{"id":41583,"date":"2003-12-08T10:00:00","date_gmt":"2003-12-08T10:00:00","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/oldnewthing\/2003\/12\/08\/if-flushinstructioncache-doesnt-do-anything-why-do-you-have-to-call-it\/"},"modified":"2003-12-08T10:00:00","modified_gmt":"2003-12-08T10:00:00","slug":"if-flushinstructioncache-doesnt-do-anything-why-do-you-have-to-call-it","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/oldnewthing\/20031208-00\/?p=41583","title":{"rendered":"If FlushInstructionCache doesn&#039;t do anything, why do you have to call it?"},"content":{"rendered":"<p> If you look at the implementation of FlushInstructionCache on Windows 95, you&#8217;ll see that it&#8217;s just a return instruction. It doesn&#8217;t actually do anything. So why do you have to call it? <\/p>\n<p> Because the act of calling it is the whole point. The control transfers implicit in calling a function suffice to flush the instruction cache on a Pentium. The function doesn&#8217;t have to do anything else; it is fact that you called a function that is important. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you look at the implementation of FlushInstructionCache on Windows 95, you&#8217;ll see that it&#8217;s just a return instruction. It doesn&#8217;t actually do anything. So why do you have to call it? Because the act of calling it is the whole point. The control transfers implicit in calling a function suffice to flush the instruction [&hellip;]<\/p>\n","protected":false},"author":1069,"featured_media":111744,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[2],"class_list":["post-41583","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-history"],"acf":[],"blog_post_summary":"<p>If you look at the implementation of FlushInstructionCache on Windows 95, you&#8217;ll see that it&#8217;s just a return instruction. It doesn&#8217;t actually do anything. So why do you have to call it? Because the act of calling it is the whole point. The control transfers implicit in calling a function suffice to flush the instruction [&hellip;]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/41583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/users\/1069"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/comments?post=41583"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/41583\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media\/111744"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media?parent=41583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=41583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=41583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}