they sometimes know that certain things are undefined o
gfx 2011/10/11
C

spec
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Cyclone (programming language) - Wikipedia
The Cyclone programming language was intended to be a safe dialect of the C language.[2] It avoids buffer overflows and other vulnerabilities that are possible in C programs by design, without losing the power and convenience of C as a tool for system programming. It is no longer supported by its original developers, with the reference tooling not supporting 64-bit platforms. The Rust language is
gfx 2011/07/04
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