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__builtin_expectã®åŠ¹åŠ› - åˆå¦è€…ã®ç®¸ç½®
RLogã‚’ã„ã˜ã£ã¦ã¦çŸ¥ã£ãŸ__builtin_expectを試ã—ã¦ã¿ãŸã€‚__builtin_expectã¯ã‚ã‚‹å¼ãŒã»ã¨ã‚“ã©ã®å ´åˆã«æ±ºã¾ã£ãŸå®šæ•°ã«ãªã‚‹ã€ã¨è¨€ã†å ´åˆã«åˆ†å²äºˆæ¸¬ã®ãƒ’ントãªã©ã‚’与ãˆã¦é«˜é€ŸåŒ–を計るãŸã‚ã®gccディレクティブã ãã†ãªã€‚ RLogã¯dormant(ä¼‘çœ )状態ã®ãƒã‚°ãƒ•ã‚¡ã‚·ãƒªãƒ†ã‚£ã«æœ€é©åŒ–ã—ã¦ã‚ã£ã¦ã€ãƒ—ãƒãƒ€ã‚¯ã‚·ãƒ§ãƒ³ã‚³ãƒ¼ãƒ‰ã«ãƒã‚°ã‚³ãƒ¼ãƒ‰ã‚’残ã—ã£ã±ãªã—ã§ã‚‚ã•ã»ã©ãƒ‡ã‚°ãƒ¬ã—ãªã„ã®ãŒå£²ã‚Šãªã‚“ã ã‘ã©ã€ãã®ã‚«ãƒ©ã‚¯ãƒªãŒã“れ。 ã§ã€RLog自身ã«ã¤ã„ã¦ã¯ã‚ã¨ã§æ›¸ã。 ã©ã†ã‹ã？ 具体的ã«ã¯ __builtin_expect(A,B)ã¨æ›¸ã„ãŸå ´åˆ AãŒå®šæ•° Bã§ã‚る事を期待ã™ã‚‹ã€ã¨ã„ã†ãƒ’ãƒ³ãƒˆæƒ…å ±ã«ãªã‚‹ã€‚ 例ãˆã°ã€æ¯”較演算åãŒã»ã¨ã‚“ã©ã®å ´åˆæˆã‚Šç«‹ãŸãªã„ã€ã¨è¨€ã†å ´åˆ __builtin_expect(, 0)　ã¨ãªã‚‹ã€‚ #include <stdio.h> #ifdef EXPECT #define E
GCC Python plugin — gcc-python-plugin 0.16 documentation
This document describes the Python plugin I’ve written for GCC. In theory the plugin allows you to write Python scripts that can run inside GCC as it compiles code, exposing GCC’s internal data structures as a collection of Python classes and functions. The bulk of the document describes the Python API it exposes. Hopefully this will be of use for writing domain-specific warnings, static analysers
Plugins (GNU Compiler Collection (GCC) Internals)
23 Plugins ¶ GCC plugins are loadable modules that provide extra features to the compiler. Like GCC itself they can be distributed in source and binary forms. GCC plugins provide developers with a rich subset of the GCC API to allow them to extend GCC as they see fit. Whether it is writing an additional optimization pass, transforming code, or analyzing information, plugins can be quite useful. Lo
