{"id":7478,"date":"2020-03-26T21:54:54","date_gmt":"2020-03-26T12:54:54","guid":{"rendered":"http:\/\/umezawa.dyndns.info\/wordpress\/?p=7478"},"modified":"2020-03-26T21:55:16","modified_gmt":"2020-03-26T12:55:16","slug":"zen-%e3%81%af-pext-pdep-%e5%91%bd%e4%bb%a4%e3%81%8c%e9%81%85%e3%81%84","status":"publish","type":"post","link":"http:\/\/umezawa.dyndns.info\/wordpress\/?p=7478","title":{"rendered":"Zen \u306f PEXT\/PDEP \u547d\u4ee4\u304c\u9045\u3044"},"content":{"rendered":"<p>BMI2 (Bit Manipulation Instructions 2) \u306b\u306f PEXT\/PDEP \u3068\u3044\u3046\u547d\u4ee4\u304c\u3042\u3063\u3066\u300132\/64 \u30d3\u30c3\u30c8\u5024\u306e\u4e2d\u304b\u3089\u6307\u5b9a\u3057\u305f\u30d3\u30c3\u30c8\u7fa4\u3092\u53d6\u3063\u3066\u304d\u3066\u4e0b\u306b\u8a70\u3081\u3066\u53d6\u5f97\u3059\u308b\u3001\u3068\u3044\u3046\u51e6\u7406\uff08\u3068\u305d\u306e\u9006\uff09\u304c1\u547d\u4ee4\u3067\u3067\u304d\u307e\u3059\u3002Intel \u3060\u3068 Haswell \u4ee5\u964d\u3067\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<p><!--more--><\/p>\n<p>\u3055\u3066\u3001AMD \u306e Zen \u30de\u30a4\u30af\u30ed\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\uff08Zen+, Zen2 \u3082\u542b\u3080\uff09\u306f AVX2 \u306e\u4ed6\u306b BMI1\/2 \u3082\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u308f\u3051\u3067\u3059\u304c\u3001\u3053\u306e PEXT\/PDEP \u547d\u4ee4\u306f\u30de\u30a4\u30af\u30ed\u30b3\u30fc\u30c9\u5b9f\u88c5\u3068\u306a\u3063\u3066\u304a\u308a\u3001\u3057\u304b\u3082\u3082\u306e\u3059\u3054\u304f\u5b9f\u884c\u304c\u9045\u3044\u3067\u3059\u3002 Intel \u3060\u3068\u30ec\u30a4\u30c6\u30f3\u30b73\u30b9\u30eb\u30fc\u30d7\u30c3\u30c81\u3067\u3059\u304c\u3001Zen \u3060\u3068\u7b2c2\u30aa\u30da\u30e9\u30f3\u30c9\u3067\u7acb\u3063\u3066\u3044\u308b\u30d3\u30c3\u30c8\u306e\u6570\uff08=\u53d6\u3063\u3066\u304f\u308b\u30d3\u30c3\u30c8\u306e\u6570\uff09\u306b\u4f9d\u5b58\u3057\u3066\u9045\u304f\u306a\u308a\u300164bit \u7248\u3067\u5168\u90e8\u30bc\u30ed\u3067\u308218\u30af\u30ed\u30c3\u30af\u300164bit \u5168\u90e8\u7acb\u3063\u3066\u308b\u3068200\u30af\u30ed\u30c3\u30af\u3092\u4f59\u88d5\u3067\u8d85\u3048\u307e\u3059\u3002\u4fbf\u5229\u547d\u4ee4\u306a\u3093\u3067\u3059\u3051\u3069\u3002<\/p>\n<blockquote class=\"twitter-tweet\">\n<p lang=\"en\" dir=\"ltr\">Achilles heel of <a href=\"https:\/\/twitter.com\/hashtag\/AMD?src=hash&amp;ref_src=twsrc%5Etfw\">#AMD<\/a> Zens: data dependency of PDEP\/PEXT instructions. For every BMI2-capable <a href=\"https:\/\/twitter.com\/hashtag\/Intel?src=hash&amp;ref_src=twsrc%5Etfw\">#Intel<\/a> all values are 1. <a href=\"https:\/\/t.co\/mtdIXByoj2\">pic.twitter.com\/mtdIXByoj2<\/a><\/p>\n<p>&mdash; InstLatX64 (@InstLatX64) <a href=\"https:\/\/twitter.com\/InstLatX64\/status\/1209095219087585281?ref_src=twsrc%5Etfw\">December 23, 2019<\/a><\/p><\/blockquote>\n<p> <script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script> <\/p>\n<p>\u3082\u3063\u3068\u3082\u3001\u3053\u308c\u3060\u3051\u8907\u96d1\u306a\u51e6\u7406\u3092\u3059\u308b\u547d\u4ee4\u304c\u30ec\u30a4\u30c6\u30f3\u30b73\u30b9\u30eb\u30fc\u30d7\u30c3\u30c81\u3067\u5b9f\u884c\u3067\u304d\u308b\u3068\u3044\u3046\u3053\u3068\u306e\u65b9\u304c\u30d3\u30c3\u30af\u30ea\u3067\u3042\u308b\u3001\u3068\u3044\u3046\u8a71\u306f\u3042\u308a\u307e\u3059\u3002\u3069\u3093\u306a\u56de\u8def\u7d44\u3093\u3067\u308b\u3093\u3060\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"<p>BMI2 (Bit Manipulation Instructions 2) \u306b\u306f PEXT\/PDEP \u3068\u3044\u3046\u547d\u4ee4\u304c\u3042\u3063\u3066\u300132\/64 \u30d3\u30c3\u30c8\u5024\u306e\u4e2d\u304b\u3089\u6307\u5b9a\u3057\u305f\u30d3\u30c3\u30c8\u7fa4\u3092\u53d6\u3063\u3066\u304d\u3066\u4e0b\u306b\u8a70\u3081\u3066\u53d6\u5f97\u3059\u308b\u3001\u3068\u3044\u3046\u51e6\u7406\uff08\u3068\u305d\u306e\u9006 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-7478","post","type-post","status-publish","format-standard","hentry","category-technology"],"_links":{"self":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7478","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7478"}],"version-history":[{"count":4,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7478\/revisions"}],"predecessor-version":[{"id":7494,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/7478\/revisions\/7494"}],"wp:attachment":[{"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7478"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7478"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/umezawa.dyndns.info\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7478"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}