{"id":193119,"date":"2025-02-19T05:19:33","date_gmt":"2025-02-19T05:19:33","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=193119"},"modified":"2025-02-19T05:19:36","modified_gmt":"2025-02-19T05:19:36","slug":"the-machine-code-of-legv8-instruction-sub-x15x16x17-in-hexadecimal-is","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/19\/the-machine-code-of-legv8-instruction-sub-x15x16x17-in-hexadecimal-is\/","title":{"rendered":"The machine code of LEGv8 instruction SUB X15,X16,X17 in hexadecimal is"},"content":{"rendered":"\n<p>The machine code of LEGv8 instruction SUB X15,X16,X17 in hexadecimal is?<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>The LEGv8 instruction <code>SUB X15, X16, X17<\/code> performs a subtraction of the values stored in registers <code>X16<\/code> and <code>X17<\/code> and stores the result in register <code>X15<\/code>. In this instruction, <code>SUB<\/code> stands for subtract, <code>X15<\/code> is the destination register, <code>X16<\/code> is the first operand, and <code>X17<\/code> is the second operand.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Steps to Determine the Machine Code in Hexadecimal<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Opcode and Format:<\/strong><br>The <code>SUB<\/code> instruction in LEGv8 follows the <strong>Arithmetic<\/strong> format and is classified under the <strong>R-type<\/strong> instructions. The general format for R-type instructions in LEGv8 is:<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   | opcode (6 bits) | Rn (5 bits) | Rm (5 bits) | shamt (6 bits) | funct3 (3 bits) | Rd (5 bits) | funct7 (7 bits) |<\/code><\/pre>\n\n\n\n<p>In this case, <code>SUB<\/code> is an operation that subtracts, so we need to use the <code>funct3<\/code> and <code>funct7<\/code> values associated with subtraction in the LEGv8 instruction set.<\/p>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>Opcode for <code>SUB<\/code>:<\/strong><br>The opcode for arithmetic instructions (including subtraction) is <code>0100011<\/code>.<\/li>\n\n\n\n<li><strong>Register and Immediate Values:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>Rd = X15<\/code> = register number <code>15<\/code> \u2192 binary <code>01111<\/code><\/li>\n\n\n\n<li><code>Rn = X16<\/code> = register number <code>16<\/code> \u2192 binary <code>10000<\/code><\/li>\n\n\n\n<li><code>Rm = X17<\/code> = register number <code>17<\/code> \u2192 binary <code>10001<\/code><\/li>\n<\/ul>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>Function Codes:<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>funct3<\/code> for subtraction (<code>SUB<\/code>) is <code>000<\/code>.<\/li>\n\n\n\n<li><code>funct7<\/code> for subtraction is <code>0100000<\/code>.<\/li>\n<\/ul>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>Construct the Machine Code:<\/strong><br>Putting all the fields together:<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   | opcode (6 bits) | Rn (5 bits) | Rm (5 bits) | shamt (6 bits) | funct3 (3 bits) | Rd (5 bits) | funct7 (7 bits) |\n   | 0100011         | 10000       | 10001       | 000000         | 000             | 01111       | 0100000         |<\/code><\/pre>\n\n\n\n<p>This gives us the binary machine code for the instruction.<\/p>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li><strong>Final Hexadecimal Representation:<\/strong><br>The resulting binary instruction <code>0100011 10000 10001 000000 000 01111 0100000<\/code> is:<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   0x8A0113F3<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Final Answer:<\/h3>\n\n\n\n<p>The machine code of the <code>SUB X15, X16, X17<\/code> instruction in hexadecimal is <strong><code>0x8A0113F3<\/code><\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>This breakdown of the LEGv8 instruction illustrates how the binary fields for the opcode, registers, function codes, and other components are structured according to the R-type format for the <code>SUB<\/code> instruction. This method ensures that the operation is correctly executed by the processor when the program is run.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The machine code of LEGv8 instruction SUB X15,X16,X17 in hexadecimal is? The Correct Answer and Explanation is : The LEGv8 instruction SUB X15, X16, X17 performs a subtraction of the values stored in registers X16 and X17 and stores the result in register X15. In this instruction, SUB stands for subtract, X15 is the destination [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-193119","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/193119","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=193119"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/193119\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=193119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=193119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=193119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}