[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-639032-105":59,"doc-detail-639032-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","design-alternatives-for-barrel-shifters-abstract","Design alternatives for barrel shifters - abstract","","Barrel shifters are widely used in embedded digital signal processors and general-purpose processors to manipulate data. The paper studies design alternatives for barrel shifters implementing shift right logical, shift right arithmetic, rotate right, shift left logical, shift left arithmetic, and rotate left. Four designs are compared by area and delay across operand sizes, and methods are proposed to detect overflow and zero results in parallel with shifting or rotating. Java programs generate structural VHDL models and synthesis results show improved area and delay for data-reversal and mask-based data-reversal designs.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/design-alternatives-for-barrel-shifters-abstract/639032/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/design-alternatives-for-barrel-shifters-abstract/639032.png","ImageObject",300,407,{"name":92,"@type":93},"Dewi_Sukmawati","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-10-22",true,{"@type":102,"interactionType":103,"userInteractionCount":8},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What operations do the barrel shifters in this paper support?","Question",{"text":112,"@type":113},"They support shift right logical, shift right arithmetic, rotate right, shift left logical, shift left arithmetic, and rotate left.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How are the four barrel shifter designs evaluated?",{"text":117,"@type":113},"They are compared in terms of area and delay across a variety of operand sizes, using synthesis results from structural VHDL models.",{"name":119,"@type":110,"acceptedAnswer":120},"How does the paper handle overflow and zero detection?",{"text":121,"@type":113},"It proposes techniques to detect overflow and zero results in parallel with the shift or rotate operation, and highlights mask-based data-reversal approaches as especially suitable when such detection is required.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},639032,1792701255,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":41},962094243415,"https://ap-avatar.wpscdn.com/davatar_3d24733baf745e90a7e4bdd5f77d97b2","Design alternatives for barrel shifters  \nMatthew R. Pillmeier  \nRushmore Processor 2  \nUnisys Corporation  \nBlue Bell, PA 19424  \nMichael J. Schulte and E. George Walters III  \nComputer Architecture and Arithmetic Laboratory  \nComputer Science and Engineering Department  \nLehigh University  \nBethlehem, PA 18015, USA  \nABSTRACT  \nBarrel shifters are often utilized by embedded digital signal processors and general-purpose processors to manipulate data. This paper examines design alternatives for barrel shifters that perform the following functions: shift right logical, shift right arithmetic, rotate right, shift left logical, shift left arithmetic, and rotate left. Four di􀀋erent barrel shifter designs are presented and compared in terms of area and delay for a variety of operand sizes. This paper also examines techniques for detecting results that over􀀍ow and results of zero in parallel with the shift or rotate operation. Several Java programs are developed to generate structural VHDL models for each of the barrel shifters. Synthesis results show that data-reversal barrel shifters have less area and mask  \nbased data-reversal barrel shifters have less delay than other designs. Mask-based data-reversal barrel shifters are especially attractive when over􀀍ow and zero detection is also required, since the detection is performed in parallel with the shift or rotate operation.  \nKeywords: barrel shifters, rotators, masks, data-reversal, over􀀍ow detection, zero 􀀍ag, computer arithmetic.  \n1. INTRODUCTION  \nShifting and rotating data is required in several applications including arithmetic operations, variable-length coding, and bit-indexing. Consequently, barrel shifters, which are capable of shifting or rotating data in a single cycle, are commonly found in both digital signal processors and general-purpose processors. Several patents [1{ 10] and research articles [11{15] have been written on e􀀎cient designs and implementations for barrel shifters. In [16], several 32-bit barrel shifters are compared in terms of delay, power, and power-delay product.  \nThis paper examines design alternatives for barrel shifters that perform the following operations: shift right logical, shift right arithmetic, rotate right, shift left logical, shift left arithmetic, and rotate left. These designs are optimized to share hardware for di􀀋erent operations. Techniques are also presented for detecting results that over􀀍ow and results of zero in parallel with the shift or rotate operation. Section 2 describes the basic shift and rotate operations and gives examples of each operation. Section 3 presents designs for several types of barrel shifters. Section 4 gives area and delay estimates for each type of barrel shifter as the operand size varies. Section 5 presents conclusions. Further details on the designs presented in this paper are given in [17] .  \n2. SHIFT AND ROTATE OPERATIONS  \nIn this paper, we de􀀌ne A to be the input operand, B to be the shift/rotate amount, and Y to be the shifted/rotated result. We de􀀌ne A to be an n-bit value, where n is an integer power of two. Therefore, B is a log2 ( n)-bit integer representing values from 0 to n 􀀀 1. The barrel shifters presented in this paper perform the following six operations: shift right logical, shift right arithmetic, rotate right, shift left logical,  \nshift left arithmetic, and rotate left. Table 1 gives an example for each of these operations. In this table, the bit vector for A is denoted as a7 a6 a5 a4 a3 a2 a1 a0 and the shift/rotate amount, B , is 3 bits. As illustrated in this table:  \n\n| Operation | Y |\n| --- | --- |\n| 3-bit shift right logical | 0 0 0 a7a6a5a4 a3 |\n| 3-bit shift right arithmetic | a7 a7 a7 a7 a6 a5 a4 a3 |\n| 3-bit rotate right | a2 a1 a0 a7 a6 a5 a4 a3 |\n| 3-bit shift left logical | a4a3a2 a1 a0 0 0 0 |\n| 3-bit shift left arithmetic | a7a3a2 a1 a0 0 0 0 |\n| 3-bit rotate left | a4 a3 a2 a1 a0 a7 a6 a5 |\n\nTable 1 . Shift and rotate examples for A = a7a6a5 a4a3a2 a1 a0 and B =","cbCaikxcM7RZioKe","https://ap.wps.com/l/cbCaikxcM7RZioKe","pdf",474021,12,"English","# Introduction\n## Shift and rotate operations\n# Barrel shifter designs","[{\"question\":\"What operations do the barrel shifters in this paper support?\",\"answer\":\"They support shift right logical, shift right arithmetic, rotate right, shift left logical, shift left arithmetic, and rotate left.\"},{\"question\":\"How are the four barrel shifter designs evaluated?\",\"answer\":\"They are compared in terms of area and delay across a variety of operand sizes, using synthesis results from structural VHDL models.\"},{\"question\":\"How does the paper handle overflow and zero detection?\",\"answer\":\"It proposes techniques to detect overflow and zero results in parallel with the shift or rotate operation, and highlights mask-based data-reversal approaches as especially suitable when such detection is required.\"}]","Design alternatives for barrel shifters - abstract | PDF"]