Homebrewã§æœ€æ–°ã®GCC ( gcc-4.6.2 ) をインストールã™ã‚‹ãŸã‚ã®ãƒ‘ッãƒã‚’書ã„ã¦ã¿ãŸ - ã¯ã‚„ãプãƒã‚°ãƒ©ãƒ ã«ãªã‚ŠãŸã„
最近Macã®ãƒ‘ッケージ管ç†ã‚·ã‚¹ãƒ†ãƒ を色々使ã£ã¦ã¿ã¦ã„ã¦ï¼Œãã®ä¸€ç’°ã§Homebrewを使ã£ã¦ã¿ãŸã‚Šãªã©ã—ã¾ã—ãŸï¼Ž Homebrewã«ã¯gccã®ãƒ‘ッケージãŒè¦‹å½“ãŸã‚‰ãªã‹ã£ãŸã®ã§æ¤œç´¢ã—ã¦ã¿ãŸã¨ã“ã‚， homebrew-altã¨ã„ã†ãƒªãƒã‚¸ãƒˆãƒªã«æ¯”較的新ã—ã‚ã®gcc-4.6.0ã®FormulaãŒã‚ã‚Šã¾ã—ãŸï¼Ž 404 · GitHub ã¾ã‚ã—ã‹ã—，最新版ã®gccを追ã£ã¦ã„ã£ã¦ã‚‹äººã¯ãã‚Œãªã‚Šã«ã”å˜çŸ¥ã ã¨ã¯æ€ã„ã¾ã™ãŒï¼Œgcc-4.6.0ã¯ãƒã‚°ã¨ã‹è‰²ã€…アレãªã®ã§ï¼Œã©ã†ã›ãªã‚‰ã¤ã„先日出ãŸ4.6.2をインストールã—ãŸã„ã¨ã„ã†ã“ã¨ã§ï¼Œä¸Šè¨˜ã®ãƒ•ã‚¡ã‚¤ãƒ«ã‚’gcc-4.6.2ã«å¯¾å¿œã•ã›ã‚‹ãƒ‘ッãƒã‚’書ãã¾ã—ãŸï¼Ž https://github.com/rhysd/others/blob/master/gcc4.6.0-to-gcc4.6.2.patch 使ã„æ–¹ã¯ä¸Šè¨˜ã®ã‚µã‚¤ãƒˆã‹ã‚‰ãã‚Œãžã‚Œgcc.rbã¨gcc4.6.0-to-gc
An introduction to creating GCC plugins [LWN.net]
September 27, 2011 This article was contributed by Matt Davis The free and open source community is largely based on extensibility, sharing, and modularity, so projects will often provide an API that allows users to add functionality. One way to accomplish that is via plugins to the base project, which allows a user to customize the project to their needs and easily share the result with others wh
GCCã®ã‚³ãƒ³ãƒ‘イルオプションã§é–¢æ•°ãƒˆãƒ¬ãƒ¼ã‚µ - torutkã®ãƒ–ãƒã‚°
ã“ã®æœ¬ã®ã€Œ#77 関数ã¸ã®enter/exitをフックã™ã‚‹ã€ã§ã€GCCã®ã‚³ãƒ³ãƒ‘イルオプション-finstrument-functionsを使ã„ã€é–¢æ•°ãŒå‘¼ã³å‡ºã•ã‚ŒãŸæ™‚ã€é–¢æ•°ã‹ã‚‰å¾©å¸°ã™ã‚‹ã¨ãã«ãƒ•ãƒƒã‚¯ã‚’入れる方法ãŒç´¹ä»‹ã•ã‚Œã¦ã„ã¾ã™ã€‚フック関数ã®ã‚·ã‚°ãƒ‹ãƒãƒ£ã¯ä»¥ä¸‹ã§ã™ã€‚ void __cyg_profile_func_enter(void* func_addr, void* call_site); void __cyg_profile_func_exit(void* func_addr, void* call_site); ã“ã®ãƒ•ãƒƒã‚¯å‡¦ç†ã«æ¸¡ã•ã‚Œã‚‹ã‚¢ãƒ‰ãƒ¬ã‚¹ã‹ã‚‰é–¢æ•°åを出ã—ã¦ã€é–¢æ•°ã®å®Ÿè¡Œã‚’追ã†ç°¡æ˜“ãªé–¢æ•°ãƒˆãƒ¬ãƒ¼ã‚µã‚’作æˆã—ã¾ã™ã€‚アドレスã‹ã‚‰é–¢æ•°ã«å¤‰æ›ã™ã‚‹æ–¹æ³•ã§ä¸€ç•ªç°¡å˜ãã†ãªã®ã¯ã€åŒã˜æœ¬ã®ã€Œ#62 dlopenã§å®Ÿè¡Œæ™‚ã«å‹•çš„リンクã™ã‚‹ã€ã§glibcã®GNUæ‹¡å¼µã¨ã—ã¦ç´¹ä»‹ã•ã‚Œã¦ã„ã‚‹dladdr関数ã§ã™ã€‚ #i
