{"id":240,"date":"2006-04-04T18:07:08","date_gmt":"2006-04-05T01:07:08","guid":{"rendered":"http:\/\/multimedia.cx\/eggs\/?p=240"},"modified":"2006-04-04T18:09:19","modified_gmt":"2006-04-05T01:09:19","slug":"4-additions-are-faster-than-1","status":"publish","type":"post","link":"https:\/\/multimedia.cx\/eggs\/4-additions-are-faster-than-1\/","title":{"rendered":"4 Additions Are Faster Than 1?"},"content":{"rendered":"<p>Today&#8217;s wacky ASM construct shows us four sequential additions to the same register:<\/p>\n<pre>\r\n  add ecx, 00000004\r\n  add ecx, 00000004\r\n  add ecx, 00000004\r\n  add ecx, 00000004\r\n<\/pre>\n<p>Does this have some great advantage over, say:<\/p>\n<pre>\r\n  add ecx, 00000010\r\n<\/pre>\n<p>Who knows? But I dare you to claim that this is some compiler optimization technique. You can&#8217;t claim that it&#8217;s minimizing branch prediction error this time since there are no branches to be seen for miles (kilometers, if you must) on either side. In fact, here is a little ASM context on either side of the block:<\/p>\n<pre>\r\n  xor ebx, ebx\r\n  mov bl, byte[esp+26]\r\n  add ecx, 00000004\r\n  add ecx, 00000004\r\n  add ecx, 00000004\r\n  add ecx, 00000004\r\n  mov ebx, dword[esi+4*ebx]\r\n<\/pre>\n<p>Hmm, now that I look at it after an indignant rant, I realize that maybe the compiler decided to delay after a byte is loaded from memory before accessing memory again.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>More ASM nuttiness&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-240","post","type-post","status-publish","format-standard","hentry","category-reverse-engineering"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"More ASM nuttiness...\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Multimedia Mike\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/multimedia.cx\/eggs\/4-additions-are-faster-than-1\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Breaking Eggs And Making Omelettes | Topics On Multimedia Technology and Reverse Engineering\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"4 Additions Are Faster Than 1? 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