{"id":16376,"date":"2022-10-15T10:29:53","date_gmt":"2022-10-15T04:59:53","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-should-all-code-compiled-for-32-bit-machines-be-in-4-byte-chunks\/"},"modified":"2022-10-15T10:29:53","modified_gmt":"2022-10-15T04:59:53","slug":"solved-should-all-code-compiled-for-32-bit-machines-be-in-4-byte-chunks","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-should-all-code-compiled-for-32-bit-machines-be-in-4-byte-chunks\/","title":{"rendered":"[Solved] Should all code compiled for 32 bit machines be in 4 byte chunks?"},"content":{"rendered":"

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Instruction size does not<\/strong> related to data or address bus size. Some 16-bit x86 CPUs have 3 totally different sizes with 8-bit data bus, 20-bit address bus and variable length instruction<\/em> size. Modern 32-bit or 64-bit x86 have variable length instruction too for backward compatibility.<\/p>\n

Just look at the movl $0x542412e6, %eax<\/code> and pushl 0x08048dd6<\/code> line and you’ll see that it’s impossible to encode 32-bit immediate data, opcode and register within 32 bits of data. If an architecture uses 32-bit fixed-length<\/em> instruction then it must use multiple instructions or a literal pool to load 32-bit constant.<\/p>\n

RISC architectures often have fixed width instructions as a trade-off between code density<\/strong> and decoder simplicity<\/strong>. But 32-bit RISC architectures with instruction size different from 32-bit also exist. For example MIPS16e and ARM thumb v1 have 16-bit instructions whereas ARM thumb2 and dalvikVM have variable length instructions. Modern 64-bit RISC architectures also won’t have 64-bit instructions but rather often stick with the 32-bit size<\/p>\n<\/p><\/div>\n

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solved Should all code compiled for 32 bit machines be in 4 byte chunks? <\/p>\n","protected":false},"excerpt":{"rendered":"

[ad_1] Instruction size does not related to data or address bus size. Some 16-bit x86 CPUs have 3 totally different sizes with 8-bit data bus, 20-bit address bus and variable length instruction size. Modern 32-bit or 64-bit x86 have variable length instruction too for backward compatibility. Just look at the movl $0x542412e6, %eax and pushl … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[465,608,4162,523],"class_list":["post-16376","post","type-post","status-publish","format-standard","hentry","category-solved","tag-assembly","tag-gcc","tag-instructions","tag-x86"],"yoast_head":"\n[Solved] Should all code compiled for 32 bit machines be in 4 byte chunks? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-should-all-code-compiled-for-32-bit-machines-be-in-4-byte-chunks\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Should all code compiled for 32 bit machines be in 4 byte chunks? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Instruction size does not related to data or address bus size. 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