Benchmarks between Clang and GCC about Ruby 1.9.3
Blogged by Ujihisa. Standard methods of programming and thoughts including Clojure, Vim, LLVM, Haskell, Ruby and Mathematics written by a Japanese programmer. github/ujihisa Since Matz Ruby Implimentation ruby 1.9.3 has been released as preview release, I think that all Rubyists should abandon the ruby they are usually using, ruby 1.9.2, and should use 1.9.3 now. Ruby 1.9.3 also supports clang ins
ビットシフトã®è½ã¨ã—ç©´ - 算術シフトã¨è«–ç†ã‚·ãƒ•ãƒˆ - è·æ¥ã¨ã—ã¦ã®ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°
C言語ã«ã¯ã€ãƒ“ットシフト演算åã¨ã„ã†ã‚‚ã®ãŒã‚ã‚Šã¾ã™ã€‚左シフト演算å(<<)ã¨å³ã‚·ãƒ•ãƒˆæ¼”ç®—å(>>)ã§ã™ã€‚åŒã˜ãƒ“ット演算ã§ã‚‚ã€ãƒ“ットå˜ä½ã®è«–ç†å’Œ(|)ã‚„è«–ç†ç©(&)ã€NOT(~)ç‰ã¯ã®æ–¹ã¯ã€ãƒ•ãƒ©ã‚°åž‹ã®å¤‰æ•°ã®å‡¦ç†ã§ä½¿ã‚れる事ãŒå¤šã„æ°—ãŒã—ã¾ã™ãŒã€ãƒ“ットシフトã®æ–¹ã¯ä½¿ç”¨ã•ã‚Œã‚‹ã‚±ãƒ¼ã‚¹ã¯ã‚ã¾ã‚Šãªã„ã‹ã‚‚ã—ã‚Œã¾ã›ã‚“。 ã•ã¦ã€ã“ã®ãƒ“ットシフト演算åã§æ™‚々å•é¡Œã«ãªã‚‹ã®ãŒã€ç¬¦å·ãƒ“ットãŒç«‹ã£ã¦ã„る時ã®å³ã‚·ãƒ•ãƒˆæ¼”ç®—ã§ã™ã€‚見逃ã•ã‚ŒãŒã¡ãªãƒã‚¤ãƒ³ãƒˆã¯ã€ åž‹ã«ã‚ˆã£ã¦æŒ™å‹•(算術シフトã‹è«–ç†ã‚·ãƒ•ãƒˆã‹)ãŒã‹ã‚ã‚‹ã“ã¨ãŒã‚ã‚‹ C言語ã®è¦æ ¼ã¨ã—ã¦ã€ç®—術シフトã‹è«–ç†ã‚·ãƒ•ãƒˆã‹ã¯ä¸å®š Nbitã®ç®—術シフトã¨2ã®Nä¹—ã§ã®é™¤ç®—ã¯ç‰ä¾¡ã§ã¯ãªã„ ã¨ã„ã£ãŸã¨ã“ã‚ã«ã‚ã‚Šã¾ã™ã€‚ 算術シフト(shift arithmetic)ã¨è«–ç†ã‚·ãƒ•ãƒˆ(shift logical:åˆã¯0充填シフト)ã¨ã„ã†è¨€è‘‰ã‚’ã”å˜çŸ¥ãªã„æ–¹ã®ãŸã‚ã«ã¡ã‚‡ã£ã¨èª¬æ˜Žã‚’書ã„ã¦ãŠãã¨ã€ã‚·ãƒ•ãƒˆã«ã‚ˆã£
while(1){LOVE++;}を最é©åŒ– - duost
最近ツイッター㧠"while(1){LOVE++}"ã¨æ›¸ãè¾¼ã¾ã‚Œã¦ã‚‹æŒ‡è¼ªãŒã‚ã£ã¦ã€ ãã®ã‚½ãƒ¼ã‚¹ã¯æœ€é©åŒ–ã§LOVEãŒæ¶ˆãˆã¦ãŸã ã®ç„¡é™ãƒ«ãƒ¼ãƒ—ã«ãªã‚‹äº‘々ã¨ã„ã†è©±ãŒã‚ã£ãŸã®ã§æ¤œè¨¼ã€‚ http://togetter.com/li/144840 用æ„ã—ãŸã‚½ãƒ¼ã‚¹ã¯ã“ã¡ã‚‰ã€‚ int main() { int LOVE = 0; while(1){LOVE++;} } ãã‚Œã˜ã‚ƒã‚¢ã‚»ãƒ³ãƒ–ラを見ã¦ã¿ã¾ã—ょ。 ã¾ãšã¯æœ€é©åŒ–抜ã。 gcc -O0 -s hoge.c .file "hoge.c" .text .globl main .type main, @function main: pushl %ebp movl %esp, %ebp subl $16, %esp movl $0, -4(%ebp) ;LOVE=0 .L2: addl $1, -4(%ebp) ;LOVE++ jmp .L2 ;JUMP TO
GCCã®å„オプティマイズレベルã§æœ‰åŠ¹ã«ãªã‚‹æœ€é©åŒ–を調ã¹ã‚‹ - Shohei Yoshida's Diary
GCC 4.4ãらã„ã‹ã‚‰è¦‹ãŸã„ãªã®ã§ã™ãŒã€-Qオプションを使ã†ã¨ã€ 最é©åŒ–ç‰ã§ã©ã®ã‚ªãƒ—ションãŒæœ‰åŠ¹ã«ãªã‚‹ã‹ãŒã‚ã‹ã‚‹ã¿ãŸã„ã§ã™ã€‚ 具体的ã«ã¯ä»¥ä¸‹ã®ã‚ˆã†ãªã‚³ãƒžãƒ³ãƒ‰ã§ã™ã€‚ % gcc -O2 -Q --help=optimize # 個々ã®ã‚ªãƒ—ションã«ã¤ã„㦠'enabled' or 'disabled'ãŒç¢ºèªã§ãã‚‹ãã‚Œã§å„レベルã§ã®é•ã„を見ã¦ã¿ãŸã€‚ ã¾ã¨ã‚ã‚‹ã®ãŒé¢å€’ãªã®ã§ä»¥ä¸‹ã®ã‚ˆã†ãªã‚¹ã‚¯ãƒªãƒ—トを走らã›ã‚‹ #!/usr/bin/env perl use strict; use warnings; my @levels = qw(-O0 -O1 -O2 -O3 -Os); my @base = qw(gcc -- -Q --help=optimize); my %optimize; for my $level (@levels) { my @cmd = @base; $cmd[1] = $leve
ã¨ããŸã¾ã€ã‚ã‹ã‚生活…。: CentOS 5.5ã«gccをインストール
Qtをインストールã™ã‚‹éš›ã€libstdc++.so.6 ã« GLIBCXX_3.4.9ãŒç„¡ã„ã¨æ€’られãŸã®ã§ã€gccã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚’上ã’る。CentOSã«å…ƒã‹ã‚‰å…¥ã£ã¦ã„ã‚‹gccã¯å¤ã„。 動作環境 CentOS 5.5 gcc 4.5.2 gccをインストールã™ã‚‹ã«ã¯ã€gmpã€mpfrã€mpcã€pplã€libelfãŒå¿…è¦ã€‚ gmpã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« # wget ftp://ftp.gmplib.org/pub/gmp-5.0.1/gmp-5.0.1.tar.bz2 # tar xjvf gmp-5.0.1.tar.bz2 # cd gmp-5.0.1 # ./configure --enable-cxx # make # make check # make install pplをインストールã™ã‚‹ã«ã¯ã€gmpã§c++ãŒã‚µãƒãƒ¼ãƒˆã•ã‚Œã¦ã„ã‚‹å¿…è¦ãŒã‚る。 mpfrã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« # wget http:
彼女ã®å‹äººãŒGCCã®ä¸ã®äººã‹ã‚‰èžã„ãŸè©± - Yet Another Ranha
以下，エイプリルフールã®è¨˜äº‹ã¨ã—ã¦æ›¸ã„ãŸã‚‚ã®ãªã®ã§ç¾ä»£ã«ãŠã„ã¦èªã‚€ä¾¡å€¤ã¯ã‚ã‚Šã¾ã›ã‚“． ブãƒã‚°ã«ã¯åœ°éœ‡å¾Œåˆã‚ã¦è¨˜äº‹ã‚’書ã事ã«ãªã£ã¦ã€ç”Ÿå˜å ±å‘Šã¨ã—ã¦ã¯æ˜Žã‚‰ã‹ã«é…ã„ã§ã™ã…。ã§ã‚‚ã€twitterã§ã¯å…ƒæ°—ã«ã‚„ã£ã¦ã„ã¾ã—ãŸã€‚今ã¯å®Ÿå®¶ã«ã„ã¾ã™ã€‚ ã•ã¦ã€ã¤ã„先日æ±äº¬ã§è¨€èªžé›‘談会ã¨ã„ã†ã‚¤ãƒ™ãƒ³ãƒˆãŒã‚ã£ã¦ã€ãã®æŠ˜ã«ã¤ãã°ã®ãŠå®¶ã®ç¾çŠ¶ã‚’見ã¦æ¥ã¾ã—ãŸã€‚特別大変ãªäº‹ãŒèµ·ã“ã£ã¦ã„ãŸã‚ã‘ã§ã‚‚ãªã心底ホッã¨ã—ã¾ã—ãŸã€‚ ãã®ç¿Œæ—¥ã«ã¯ã€å½¼å¥³ã¨æ±äº¬ã¯æ–°å®¿ãƒãƒ«ãƒˆ9ã§ã‚µãƒ¨ãƒŠãƒ©ãƒŽãƒ„ãƒã‚µã‚’観ãŸã®ã§ã™ãŒã€ãã®æŠ˜ã«gcc-4.6( http://gcc.gnu.org/gcc-4.6/changes.html )ã®è©±ãŒã§ã¾ã—ãŸã€‚ gccã®è©±ãŒå‡ºãŸã®ã¯Cランゲッジã®è©±ã‚’ã—ã¦ã„ãŸã‹ã‚‰ãªã®ã§ã™ãŒã€sequence pointã‚’ã©ã†ã—ã¦å‰¯ä½œç”¨å®Œäº†ç‚¹ã¨è¨³ã—ãŸã®ã§ã—ょã†ã‹ã€ã¨ã‹ãã†ã„ã†ç–‘å•ãŒç™ºç«¯ã ã£ãŸæ°—ãŒã—ã¾ã™ã€‚ "副作用完了点"ã‚’èªè˜ã—ãŸäº‹ã®ç„¡ã„æ–¹
GCC-4.6ã® stack-usageを使ã£ã¦ã¿ãŸ - Shohei Yoshida's Diary
GCC 4.6 RC㌠3月14æ—¥ã«å‡ºã¾ã—ãŸã€‚ãªã‚“ã§ã‚‚ã†ã™ãæ£å¼ç‰ˆã‚‚出るã‹ã¨ æ€ã„ã¾ã™ã€‚Changlogを見ã¦ã„ã‚‹ã¨æ°—ã«ãªã‚‹æ©Ÿèƒ½ãŒã‚ã‚Šã¾ã—ãŸã€‚ãれ㌠stack-usage. 関数ã”ã¨ã®ã‚¹ã‚¿ãƒƒã‚¯ã®ä½¿ç”¨é‡ãŒç¢ºèªã§ãã‚‹ã¨ã„ã†ã‚‚ã®ã§ã™ã€‚ ã“れ㯠Adaã ã¨ã ã„ã¶å‰ã‹ã‚‰å®Ÿè£…ã•ã‚Œã¦ã„ãŸã‚“ã§ã™ã‘ã©ã€4.6ã‹ã‚‰ã¯ ã©ã®è¨€èªžã‹ã‚‰ã§ã‚‚利用ã™ã‚‹ã“ã¨ãŒã§ãã¾ã™ã€‚ 環境 Ubuntu 10.10 x64 GCC4.6ã®ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« GCC 4.5.1をビルドã™ã‚‹ - Life is very short GCC 4.5.2をビルドã™ã‚‹ - Life is very short ã¨åŒã˜ãªã®ã§ã€ã“れらã®è¨˜äº‹ã‚’å‚ç…§ã—ã¦ãã ã•ã„。 準備ã•ãˆã§ãã‚Œã°ä»¥ä¸‹ã®ã‚³ãƒžãƒ³ãƒ‰ã§ä½œæˆã§ãã¾ã™ã€‚ % tar xf archives/gcc-4.6.0-RC-20110314.tar.bz2 % cd gcc-4.6.0-RC-201103
ls -l ã®ã‚³ãƒ¼ãƒ«ã‚°ãƒ©ãƒ• - Shohei Yoshida's Diary
GCC-4.6ã® stack-usageを使ã£ã¦ã¿ãŸ - syohex’s diary ã¨ã‚³ãƒ¼ãƒ«ã‚°ãƒ©ãƒ•ã‚’組ã¿åˆã‚ã›ã¦ä½•ã‹ã§ããªã„ã‹ãªã£ã¦æ€ã£ãŸã‚“ã ã‘ã©ã€ 今ã®ã¨ã“ã‚何もã§ãã¾ã›ã‚“ã§ã—ãŸã€‚コールグラフã®å›³ã ã‘作ã£ãŸã®ã§ 勿体ãªã„ã®ã§è²¼ã£ã¦ãŠãã¾ã™ã€‚ 環境 Ubuntu 10.10 x86_64 ソース coreutils-8.10を使ã„ã¾ã—ãŸã€‚ ソース㯠src/{ls.c,ls-ls.c}ã§ã™ã€‚ 作り方 一旦coreutilsを作æˆã—ã¦ã‚ã¨ã§å€‹åˆ¥ã«ã‚³ãƒ³ãƒ‘イルã—ã¾ã™ã€‚ make時ã«è‡ªå‹•ç”Ÿæˆã™ã‚‹ãƒ•ã‚¡ã‚¤ãƒ«ãŒã‚ã‚Šã€lsã®ã‚½ãƒ¼ã‚¹ã ã‘ã§ã¯ ビルドã§ããªã„ãŸã‚ã§ã™ã€‚ % ./configure % make % cd src % gcc -std=c99 -g -pg -O2 -I. -fstack-usage -I../lib \ ls.c ls-ls.c ../lib/libcoreutils.a
gccを使ã£ã¦ã‚³ãƒ³ãƒ†ã‚¹ãƒˆã«å‡ºã‚‹ - komiyamã®æ—¥è¨˜
大抵ã®ãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚°ã‚³ãƒ³ãƒ†ã‚¹ãƒˆã‚„オンラインジャッジã§ã¯C/C++ãŒé¸æŠžã§ãる。ã—ã‹ã‚‚大体gccã§ã‚ã‚‹(ã‚‚ã—ãã¯ã€é¸ã¹ã‚‹)ã“ã¨ãŒå¤šã„。ãªã®ã§ã€gccã§æ›¸ãã¨ãã«è¦šãˆã¦ãŠãã¨ä¾¿åˆ©ã€ã‹ã‚‚ã—ã‚Œãªã„ã“ã¨ã‚’書ã„ã¦ãŠã。ãã‚‚ãã‚‚gccã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚„コンパイルオプションã«ã‚ˆã£ã¦ã¯ã‚³ãƒ³ãƒ‘イルã§ããªã‹ã£ãŸã‚Šã™ã‚‹å¯èƒ½æ€§ã‚‚ã‚ã‚‹ã®ã§ç©æ¥µçš„ã«ä½¿ã†ã‚‚ã®ã§ã‚‚ãªã„ã¨æ€ã†ã‘ã©ã€‚ 関数 algorithmã‚’includeã—ãŸã¨ãã«__gcdãŒä½¿ãˆã‚‹ã®ã¯ã‹ãªã‚Šå½¹ç«‹ã¤ã€‚ãŸã ã—ã€long longã§ã¯å‹•ã„ãŸã‚Šå‹•ã‹ãªã‹ã£ãŸã‚Šã™ã‚‹æ§˜ã (個人的ãªçµŒé¨“ã§ã¯å‹•ãã“ã¨ãŒå¤šã„よã†ãª)。 stdio.hã‚„string.hã‚„math.hã«å…¥ã£ã¦ã‚‹å¤§éƒ¨åˆ†(自分ãŒæŠŠæ¡ã§ãã¦ã‚‹åˆ†ã«ã¤ã„ã¦ã¯å…¨éƒ¨)ã®é–¢æ•°ãŒã€__builtin_ã‚’å…ˆé ã«ä»˜ã‘ã‚‹ã¨includeã›ãšã«ä½¿ãˆã‚‹(__builtin_printfã¨ã‹)。 上ã«æŒ™ã’ãŸã®ã¯å˜ã«includeã™ã‚Œã°ã„ã„ã ã‘ãª
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void* memset64(void* d, uint64_t i, int n) { asm("cld; rep stosq;" :: "D"(d), "a"(i), "c"(n) : "memory"); return d; } 最近㮠CPU ã¯ã‚¯ã‚½è³¢ã„。ãã®ãŸã‚ã€ä¸‹æ‰‹ã«æ‰‹ã§ loop unrolling ã™ã‚‹ã‚ˆã‚Šã‚‚ã€é€†ã« CPU ã«ã€Œã“ã“ã¯ãƒ«ãƒ¼ãƒ—ãªã‚“ã ãžãŠãŠãŠï½žã€ã¨ã„ã†ã®ã‚’明示的ã«æŒ‡ç¤ºã—ã¦ã‚ã’ãŸã»ã†ãŒ CPU å´ãŒå‹æ‰‹ã‹ã¤ä¸æ°—味ã«æœ€é©ãªæŒ™å‹•ã‚’示ã—ã‚„ãŒã‚‹ã€‚ãã†ã„ã†æ„味ã§ã¯ç¾ä»£ã¯ã‚る種㮠CISC ルãƒã‚µãƒ³ã‚¹ã¨ã‚ˆã¹ã‚‹æ™‚期ã§ã¯ã‚ã‚‹ã®ã ã‚ã†( 10 年後ã¯ã‚ã‹ã‚‰ã‚“ãŒ)。
Compilers status: Visual C++, GCC and LLVM (updated)
25/01/2011 Compilers status: Visual C++, GCC and LLVM (updated)RSS Feed ~ Comment: by email - on Twitter ~ Share: Twitter - Facebook - Linked In - Google+ - Permanent link For this follow up of my previous post, I decided to use my project Ovt'sa, a simple CPU raytracer, including Visual C++, GCC but also LLVM, using GCC 4.2 front-end. Ovt'sa is a pure C++ program but not especially effective for
Cã®ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯é–¢æ•°ã‚’C++ã®ãƒ¡ãƒ³ãƒé–¢æ•°ã«ãƒã‚¤ãƒ³ãƒ‡ã‚£ãƒ³ã‚°ã™ã‚‹æ–¹æ³• - kazuhoã®ãƒ¡ãƒ¢ç½®ãå ´
ãŸã¨ãˆã° libevent ã®ã‚ˆã†ãª C 言語ã§ã‹ã‹ã‚ŒãŸã‚¤ãƒ™ãƒ³ãƒˆé§†å‹•åž‹ã®ãƒ©ã‚¤ãƒ–ラリを C++ ã‹ã‚‰ä½¿ã£ã¦ã„ã‚‹ã¨ã€C++ ã®ãƒ¡ãƒ³ãƒé–¢æ•°ã‚’コールãƒãƒƒã‚¯ã¨ã—ã¦ã‚»ãƒƒãƒˆã§ããŸã‚‰ã†ã‚Œã—ã„ã“ã¨ãŒå¤šã„ã§ã™ã‚ˆã。以下ã®ã‚ˆã†ã«ã™ã‚Œã°ã§ãã¾ã™ã€‚ ãŸã¨ãˆã°ã€ã‚³ãƒ¼ãƒ«ãƒãƒƒã‚¯é–¢æ•°ã‚’セットã™ã‚‹é–¢æ•°ã®åž‹ãŒã€ void set_foo_callback(void (*)(void* cb_arg), void* cb_arg); ãªã‚‰ã€ä»¥ä¸‹ã®ã‚ˆã†ã«ã‚¯ãƒ©ã‚¹ã¨ãƒ¡ãƒ³ãƒé–¢æ•°ã‚’引数ã«ã¨ã‚‹ãƒ†ãƒ³ãƒ—レート関数を定義ã—〠template <typename T, void (T::*FUNC)()> void to_foo_callback(void* cb_arg) { T* obj = reinterpret_cast<T*>(cb_arg); (obj->*FUNC)(); }以下ã®ã‚ˆã†ã«å—ã‘渡ã›ã°ã„ã„。 class K { publ
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linux2.6.34ã®switch_to()を見ã¦ãŸã‚‰ã€ã‚¤ãƒ³ãƒ©ã‚¤ãƒ³ã‚¢ã‚»ãƒ³ãƒ–ラã§è¦‹æ…£ã‚Œãªã„記述ãŒã‚ã£ãŸã®ã§ã€ã¡ã‚‡ã£ã¨ç¢ºèªã—ã¦ã¿ãŸã€‚ test1()ã¯é€šå¸¸é€šã‚Šã«0番目ã€1番目ã£ã¦æ„Ÿã˜ã§å¤‰æ•°ã‚’使ã£ã¦ã‚‹ãƒ‘ターンã§ã€test2()ã¯åå‰ã‚’付ã‘ã¦ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹æ–¹æ³•ã€‚ã“ã‚“ãªã‚„ã‚Šæ–¹ã£ã¦å‰ã‹ã‚‰ã‚ã£ãŸã£ã‘？ ã¾ãã€åå‰ã‚’ã¤ã‘れる方ãŒåˆ†ã‹ã‚Šã‚„ã™ãã¦è‰¯ã„ã®ã§ã™ãŒã€‚ #include <iostream> using namespace std; void test1(int src) { int dest = 0; __asm__ __volatile__("mov %0, %1;\n\t" :"=r"(dest) :"r"(src) ); cout << "dest is " << dest << " : src is << " << src << endl; } void test2(int src) { i
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